diff --git a/404.html b/404.html index 915f353..6c2e9b0 100644 --- a/404.html +++ b/404.html @@ -2,7 +2,7 @@ - + Page Not Found | mf @@ -14,8 +14,8 @@ - - + +
Skip to main content

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Please contact the owner of the site that linked you to the original URL and let them know their link is broken.

diff --git a/algorithms/algorithms-correctness/postcondition-ambiguity/index.html b/algorithms/algorithms-correctness/postcondition-ambiguity/index.html index 1bde907..d8b8044 100644 --- a/algorithms/algorithms-correctness/postcondition-ambiguity/index.html +++ b/algorithms/algorithms-correctness/postcondition-ambiguity/index.html @@ -2,7 +2,7 @@ - + Vague postconditions and proving correctness of algorithms | mf @@ -16,8 +16,8 @@ - - + +
Skip to main content

Vague postconditions and proving correctness of algorithms

Introduction​

diff --git a/algorithms/category/algorithms-and-correctness/index.html b/algorithms/category/algorithms-and-correctness/index.html index f4121da..ba4cecf 100644 --- a/algorithms/category/algorithms-and-correctness/index.html +++ b/algorithms/category/algorithms-and-correctness/index.html @@ -2,7 +2,7 @@ - + Algorithms and Correctness | mf - - + +

Algorithms and Correctness

Materials related to basic ideas behind algorithms and proofs of their diff --git a/algorithms/category/asymptotic-notation-and-time-complexity/index.html b/algorithms/category/asymptotic-notation-and-time-complexity/index.html index 0719d32..4f050f4 100644 --- a/algorithms/category/asymptotic-notation-and-time-complexity/index.html +++ b/algorithms/category/asymptotic-notation-and-time-complexity/index.html @@ -2,7 +2,7 @@ - + Asymptotic Notation and Time Complexity | mf @@ -16,8 +16,8 @@ - - + +

Asymptotic Notation and Time Complexity

Materials related to asymptotic notation and time complexity. diff --git a/algorithms/category/graphs/index.html b/algorithms/category/graphs/index.html index e88389c..e76d81b 100644 --- a/algorithms/category/graphs/index.html +++ b/algorithms/category/graphs/index.html @@ -2,7 +2,7 @@ - + Graphs | mf @@ -16,8 +16,8 @@ - - + +

Graphs

Materials related to basic graph algorithms and graph problems. diff --git a/algorithms/category/hash-tables/index.html b/algorithms/category/hash-tables/index.html index 0d9b51c..09de777 100644 --- a/algorithms/category/hash-tables/index.html +++ b/algorithms/category/hash-tables/index.html @@ -2,7 +2,7 @@ - + Hash Tables | mf @@ -16,8 +16,8 @@ - - + +

Hash Tables

Materials related to hash tables. diff --git a/algorithms/category/paths-in-graphs/index.html b/algorithms/category/paths-in-graphs/index.html index 6b72df4..ac0d488 100644 --- a/algorithms/category/paths-in-graphs/index.html +++ b/algorithms/category/paths-in-graphs/index.html @@ -2,7 +2,7 @@ - + Paths in Graphs | mf @@ -16,8 +16,8 @@ - - + +

Paths in Graphs

Materials related to finding paths in graphs. diff --git a/algorithms/category/recursion/index.html b/algorithms/category/recursion/index.html index 52d0958..5ecbe0a 100644 --- a/algorithms/category/recursion/index.html +++ b/algorithms/category/recursion/index.html @@ -2,7 +2,7 @@ - + Recursion | mf @@ -16,8 +16,8 @@ - - + +

Recursion

Materials related to recursive algorithms and their time complexity. diff --git a/algorithms/category/red-black-trees/index.html b/algorithms/category/red-black-trees/index.html index 6eb02c9..479b1c1 100644 --- a/algorithms/category/red-black-trees/index.html +++ b/algorithms/category/red-black-trees/index.html @@ -2,7 +2,7 @@ - + Red-Black Trees | mf @@ -16,8 +16,8 @@ - - + +

Red-Black Trees

Materials related to red-black trees. diff --git a/algorithms/graphs/bfs-tree/index.html b/algorithms/graphs/bfs-tree/index.html index 29dc08b..5bdb394 100644 --- a/algorithms/graphs/bfs-tree/index.html +++ b/algorithms/graphs/bfs-tree/index.html @@ -2,7 +2,7 @@ - + Distance boundaries from BFS tree on undirected graphs | mf @@ -16,8 +16,8 @@ - - + +

Distance boundaries from BFS tree on undirected graphs

Introduction​

@@ -28,11 +28,11 @@

Lower bound​

Consider the following graph:

-

-

+

+

We run BFS from the vertex aa and obtain the following BFS tree:

-

-

+

+

Let's consider pair of vertices ee and hh. For them we can safely lay, from the BFS tree, following properties:

  • lower bound: 22
    • @@ -42,12 +42,12 @@

    Proof by contradiction​

    Let's keep the same graph, but break the lower bound, i.e. I have gotten a lower bound 22, but “there must be a shorter path”! ;)

    Now the more important question, is there a shorter path in that graph? The answer is no, there's no shorter path than the one with length 22. So what can we do about it? We'll add an edge to have a shorter path. Now we have gotten a lower bound of 22, which means the only shorter path we can construct has 11 edge and that is ‹e,he, h› (no intermediary vertices). Let's do this!

    -

    -

    +

    +

    Okay, so we have a graph that breaks the rule we have laid. However, we need to run BFS to obtain the new BFS tree, since we have changed the graph.

    tip

    Do we need to run BFS after every change?

    ­I am leaving that as an exercise ;)

    -

    -

    +

    +

    Oops, we have gotten a new BFS tree, that has a height difference of 1.

    tip

    Try to think about a way this can be generalized for shortening of minimal length 3 to minimal length 2 ;)

diff --git a/algorithms/graphs/iterative-and-iterators/index.html b/algorithms/graphs/iterative-and-iterators/index.html index de7c7b7..0298c95 100644 --- a/algorithms/graphs/iterative-and-iterators/index.html +++ b/algorithms/graphs/iterative-and-iterators/index.html @@ -2,7 +2,7 @@ - + Iterative algorithms via iterators | mf @@ -16,8 +16,8 @@ - - + +

Iterative algorithms via iterators

Introduction​

diff --git a/algorithms/hash-tables/breaking/index.html b/algorithms/hash-tables/breaking/index.html index 9f78f55..b906f2e 100644 --- a/algorithms/hash-tables/breaking/index.html +++ b/algorithms/hash-tables/breaking/index.html @@ -2,7 +2,7 @@ - + Breaking Hash Table | mf @@ -16,8 +16,8 @@ - - + +

Breaking Hash Table

We will try to break a hash table and discuss possible ways how to prevent such diff --git a/algorithms/hash-tables/breaking/mitigations/index.html b/algorithms/hash-tables/breaking/mitigations/index.html index f9e0f6c..0d747f9 100644 --- a/algorithms/hash-tables/breaking/mitigations/index.html +++ b/algorithms/hash-tables/breaking/mitigations/index.html @@ -2,7 +2,7 @@ - + Possible Mitigations | mf @@ -16,8 +16,8 @@ - - + +

Possible Mitigations

There are multiple ways the issues created above can be mitigated. Still we can diff --git a/algorithms/hash-tables/breaking/python/index.html b/algorithms/hash-tables/breaking/python/index.html index 8842389..374e4a9 100644 --- a/algorithms/hash-tables/breaking/python/index.html +++ b/algorithms/hash-tables/breaking/python/index.html @@ -2,7 +2,7 @@ - + Breaking Python | mf @@ -16,8 +16,8 @@ - - + +

Breaking the Hash Table in Python

diff --git a/algorithms/index.html b/algorithms/index.html index dd9e99f..b770774 100644 --- a/algorithms/index.html +++ b/algorithms/index.html @@ -2,7 +2,7 @@ - + Introduction | mf @@ -14,8 +14,8 @@ - - + +

Introduction

In this part you can find “random” additional materials I have written over the @@ -23,6 +23,6 @@ course of teaching Algorithms and data structures I.

It is a various mix of stuff that may have been produced as a follow-up on some question asked at the seminar or spontanously.

If you have some ideas for posts, please do not hesitate to submit them as issues -in the linked GitLab.

+in the linked GitLab.

\ No newline at end of file diff --git a/algorithms/paths/bf-to-astar/astar/index.html b/algorithms/paths/bf-to-astar/astar/index.html index be0723c..76ced05 100644 --- a/algorithms/paths/bf-to-astar/astar/index.html +++ b/algorithms/paths/bf-to-astar/astar/index.html @@ -2,7 +2,7 @@ - + A* algorithm | mf @@ -16,8 +16,8 @@ - - + +

A* algorithm

Intro​

diff --git a/algorithms/paths/bf-to-astar/bf/index.html b/algorithms/paths/bf-to-astar/bf/index.html index 290417e..6cbc407 100644 --- a/algorithms/paths/bf-to-astar/bf/index.html +++ b/algorithms/paths/bf-to-astar/bf/index.html @@ -2,7 +2,7 @@ - + BF | mf - - + +

BF

Basic idea​

diff --git a/algorithms/paths/bf-to-astar/dijkstra/index.html b/algorithms/paths/bf-to-astar/dijkstra/index.html index 2b264d3..2b6e909 100644 --- a/algorithms/paths/bf-to-astar/dijkstra/index.html +++ b/algorithms/paths/bf-to-astar/dijkstra/index.html @@ -2,7 +2,7 @@ - + Dijkstra's algorithm | mf @@ -16,8 +16,8 @@ - - + +

Dijkstra's algorithm

Intro​

@@ -37,7 +37,7 @@ Would that be even possible?

Yes, it would! And that's when Dijkstra's algorithm comes in.

Dijkstra's algorithm​

I'll start with a well-known meme about Dijkstra's algorithm: -Dijkstra's algorithm meme

+Dijkstra's algorithm meme

And then follow up on that with the actual backstory from Dijkstra himself:

What is the shortest way to travel from Rotterdam to Groningen, in general: diff --git a/algorithms/paths/bf-to-astar/index.html b/algorithms/paths/bf-to-astar/index.html index b9bf28a..013cf61 100644 --- a/algorithms/paths/bf-to-astar/index.html +++ b/algorithms/paths/bf-to-astar/index.html @@ -2,7 +2,7 @@ - + From BF to A* | mf @@ -16,8 +16,8 @@ - - + +

From BF to A*

Intro​

diff --git a/algorithms/rb-trees/applications/index.html b/algorithms/rb-trees/applications/index.html index ad3d439..6aaa4ba 100644 --- a/algorithms/rb-trees/applications/index.html +++ b/algorithms/rb-trees/applications/index.html @@ -2,7 +2,7 @@ - + Použití červeno-černých stromů | mf @@ -16,8 +16,8 @@ - - + +

Použití červeno-černých stromů

Použití​

diff --git a/algorithms/rb-trees/rules/index.html b/algorithms/rb-trees/rules/index.html index a6266c2..c96fc73 100644 --- a/algorithms/rb-trees/rules/index.html +++ b/algorithms/rb-trees/rules/index.html @@ -2,7 +2,7 @@ - + On the rules of the red-black tree | mf @@ -16,8 +16,8 @@ - - + +

On the rules of the red-black tree

Introduction​

@@ -54,8 +54,8 @@ it means that there was no black node added on the path between us and therefore my child would be colored red.

Example of a red-black tree that keeps count of black nodes on paths to the leaves follows:

-

Red-black tree with black height -Red-black tree with black height

+

Red-black tree with black height +Red-black tree with black height

We mark the black heights in superscript. You can see that all leaves have the black height equal to 11. Let's take a look at some of the interesting cases:

    @@ -101,14 +101,14 @@ both relying on the invariant in the algorithm and afterwards by enforcing the black root property.

    If we decide to omit this condition, we need to address it in the pseudocodes accordingly.

    -
    Usual algorithm with black rootAllowing red root
    1ª insertion1ª insertion1ª insertion1ª insertion
    2ª insertion2ª insertion2ª insertion2ª insertion
    3ª insertion3ª insertion3ª insertion3ª insertion
    4ª insertion4ª insertion4ª insertion4ª insertion
    5ª insertion5ª insertion5ª insertion5ª insertion
    6ª insertion6ª insertion6ª insertion6ª insertion
    7ª insertion7ª insertion7ª insertion7ª insertion
    8ª insertion8ª insertion8ª insertion8ª insertion
    9ª insertion9ª insertion9ª insertion9ª insertion
    +
    Usual algorithm with black rootAllowing red root
    1ª insertion1ª insertion1ª insertion1ª insertion
    2ª insertion2ª insertion2ª insertion2ª insertion
    3ª insertion3ª insertion3ª insertion3ª insertion
    4ª insertion4ª insertion4ª insertion4ª insertion
    5ª insertion5ª insertion5ª insertion5ª insertion
    6ª insertion6ª insertion6ª insertion6ª insertion
    7ª insertion7ª insertion7ª insertion7ª insertion
    8ª insertion8ª insertion8ª insertion8ª insertion
    9ª insertion9ª insertion9ª insertion9ª insertion

    3ª Every leaf (nil) is black.​

    Now, this rule is a funny one. What does this imply and can I interpret this in some other way? Let's go through some of the possible ways I can look at this and how would they affect the other rules and balancing.

    We will experiment with the following tree: - -

    + +

    We should start by counting the black nodes from root to the nil leaves based on the rules. We have multiple similar paths, so we will pick only the interesting ones.

    @@ -160,9 +160,9 @@ further.

    balancing of the tree below.

    -

    -

    +

    +

    We can create a big subtree with only red nodes and even when keeping the rest of the rules maintained, it will break the time complexity. It stops us from “hacking” the black height requirement laid by the 5th rule.

    diff --git a/algorithms/recursion/karel/index.html b/algorithms/recursion/karel/index.html index 41b4d68..efad64f 100644 --- a/algorithms/recursion/karel/index.html +++ b/algorithms/recursion/karel/index.html @@ -2,7 +2,7 @@ - + Recursion and backtracking with Robot Karel | mf @@ -16,8 +16,8 @@ - - + +

    Recursion and backtracking with Robot Karel

      @@ -66,13 +66,13 @@ current location

      Problem​

      Your task is to decide whether there is an exit from the maze or not. You can see an example of a maze here:

      -

      Image of the maze

      +

      Image of the maze

      Simple problem to get familiar with the robot​

      If you feel completely lost after the previous description, let me start you off with a simpler problem.

      You are standing in front of the stairs, your task is to walk up the stairs.

      You can see an example of such map here:

      -

      Image of the stairs

      +

      Image of the stairs

      Brainstorm the idea​

      As a first step write down any ideas and things that you have noticed or came to your mind. Ideally:

      diff --git a/algorithms/recursion/karel/solution/index.html b/algorithms/recursion/karel/solution/index.html index e326772..fd3d00d 100644 --- a/algorithms/recursion/karel/solution/index.html +++ b/algorithms/recursion/karel/solution/index.html @@ -2,7 +2,7 @@ - + Solution to the problem | mf @@ -16,8 +16,8 @@ - - + +

      Solving the maze problem

      diff --git a/algorithms/recursion/pyramid-slide-down/bottom-up-dp/index.html b/algorithms/recursion/pyramid-slide-down/bottom-up-dp/index.html index e3f2cdc..7067c4b 100644 --- a/algorithms/recursion/pyramid-slide-down/bottom-up-dp/index.html +++ b/algorithms/recursion/pyramid-slide-down/bottom-up-dp/index.html @@ -2,7 +2,7 @@ - + Bottom-up DP solution | mf @@ -16,8 +16,8 @@ - - + +

      Bottom-up dynamic programming

      diff --git a/algorithms/recursion/pyramid-slide-down/greedy/index.html b/algorithms/recursion/pyramid-slide-down/greedy/index.html index 1e8dc4e..b7a0c54 100644 --- a/algorithms/recursion/pyramid-slide-down/greedy/index.html +++ b/algorithms/recursion/pyramid-slide-down/greedy/index.html @@ -2,7 +2,7 @@ - + Greedy solution | mf @@ -16,8 +16,8 @@ - - + +

      Greedy solution

      We will try to optimize it a bit. Let's start with a relatively simple greedy diff --git a/algorithms/recursion/pyramid-slide-down/index.html b/algorithms/recursion/pyramid-slide-down/index.html index 49b9b0a..d264368 100644 --- a/algorithms/recursion/pyramid-slide-down/index.html +++ b/algorithms/recursion/pyramid-slide-down/index.html @@ -2,7 +2,7 @@ - + Introduction to dynamic programming | mf @@ -16,8 +16,8 @@ - - + +

      Introduction to dynamic programming

      In this series we will try to solve one problem in different ways.

      diff --git a/algorithms/recursion/pyramid-slide-down/naive/index.html b/algorithms/recursion/pyramid-slide-down/naive/index.html index 6f1d528..adafdeb 100644 --- a/algorithms/recursion/pyramid-slide-down/naive/index.html +++ b/algorithms/recursion/pyramid-slide-down/naive/index.html @@ -2,7 +2,7 @@ - + Naïve solution | mf @@ -16,8 +16,8 @@ - - + +

      Naïve solution

      Our naïve solution consists of trying out all the possible slides and finding diff --git a/algorithms/recursion/pyramid-slide-down/top-down-dp/index.html b/algorithms/recursion/pyramid-slide-down/top-down-dp/index.html index 0aec925..2415276 100644 --- a/algorithms/recursion/pyramid-slide-down/top-down-dp/index.html +++ b/algorithms/recursion/pyramid-slide-down/top-down-dp/index.html @@ -2,7 +2,7 @@ - + Top-down DP solution | mf @@ -16,8 +16,8 @@ - - + +

      Top-down dynamic programming

      diff --git a/algorithms/tags/a-star/index.html b/algorithms/tags/a-star/index.html index a8c7f44..c1e11e5 100644 --- a/algorithms/tags/a-star/index.html +++ b/algorithms/tags/a-star/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "a star" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "a star"

      View All Tags

      From BF to A*

      Figuring out shortest-path problem from the BF to the A* algorithm. diff --git a/algorithms/tags/applications/index.html b/algorithms/tags/applications/index.html index 0f0b696..459a6d0 100644 --- a/algorithms/tags/applications/index.html +++ b/algorithms/tags/applications/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "applications" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "applications"

      View All Tags

      Použití červeno-černých stromů

      Ukázka použití červeno-černých stromů v standardních knižnicích známých jazyků. diff --git a/algorithms/tags/astar/index.html b/algorithms/tags/astar/index.html index 8ed249b..c91db5d 100644 --- a/algorithms/tags/astar/index.html +++ b/algorithms/tags/astar/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "astar" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "astar"

      View All Tags

      A* algorithm

      Moving from Dijkstra's algorithm into the A* algorithm. diff --git a/algorithms/tags/backtracking/index.html b/algorithms/tags/backtracking/index.html index 531f991..c419164 100644 --- a/algorithms/tags/backtracking/index.html +++ b/algorithms/tags/backtracking/index.html @@ -2,7 +2,7 @@ - + 2 docs tagged with "backtracking" | mf @@ -14,8 +14,8 @@ - - + +

      2 docs tagged with "backtracking"

      View All Tags

      Recursion and backtracking with Robot Karel

      A problem with too many restrictions. diff --git a/algorithms/tags/balanced-trees/index.html b/algorithms/tags/balanced-trees/index.html index 1d44146..ceead8f 100644 --- a/algorithms/tags/balanced-trees/index.html +++ b/algorithms/tags/balanced-trees/index.html @@ -2,7 +2,7 @@ - + 2 docs tagged with "balanced trees" | mf @@ -14,8 +14,8 @@ - - + +

      2 docs tagged with "balanced trees"

      View All Tags

      On the rules of the red-black tree

      Shower thoughts on the rules of the red-black tree. diff --git a/algorithms/tags/bellman-ford/index.html b/algorithms/tags/bellman-ford/index.html index cbe5771..36490a0 100644 --- a/algorithms/tags/bellman-ford/index.html +++ b/algorithms/tags/bellman-ford/index.html @@ -2,7 +2,7 @@ - + 2 docs tagged with "bellman ford" | mf @@ -14,8 +14,8 @@ - - + +

      2 docs tagged with "bellman ford"

      View All Tags

      BF

      Solving the shortest path problem with a naïve approach that turns into diff --git a/algorithms/tags/bfs/index.html b/algorithms/tags/bfs/index.html index 629b536..445f0a3 100644 --- a/algorithms/tags/bfs/index.html +++ b/algorithms/tags/bfs/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "bfs" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "bfs"

      View All Tags

      Distance boundaries from BFS tree on undirected graphs

      Short explanation of distance boundaries deduced from a BFS tree. diff --git a/algorithms/tags/bottom-up-dp/index.html b/algorithms/tags/bottom-up-dp/index.html index 8531042..8f9bad0 100644 --- a/algorithms/tags/bottom-up-dp/index.html +++ b/algorithms/tags/bottom-up-dp/index.html @@ -2,7 +2,7 @@ - + 2 docs tagged with "bottom-up-dp" | mf @@ -14,8 +14,8 @@ - - + +

      2 docs tagged with "bottom-up-dp"

      View All Tags

      Bottom-up DP solution

      Bottom-up DP solution of the Pyramid Slide Down. diff --git a/algorithms/tags/brute-force/index.html b/algorithms/tags/brute-force/index.html index b489d86..89a4e4f 100644 --- a/algorithms/tags/brute-force/index.html +++ b/algorithms/tags/brute-force/index.html @@ -2,7 +2,7 @@ - + 2 docs tagged with "brute force" | mf @@ -14,8 +14,8 @@ - - + +

      2 docs tagged with "brute force"

      View All Tags

      BF

      Solving the shortest path problem with a naïve approach that turns into diff --git a/algorithms/tags/c/index.html b/algorithms/tags/c/index.html index 5aa1223..5ab3997 100644 --- a/algorithms/tags/c/index.html +++ b/algorithms/tags/c/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "c" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "c"

      View All Tags

      Time complexity of ‹extend›

      How to make inefficient algorithm unknowingly. diff --git a/algorithms/tags/cpp/index.html b/algorithms/tags/cpp/index.html index 3693f12..d59f9e2 100644 --- a/algorithms/tags/cpp/index.html +++ b/algorithms/tags/cpp/index.html @@ -2,7 +2,7 @@ - + 7 docs tagged with "cpp" | mf @@ -14,8 +14,8 @@ - - + +

      7 docs tagged with "cpp"

      View All Tags

      A* algorithm

      Moving from Dijkstra's algorithm into the A* algorithm. diff --git a/algorithms/tags/csharp/index.html b/algorithms/tags/csharp/index.html index 1395dea..e88123e 100644 --- a/algorithms/tags/csharp/index.html +++ b/algorithms/tags/csharp/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "csharp" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "csharp"

      View All Tags

      Iterative algorithms via iterators

      Iterative DFS using iterators. diff --git a/algorithms/tags/dijkstra/index.html b/algorithms/tags/dijkstra/index.html index 114f5b7..3984a65 100644 --- a/algorithms/tags/dijkstra/index.html +++ b/algorithms/tags/dijkstra/index.html @@ -2,7 +2,7 @@ - + 2 docs tagged with "dijkstra" | mf @@ -14,8 +14,8 @@ - - + +

      2 docs tagged with "dijkstra"

      View All Tags

      Dijkstra's algorithm

      Moving from Bellman-Ford into the Dijsktra's algorithm. diff --git a/algorithms/tags/dynamic-array/index.html b/algorithms/tags/dynamic-array/index.html index ea39229..20f9d3b 100644 --- a/algorithms/tags/dynamic-array/index.html +++ b/algorithms/tags/dynamic-array/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "dynamic array" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "dynamic array"

      View All Tags

      Time complexity of ‹extend›

      How to make inefficient algorithm unknowingly. diff --git a/algorithms/tags/dynamic-programming/index.html b/algorithms/tags/dynamic-programming/index.html index 24e8eba..aba0075 100644 --- a/algorithms/tags/dynamic-programming/index.html +++ b/algorithms/tags/dynamic-programming/index.html @@ -2,7 +2,7 @@ - + 7 docs tagged with "dynamic programming" | mf @@ -14,8 +14,8 @@ - - + +

      7 docs tagged with "dynamic programming"

      View All Tags

      A* algorithm

      Moving from Dijkstra's algorithm into the A* algorithm. diff --git a/algorithms/tags/exponential/index.html b/algorithms/tags/exponential/index.html index ac613e1..748b4e0 100644 --- a/algorithms/tags/exponential/index.html +++ b/algorithms/tags/exponential/index.html @@ -2,7 +2,7 @@ - + 2 docs tagged with "exponential" | mf @@ -14,8 +14,8 @@ - - + +

      2 docs tagged with "exponential"

      View All Tags

      Introduction to dynamic programming

      Solving a problem in different ways. diff --git a/algorithms/tags/graphs/index.html b/algorithms/tags/graphs/index.html index f25e174..31e8b3e 100644 --- a/algorithms/tags/graphs/index.html +++ b/algorithms/tags/graphs/index.html @@ -2,7 +2,7 @@ - + 2 docs tagged with "graphs" | mf @@ -14,8 +14,8 @@ - - + +

      2 docs tagged with "graphs"

      View All Tags

      Distance boundaries from BFS tree on undirected graphs

      Short explanation of distance boundaries deduced from a BFS tree. diff --git a/algorithms/tags/greedy/index.html b/algorithms/tags/greedy/index.html index 18df5a2..39da3f8 100644 --- a/algorithms/tags/greedy/index.html +++ b/algorithms/tags/greedy/index.html @@ -2,7 +2,7 @@ - + 4 docs tagged with "greedy" | mf @@ -14,8 +14,8 @@ - - + +

      4 docs tagged with "greedy"

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      Dijkstra's algorithm

      Moving from Bellman-Ford into the Dijsktra's algorithm. diff --git a/algorithms/tags/hash-tables/index.html b/algorithms/tags/hash-tables/index.html index 5dd90b4..c28a4b6 100644 --- a/algorithms/tags/hash-tables/index.html +++ b/algorithms/tags/hash-tables/index.html @@ -2,7 +2,7 @@ - + 3 docs tagged with "hash-tables" | mf @@ -14,8 +14,8 @@ - - + +

      3 docs tagged with "hash-tables"

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      Breaking Hash Table

      How to get the linear time complexity in a hash table. diff --git a/algorithms/tags/index.html b/algorithms/tags/index.html index ef2dbe5..16708fb 100644 --- a/algorithms/tags/index.html +++ b/algorithms/tags/index.html @@ -2,7 +2,7 @@ - + Tags | mf @@ -14,8 +14,8 @@ - - + +

      Tags

      diff --git a/algorithms/tags/iterative/index.html b/algorithms/tags/iterative/index.html index e6a98a6..db6d878 100644 --- a/algorithms/tags/iterative/index.html +++ b/algorithms/tags/iterative/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "iterative" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "iterative"

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      Iterative algorithms via iterators

      Iterative DFS using iterators. diff --git a/algorithms/tags/iterators/index.html b/algorithms/tags/iterators/index.html index 550d1ef..fb6bb64 100644 --- a/algorithms/tags/iterators/index.html +++ b/algorithms/tags/iterators/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "iterators" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "iterators"

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      Iterative algorithms via iterators

      Iterative DFS using iterators. diff --git a/algorithms/tags/java/index.html b/algorithms/tags/java/index.html index bf13822..82dda72 100644 --- a/algorithms/tags/java/index.html +++ b/algorithms/tags/java/index.html @@ -2,7 +2,7 @@ - + 5 docs tagged with "java" | mf @@ -14,8 +14,8 @@ - - + +

      5 docs tagged with "java"

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      Bottom-up DP solution

      Bottom-up DP solution of the Pyramid Slide Down. diff --git a/algorithms/tags/karel/index.html b/algorithms/tags/karel/index.html index 6e72795..ae74d24 100644 --- a/algorithms/tags/karel/index.html +++ b/algorithms/tags/karel/index.html @@ -2,7 +2,7 @@ - + 2 docs tagged with "karel" | mf @@ -14,8 +14,8 @@ - - + +

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      Recursion and backtracking with Robot Karel

      A problem with too many restrictions. diff --git a/algorithms/tags/postconditions/index.html b/algorithms/tags/postconditions/index.html index d8f96ba..1e2ffca 100644 --- a/algorithms/tags/postconditions/index.html +++ b/algorithms/tags/postconditions/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "postconditions" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "postconditions"

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      Vague postconditions and proving correctness of algorithms

      Debugging and testing with precise postconditions. diff --git a/algorithms/tags/python/index.html b/algorithms/tags/python/index.html index a7b39cc..e70f482 100644 --- a/algorithms/tags/python/index.html +++ b/algorithms/tags/python/index.html @@ -2,7 +2,7 @@ - + 7 docs tagged with "python" | mf @@ -14,8 +14,8 @@ - - + +

      7 docs tagged with "python"

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      Breaking Hash Table

      How to get the linear time complexity in a hash table. diff --git a/algorithms/tags/recursion/index.html b/algorithms/tags/recursion/index.html index 2677789..1cc5613 100644 --- a/algorithms/tags/recursion/index.html +++ b/algorithms/tags/recursion/index.html @@ -2,7 +2,7 @@ - + 5 docs tagged with "recursion" | mf @@ -14,8 +14,8 @@ - - + +

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      Introduction to dynamic programming

      Solving a problem in different ways. diff --git a/algorithms/tags/red-black-trees/index.html b/algorithms/tags/red-black-trees/index.html index fae94d1..1930e5c 100644 --- a/algorithms/tags/red-black-trees/index.html +++ b/algorithms/tags/red-black-trees/index.html @@ -2,7 +2,7 @@ - + 2 docs tagged with "red-black trees" | mf @@ -14,8 +14,8 @@ - - + +

      2 docs tagged with "red-black trees"

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      On the rules of the red-black tree

      Shower thoughts on the rules of the red-black tree. diff --git a/algorithms/tags/solution/index.html b/algorithms/tags/solution/index.html index 50c4c08..f468c4d 100644 --- a/algorithms/tags/solution/index.html +++ b/algorithms/tags/solution/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "solution" | mf @@ -14,8 +14,8 @@ - - + +

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      Solution to the problem

      Solving the problem introduced in the previous post. diff --git a/algorithms/tags/sorting/index.html b/algorithms/tags/sorting/index.html index 16ac0f0..7b7ea65 100644 --- a/algorithms/tags/sorting/index.html +++ b/algorithms/tags/sorting/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "sorting" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "sorting"

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      Vague postconditions and proving correctness of algorithms

      Debugging and testing with precise postconditions. diff --git a/algorithms/tags/testing/index.html b/algorithms/tags/testing/index.html index 8ddeed2..72e8c4d 100644 --- a/algorithms/tags/testing/index.html +++ b/algorithms/tags/testing/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "testing" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "testing"

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      Vague postconditions and proving correctness of algorithms

      Debugging and testing with precise postconditions. diff --git a/algorithms/tags/time-complexity/index.html b/algorithms/tags/time-complexity/index.html index edb8d03..c432205 100644 --- a/algorithms/tags/time-complexity/index.html +++ b/algorithms/tags/time-complexity/index.html @@ -2,7 +2,7 @@ - + One doc tagged with "time complexity" | mf @@ -14,8 +14,8 @@ - - + +

      One doc tagged with "time complexity"

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      Time complexity of ‹extend›

      How to make inefficient algorithm unknowingly. diff --git a/algorithms/tags/top-down-dp/index.html b/algorithms/tags/top-down-dp/index.html index 4212445..8e31fec 100644 --- a/algorithms/tags/top-down-dp/index.html +++ b/algorithms/tags/top-down-dp/index.html @@ -2,7 +2,7 @@ - + 2 docs tagged with "top-down-dp" | mf @@ -14,8 +14,8 @@ - - + +

      2 docs tagged with "top-down-dp"

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      Introduction to dynamic programming

      Solving a problem in different ways. diff --git a/algorithms/time-complexity/extend/index.html b/algorithms/time-complexity/extend/index.html index 220a67b..cc9e3d3 100644 --- a/algorithms/time-complexity/extend/index.html +++ b/algorithms/time-complexity/extend/index.html @@ -2,7 +2,7 @@ - + Time complexity of ‹extend› | mf @@ -16,8 +16,8 @@ - - + +

      Time complexity of ‹extend›

      Introduction​

      @@ -56,8 +56,8 @@ elements from b.

      Example #2​

      As we could observe in the example above, extend iterates over all of the elements that it adds. In case of recursive calls, it results in iterating over the same elements multiple times.

      Consider constructing of this list:

      -

      Rendered construction of the list -Rendered construction of the list

      +

      Rendered construction of the list +Rendered construction of the list

      Let us assume that you extend the result with the list that you get from the recursive call.

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150}),this.cScale8=this.cScale8||h(this.primaryColor,{h:210,l:150}),this.cScale9=this.cScale9||h(this.primaryColor,{h:270}),this.cScale10=this.cScale10||h(this.primaryColor,{h:300}),this.cScale11=this.cScale11||h(this.primaryColor,{h:330}),this.darkMode)for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScale"+h]=(0,p.Z)(this["cScale"+h],75);else for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScale"+h]=(0,p.Z)(this["cScale"+h],25);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleInv"+h]=this["cScaleInv"+h]||f(this["cScale"+h]);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this.darkMode?this["cScalePeer"+h]=this["cScalePeer"+h]||(0,g.Z)(this["cScale"+h],10):this["cScalePeer"+h]=this["cScalePeer"+h]||(0,p.Z)(this["cScale"+h],10);this.scaleLabelColor=this.scaleLabelColor||this.labelTextColor;for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleLabel"+h]=this["cScaleLabel"+h]||this.scaleLabelColor;const d=this.darkMode?-4:-1;for(let f=0;f<5;f++)this["surface"+f]=this["surface"+f]||h(this.mainBkg,{h:180,s:-15,l:d*(5+3*f)}),this["surfacePeer"+f]=this["surfacePeer"+f]||h(this.mainBkg,{h:180,s:-15,l:d*(8+3*f)});this.classText=this.classText||this.textColor,this.fillType0=this.fillType0||this.primaryColor,this.fillType1=this.fillType1||this.secondaryColor,this.fillType2=this.fillType2||h(this.primaryColor,{h:64}),this.fillType3=this.fillType3||h(this.secondaryColor,{h:64}),this.fillType4=this.fillType4||h(this.primaryColor,{h:-64}),this.fillType5=this.fillType5||h(this.secondaryColor,{h:-64}),this.fillType6=this.fillType6||h(this.primaryColor,{h:128}),this.fillType7=this.fillType7||h(this.secondaryColor,{h:128}),this.pie1=this.pie1||this.primaryColor,this.pie2=this.pie2||this.secondaryColor,this.pie3=this.pie3||this.tertiaryColor,this.pie4=this.pie4||h(this.primaryColor,{l:-10}),this.pie5=this.pie5||h(this.secondaryColor,{l:-10}),this.pie6=this.pie6||h(this.tertiaryColor,{l:-10}),this.pie7=this.pie7||h(this.primaryColor,{h:60,l:-10}),this.pie8=this.pie8||h(this.primaryColor,{h:-60,l:-10}),this.pie9=this.pie9||h(this.primaryColor,{h:120,l:0}),this.pie10=this.pie10||h(this.primaryColor,{h:60,l:-20}),this.pie11=this.pie11||h(this.primaryColor,{h:-60,l:-20}),this.pie12=this.pie12||h(this.primaryColor,{h:120,l:-10}),this.pieTitleTextSize=this.pieTitleTextSize||"25px",this.pieTitleTextColor=this.pieTitleTextColor||this.taskTextDarkColor,this.pieSectionTextSize=this.pieSectionTextSize||"17px",this.pieSectionTextColor=this.pieSectionTextColor||this.textColor,this.pieLegendTextSize=this.pieLegendTextSize||"17px",this.pieLegendTextColor=this.pieLegendTextColor||this.taskTextDarkColor,this.pieStrokeColor=this.pieStrokeColor||"black",this.pieStrokeWidth=this.pieStrokeWidth||"2px",this.pieOuterStrokeWidth=this.pieOuterStrokeWidth||"2px",this.pieOuterStrokeColor=this.pieOuterStrokeColor||"black",this.pieOpacity=this.pieOpacity||"0.7",this.quadrant1Fill=this.quadrant1Fill||this.primaryColor,this.quadrant2Fill=this.quadrant2Fill||h(this.primaryColor,{r:5,g:5,b:5}),this.quadrant3Fill=this.quadrant3Fill||h(this.primaryColor,{r:10,g:10,b:10}),this.quadrant4Fill=this.quadrant4Fill||h(this.primaryColor,{r:15,g:15,b:15}),this.quadrant1TextFill=this.quadrant1TextFill||this.primaryTextColor,this.quadrant2TextFill=this.quadrant2TextFill||h(this.primaryTextColor,{r:-5,g:-5,b:-5}),this.quadrant3TextFill=this.quadrant3TextFill||h(this.primaryTextColor,{r:-10,g:-10,b:-10}),this.quadrant4TextFill=this.quadrant4TextFill||h(this.primaryTextColor,{r:-15,g:-15,b:-15}),this.quadrantPointFill=this.quadrantPointFill||(0,m.Z)(this.quadrant1Fill)?(0,g.Z)(this.quadrant1Fill):(0,p.Z)(this.quadrant1Fill),this.quadrantPointTextFill=this.quadrantPointTextFill||this.primaryTextColor,this.quadrantXAxisTextFill=this.quadrantXAxisTextFill||this.primaryTextColor,this.quadrantYAxisTextFill=this.quadrantYAxisTextFill||this.primaryTextColor,this.quadrantInternalBorderStrokeFill=this.quadrantInternalBorderStrokeFill||this.primaryBorderColor,this.quadrantExternalBorderStrokeFill=this.quadrantExternalBorderStrokeFill||this.primaryBorderColor,this.quadrantTitleFill=this.quadrantTitleFill||this.primaryTextColor,this.xyChart={backgroundColor:(null==(t=this.xyChart)?void 0:t.backgroundColor)||this.background,titleColor:(null==(e=this.xyChart)?void 0:e.titleColor)||this.primaryTextColor,xAxisTitleColor:(null==(i=this.xyChart)?void 0:i.xAxisTitleColor)||this.primaryTextColor,xAxisLabelColor:(null==(r=this.xyChart)?void 0:r.xAxisLabelColor)||this.primaryTextColor,xAxisTickColor:(null==(n=this.xyChart)?void 0:n.xAxisTickColor)||this.primaryTextColor,xAxisLineColor:(null==(o=this.xyChart)?void 0:o.xAxisLineColor)||this.primaryTextColor,yAxisTitleColor:(null==(a=this.xyChart)?void 0:a.yAxisTitleColor)||this.primaryTextColor,yAxisLabelColor:(null==(s=this.xyChart)?void 0:s.yAxisLabelColor)||this.primaryTextColor,yAxisTickColor:(null==(l=this.xyChart)?void 0:l.yAxisTickColor)||this.primaryTextColor,yAxisLineColor:(null==(c=this.xyChart)?void 0:c.yAxisLineColor)||this.primaryTextColor,plotColorPalette:(null==(u=this.xyChart)?void 0:u.plotColorPalette)||"#FFF4DD,#FFD8B1,#FFA07A,#ECEFF1,#D6DBDF,#C3E0A8,#FFB6A4,#FFD74D,#738FA7,#FFFFF0"},this.requirementBackground=this.requirementBackground||this.primaryColor,this.requirementBorderColor=this.requirementBorderColor||this.primaryBorderColor,this.requirementBorderSize=this.requirementBorderSize||"1",this.requirementTextColor=this.requirementTextColor||this.primaryTextColor,this.relationColor=this.relationColor||this.lineColor,this.relationLabelBackground=this.relationLabelBackground||(this.darkMode?(0,p.Z)(this.secondaryColor,30):this.secondaryColor),this.relationLabelColor=this.relationLabelColor||this.actorTextColor,this.git0=this.git0||this.primaryColor,this.git1=this.git1||this.secondaryColor,this.git2=this.git2||this.tertiaryColor,this.git3=this.git3||h(this.primaryColor,{h:-30}),this.git4=this.git4||h(this.primaryColor,{h:-60}),this.git5=this.git5||h(this.primaryColor,{h:-90}),this.git6=this.git6||h(this.primaryColor,{h:60}),this.git7=this.git7||h(this.primaryColor,{h:120}),this.darkMode?(this.git0=(0,g.Z)(this.git0,25),this.git1=(0,g.Z)(this.git1,25),this.git2=(0,g.Z)(this.git2,25),this.git3=(0,g.Z)(this.git3,25),this.git4=(0,g.Z)(this.git4,25),this.git5=(0,g.Z)(this.git5,25),this.git6=(0,g.Z)(this.git6,25),this.git7=(0,g.Z)(this.git7,25)):(this.git0=(0,p.Z)(this.git0,25),this.git1=(0,p.Z)(this.git1,25),this.git2=(0,p.Z)(this.git2,25),this.git3=(0,p.Z)(this.git3,25),this.git4=(0,p.Z)(this.git4,25),this.git5=(0,p.Z)(this.git5,25),this.git6=(0,p.Z)(this.git6,25),this.git7=(0,p.Z)(this.git7,25)),this.gitInv0=this.gitInv0||f(this.git0),this.gitInv1=this.gitInv1||f(this.git1),this.gitInv2=this.gitInv2||f(this.git2),this.gitInv3=this.gitInv3||f(this.git3),this.gitInv4=this.gitInv4||f(this.git4),this.gitInv5=this.gitInv5||f(this.git5),this.gitInv6=this.gitInv6||f(this.git6),this.gitInv7=this.gitInv7||f(this.git7),this.branchLabelColor=this.branchLabelColor||(this.darkMode?"black":this.labelTextColor),this.gitBranchLabel0=this.gitBranchLabel0||this.branchLabelColor,this.gitBranchLabel1=this.gitBranchLabel1||this.branchLabelColor,this.gitBranchLabel2=this.gitBranchLabel2||this.branchLabelColor,this.gitBranchLabel3=this.gitBranchLabel3||this.branchLabelColor,this.gitBranchLabel4=this.gitBranchLabel4||this.branchLabelColor,this.gitBranchLabel5=this.gitBranchLabel5||this.branchLabelColor,this.gitBranchLabel6=this.gitBranchLabel6||this.branchLabelColor,this.gitBranchLabel7=this.gitBranchLabel7||this.branchLabelColor,this.tagLabelColor=this.tagLabelColor||this.primaryTextColor,this.tagLabelBackground=this.tagLabelBackground||this.primaryColor,this.tagLabelBorder=this.tagBorder||this.primaryBorderColor,this.tagLabelFontSize=this.tagLabelFontSize||"10px",this.commitLabelColor=this.commitLabelColor||this.secondaryTextColor,this.commitLabelBackground=this.commitLabelBackground||this.secondaryColor,this.commitLabelFontSize=this.commitLabelFontSize||"10px",this.attributeBackgroundColorOdd=this.attributeBackgroundColorOdd||kt,this.attributeBackgroundColorEven=this.attributeBackgroundColorEven||Tt}calculate(t){if("object"!=typeof t)return void this.updateColors();const e=Object.keys(t);e.forEach((e=>{this[e]=t[e]})),this.updateColors(),e.forEach((e=>{this[e]=t[e]}))}};let St=class{constructor(){this.background="#333",this.primaryColor="#1f2020",this.secondaryColor=(0,g.Z)(this.primaryColor,16),this.tertiaryColor=h(this.primaryColor,{h:-160}),this.primaryBorderColor=f(this.background),this.secondaryBorderColor=vt(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=vt(this.tertiaryColor,this.darkMode),this.primaryTextColor=f(this.primaryColor),this.secondaryTextColor=f(this.secondaryColor),this.tertiaryTextColor=f(this.tertiaryColor),this.lineColor=f(this.background),this.textColor=f(this.background),this.mainBkg="#1f2020",this.secondBkg="calculated",this.mainContrastColor="lightgrey",this.darkTextColor=(0,g.Z)(f("#323D47"),10),this.lineColor="calculated",this.border1="#81B1DB",this.border2=(0,u.Z)(255,255,255,.25),this.arrowheadColor="calculated",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.labelBackground="#181818",this.textColor="#ccc",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="#F9FFFE",this.edgeLabelBackground="calculated",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="calculated",this.actorLineColor="calculated",this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="calculated",this.activationBkgColor="calculated",this.sequenceNumberColor="black",this.sectionBkgColor=(0,p.Z)("#EAE8D9",30),this.altSectionBkgColor="calculated",this.sectionBkgColor2="#EAE8D9",this.excludeBkgColor=(0,p.Z)(this.sectionBkgColor,10),this.taskBorderColor=(0,u.Z)(255,255,255,70),this.taskBkgColor="calculated",this.taskTextColor="calculated",this.taskTextLightColor="calculated",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor=(0,u.Z)(255,255,255,50),this.activeTaskBkgColor="#81B1DB",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="grey",this.critBorderColor="#E83737",this.critBkgColor="#E83737",this.taskTextDarkColor="calculated",this.todayLineColor="#DB5757",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.labelColor="calculated",this.errorBkgColor="#a44141",this.errorTextColor="#ddd"}updateColors(){var t,e,i,r,n,o,a,s,l,c,u;this.secondBkg=(0,g.Z)(this.mainBkg,16),this.lineColor=this.mainContrastColor,this.arrowheadColor=this.mainContrastColor,this.nodeBkg=this.mainBkg,this.nodeBorder=this.border1,this.clusterBkg=this.secondBkg,this.clusterBorder=this.border2,this.defaultLinkColor=this.lineColor,this.edgeLabelBackground=(0,g.Z)(this.labelBackground,25),this.actorBorder=this.border1,this.actorBkg=this.mainBkg,this.actorTextColor=this.mainContrastColor,this.actorLineColor=this.mainContrastColor,this.signalColor=this.mainContrastColor,this.signalTextColor=this.mainContrastColor,this.labelBoxBkgColor=this.actorBkg,this.labelBoxBorderColor=this.actorBorder,this.labelTextColor=this.mainContrastColor,this.loopTextColor=this.mainContrastColor,this.noteBorderColor=this.secondaryBorderColor,this.noteBkgColor=this.secondBkg,this.noteTextColor=this.secondaryTextColor,this.activationBorderColor=this.border1,this.activationBkgColor=this.secondBkg,this.altSectionBkgColor=this.background,this.taskBkgColor=(0,g.Z)(this.mainBkg,23),this.taskTextColor=this.darkTextColor,this.taskTextLightColor=this.mainContrastColor,this.taskTextOutsideColor=this.taskTextLightColor,this.gridColor=this.mainContrastColor,this.doneTaskBkgColor=this.mainContrastColor,this.taskTextDarkColor=this.darkTextColor,this.transitionColor=this.transitionColor||this.lineColor,this.transitionLabelColor=this.transitionLabelColor||this.textColor,this.stateLabelColor=this.stateLabelColor||this.stateBkg||this.primaryTextColor,this.stateBkg=this.stateBkg||this.mainBkg,this.labelBackgroundColor=this.labelBackgroundColor||this.stateBkg,this.compositeBackground=this.compositeBackground||this.background||this.tertiaryColor,this.altBackground=this.altBackground||"#555",this.compositeTitleBackground=this.compositeTitleBackground||this.mainBkg,this.compositeBorder=this.compositeBorder||this.nodeBorder,this.innerEndBackground=this.primaryBorderColor,this.specialStateColor="#f4f4f4",this.errorBkgColor=this.errorBkgColor||this.tertiaryColor,this.errorTextColor=this.errorTextColor||this.tertiaryTextColor,this.fillType0=this.primaryColor,this.fillType1=this.secondaryColor,this.fillType2=h(this.primaryColor,{h:64}),this.fillType3=h(this.secondaryColor,{h:64}),this.fillType4=h(this.primaryColor,{h:-64}),this.fillType5=h(this.secondaryColor,{h:-64}),this.fillType6=h(this.primaryColor,{h:128}),this.fillType7=h(this.secondaryColor,{h:128}),this.cScale1=this.cScale1||"#0b0000",this.cScale2=this.cScale2||"#4d1037",this.cScale3=this.cScale3||"#3f5258",this.cScale4=this.cScale4||"#4f2f1b",this.cScale5=this.cScale5||"#6e0a0a",this.cScale6=this.cScale6||"#3b0048",this.cScale7=this.cScale7||"#995a01",this.cScale8=this.cScale8||"#154706",this.cScale9=this.cScale9||"#161722",this.cScale10=this.cScale10||"#00296f",this.cScale11=this.cScale11||"#01629c",this.cScale12=this.cScale12||"#010029",this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||h(this.primaryColor,{h:30}),this.cScale4=this.cScale4||h(this.primaryColor,{h:60}),this.cScale5=this.cScale5||h(this.primaryColor,{h:90}),this.cScale6=this.cScale6||h(this.primaryColor,{h:120}),this.cScale7=this.cScale7||h(this.primaryColor,{h:150}),this.cScale8=this.cScale8||h(this.primaryColor,{h:210}),this.cScale9=this.cScale9||h(this.primaryColor,{h:270}),this.cScale10=this.cScale10||h(this.primaryColor,{h:300}),this.cScale11=this.cScale11||h(this.primaryColor,{h:330});for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleInv"+h]=this["cScaleInv"+h]||f(this["cScale"+h]);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScalePeer"+h]=this["cScalePeer"+h]||(0,g.Z)(this["cScale"+h],10);for(let d=0;d<5;d++)this["surface"+d]=this["surface"+d]||h(this.mainBkg,{h:30,s:-30,l:-(4*d-10)}),this["surfacePeer"+d]=this["surfacePeer"+d]||h(this.mainBkg,{h:30,s:-30,l:-(4*d-7)});this.scaleLabelColor=this.scaleLabelColor||(this.darkMode?"black":this.labelTextColor);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleLabel"+h]=this["cScaleLabel"+h]||this.scaleLabelColor;for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["pie"+h]=this["cScale"+h];this.pieTitleTextSize=this.pieTitleTextSize||"25px",this.pieTitleTextColor=this.pieTitleTextColor||this.taskTextDarkColor,this.pieSectionTextSize=this.pieSectionTextSize||"17px",this.pieSectionTextColor=this.pieSectionTextColor||this.textColor,this.pieLegendTextSize=this.pieLegendTextSize||"17px",this.pieLegendTextColor=this.pieLegendTextColor||this.taskTextDarkColor,this.pieStrokeColor=this.pieStrokeColor||"black",this.pieStrokeWidth=this.pieStrokeWidth||"2px",this.pieOuterStrokeWidth=this.pieOuterStrokeWidth||"2px",this.pieOuterStrokeColor=this.pieOuterStrokeColor||"black",this.pieOpacity=this.pieOpacity||"0.7",this.quadrant1Fill=this.quadrant1Fill||this.primaryColor,this.quadrant2Fill=this.quadrant2Fill||h(this.primaryColor,{r:5,g:5,b:5}),this.quadrant3Fill=this.quadrant3Fill||h(this.primaryColor,{r:10,g:10,b:10}),this.quadrant4Fill=this.quadrant4Fill||h(this.primaryColor,{r:15,g:15,b:15}),this.quadrant1TextFill=this.quadrant1TextFill||this.primaryTextColor,this.quadrant2TextFill=this.quadrant2TextFill||h(this.primaryTextColor,{r:-5,g:-5,b:-5}),this.quadrant3TextFill=this.quadrant3TextFill||h(this.primaryTextColor,{r:-10,g:-10,b:-10}),this.quadrant4TextFill=this.quadrant4TextFill||h(this.primaryTextColor,{r:-15,g:-15,b:-15}),this.quadrantPointFill=this.quadrantPointFill||(0,m.Z)(this.quadrant1Fill)?(0,g.Z)(this.quadrant1Fill):(0,p.Z)(this.quadrant1Fill),this.quadrantPointTextFill=this.quadrantPointTextFill||this.primaryTextColor,this.quadrantXAxisTextFill=this.quadrantXAxisTextFill||this.primaryTextColor,this.quadrantYAxisTextFill=this.quadrantYAxisTextFill||this.primaryTextColor,this.quadrantInternalBorderStrokeFill=this.quadrantInternalBorderStrokeFill||this.primaryBorderColor,this.quadrantExternalBorderStrokeFill=this.quadrantExternalBorderStrokeFill||this.primaryBorderColor,this.quadrantTitleFill=this.quadrantTitleFill||this.primaryTextColor,this.xyChart={backgroundColor:(null==(t=this.xyChart)?void 0:t.backgroundColor)||this.background,titleColor:(null==(e=this.xyChart)?void 0:e.titleColor)||this.primaryTextColor,xAxisTitleColor:(null==(i=this.xyChart)?void 0:i.xAxisTitleColor)||this.primaryTextColor,xAxisLabelColor:(null==(r=this.xyChart)?void 0:r.xAxisLabelColor)||this.primaryTextColor,xAxisTickColor:(null==(n=this.xyChart)?void 0:n.xAxisTickColor)||this.primaryTextColor,xAxisLineColor:(null==(o=this.xyChart)?void 0:o.xAxisLineColor)||this.primaryTextColor,yAxisTitleColor:(null==(a=this.xyChart)?void 0:a.yAxisTitleColor)||this.primaryTextColor,yAxisLabelColor:(null==(s=this.xyChart)?void 0:s.yAxisLabelColor)||this.primaryTextColor,yAxisTickColor:(null==(l=this.xyChart)?void 0:l.yAxisTickColor)||this.primaryTextColor,yAxisLineColor:(null==(c=this.xyChart)?void 0:c.yAxisLineColor)||this.primaryTextColor,plotColorPalette:(null==(u=this.xyChart)?void 0:u.plotColorPalette)||"#3498db,#2ecc71,#e74c3c,#f1c40f,#bdc3c7,#ffffff,#34495e,#9b59b6,#1abc9c,#e67e22"},this.classText=this.primaryTextColor,this.requirementBackground=this.requirementBackground||this.primaryColor,this.requirementBorderColor=this.requirementBorderColor||this.primaryBorderColor,this.requirementBorderSize=this.requirementBorderSize||"1",this.requirementTextColor=this.requirementTextColor||this.primaryTextColor,this.relationColor=this.relationColor||this.lineColor,this.relationLabelBackground=this.relationLabelBackground||(this.darkMode?(0,p.Z)(this.secondaryColor,30):this.secondaryColor),this.relationLabelColor=this.relationLabelColor||this.actorTextColor,this.git0=(0,g.Z)(this.secondaryColor,20),this.git1=(0,g.Z)(this.pie2||this.secondaryColor,20),this.git2=(0,g.Z)(this.pie3||this.tertiaryColor,20),this.git3=(0,g.Z)(this.pie4||h(this.primaryColor,{h:-30}),20),this.git4=(0,g.Z)(this.pie5||h(this.primaryColor,{h:-60}),20),this.git5=(0,g.Z)(this.pie6||h(this.primaryColor,{h:-90}),10),this.git6=(0,g.Z)(this.pie7||h(this.primaryColor,{h:60}),10),this.git7=(0,g.Z)(this.pie8||h(this.primaryColor,{h:120}),20),this.gitInv0=this.gitInv0||f(this.git0),this.gitInv1=this.gitInv1||f(this.git1),this.gitInv2=this.gitInv2||f(this.git2),this.gitInv3=this.gitInv3||f(this.git3),this.gitInv4=this.gitInv4||f(this.git4),this.gitInv5=this.gitInv5||f(this.git5),this.gitInv6=this.gitInv6||f(this.git6),this.gitInv7=this.gitInv7||f(this.git7),this.gitBranchLabel0=this.gitBranchLabel0||f(this.labelTextColor),this.gitBranchLabel1=this.gitBranchLabel1||this.labelTextColor,this.gitBranchLabel2=this.gitBranchLabel2||this.labelTextColor,this.gitBranchLabel3=this.gitBranchLabel3||f(this.labelTextColor),this.gitBranchLabel4=this.gitBranchLabel4||this.labelTextColor,this.gitBranchLabel5=this.gitBranchLabel5||this.labelTextColor,this.gitBranchLabel6=this.gitBranchLabel6||this.labelTextColor,this.gitBranchLabel7=this.gitBranchLabel7||this.labelTextColor,this.tagLabelColor=this.tagLabelColor||this.primaryTextColor,this.tagLabelBackground=this.tagLabelBackground||this.primaryColor,this.tagLabelBorder=this.tagBorder||this.primaryBorderColor,this.tagLabelFontSize=this.tagLabelFontSize||"10px",this.commitLabelColor=this.commitLabelColor||this.secondaryTextColor,this.commitLabelBackground=this.commitLabelBackground||this.secondaryColor,this.commitLabelFontSize=this.commitLabelFontSize||"10px",this.attributeBackgroundColorOdd=this.attributeBackgroundColorOdd||(0,g.Z)(this.background,12),this.attributeBackgroundColorEven=this.attributeBackgroundColorEven||(0,g.Z)(this.background,2)}calculate(t){if("object"!=typeof t)return void this.updateColors();const e=Object.keys(t);e.forEach((e=>{this[e]=t[e]})),this.updateColors(),e.forEach((e=>{this[e]=t[e]}))}};let Bt=class{constructor(){this.background="#f4f4f4",this.primaryColor="#ECECFF",this.secondaryColor=h(this.primaryColor,{h:120}),this.secondaryColor="#ffffde",this.tertiaryColor=h(this.primaryColor,{h:-160}),this.primaryBorderColor=vt(this.primaryColor,this.darkMode),this.secondaryBorderColor=vt(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=vt(this.tertiaryColor,this.darkMode),this.primaryTextColor=f(this.primaryColor),this.secondaryTextColor=f(this.secondaryColor),this.tertiaryTextColor=f(this.tertiaryColor),this.lineColor=f(this.background),this.textColor=f(this.background),this.background="white",this.mainBkg="#ECECFF",this.secondBkg="#ffffde",this.lineColor="#333333",this.border1="#9370DB",this.border2="#aaaa33",this.arrowheadColor="#333333",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.labelBackground="#e8e8e8",this.textColor="#333",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="calculated",this.edgeLabelBackground="calculated",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="black",this.actorLineColor="grey",this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="calculated",this.altSectionBkgColor="calculated",this.sectionBkgColor2="calculated",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="calculated",this.taskTextLightColor="calculated",this.taskTextColor=this.taskTextLightColor,this.taskTextDarkColor="calculated",this.taskTextOutsideColor=this.taskTextDarkColor,this.taskTextClickableColor="calculated",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="calculated",this.critBorderColor="calculated",this.critBkgColor="calculated",this.todayLineColor="calculated",this.sectionBkgColor=(0,u.Z)(102,102,255,.49),this.altSectionBkgColor="white",this.sectionBkgColor2="#fff400",this.taskBorderColor="#534fbc",this.taskBkgColor="#8a90dd",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="black",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="#534fbc",this.activeTaskBkgColor="#bfc7ff",this.gridColor="lightgrey",this.doneTaskBkgColor="lightgrey",this.doneTaskBorderColor="grey",this.critBorderColor="#ff8888",this.critBkgColor="red",this.todayLineColor="red",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222",this.updateColors()}updateColors(){var t,e,i,r,n,o,a,s,l,c,u;this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||h(this.primaryColor,{h:30}),this.cScale4=this.cScale4||h(this.primaryColor,{h:60}),this.cScale5=this.cScale5||h(this.primaryColor,{h:90}),this.cScale6=this.cScale6||h(this.primaryColor,{h:120}),this.cScale7=this.cScale7||h(this.primaryColor,{h:150}),this.cScale8=this.cScale8||h(this.primaryColor,{h:210}),this.cScale9=this.cScale9||h(this.primaryColor,{h:270}),this.cScale10=this.cScale10||h(this.primaryColor,{h:300}),this.cScale11=this.cScale11||h(this.primaryColor,{h:330}),this.cScalePeer1=this.cScalePeer1||(0,p.Z)(this.secondaryColor,45),this.cScalePeer2=this.cScalePeer2||(0,p.Z)(this.tertiaryColor,40);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScale"+h]=(0,p.Z)(this["cScale"+h],10),this["cScalePeer"+h]=this["cScalePeer"+h]||(0,p.Z)(this["cScale"+h],25);for(let d=0;d<this.THEME_COLOR_LIMIT;d++)this["cScaleInv"+d]=this["cScaleInv"+d]||h(this["cScale"+d],{h:180});for(let d=0;d<5;d++)this["surface"+d]=this["surface"+d]||h(this.mainBkg,{h:30,l:-(5+5*d)}),this["surfacePeer"+d]=this["surfacePeer"+d]||h(this.mainBkg,{h:30,l:-(7+5*d)});if(this.scaleLabelColor="calculated"!==this.scaleLabelColor&&this.scaleLabelColor?this.scaleLabelColor:this.labelTextColor,"calculated"!==this.labelTextColor){this.cScaleLabel0=this.cScaleLabel0||f(this.labelTextColor),this.cScaleLabel3=this.cScaleLabel3||f(this.labelTextColor);for(let t=0;t<this.THEME_COLOR_LIMIT;t++)this["cScaleLabel"+t]=this["cScaleLabel"+t]||this.labelTextColor}this.nodeBkg=this.mainBkg,this.nodeBorder=this.border1,this.clusterBkg=this.secondBkg,this.clusterBorder=this.border2,this.defaultLinkColor=this.lineColor,this.titleColor=this.textColor,this.edgeLabelBackground=this.labelBackground,this.actorBorder=(0,g.Z)(this.border1,23),this.actorBkg=this.mainBkg,this.labelBoxBkgColor=this.actorBkg,this.signalColor=this.textColor,this.signalTextColor=this.textColor,this.labelBoxBorderColor=this.actorBorder,this.labelTextColor=this.actorTextColor,this.loopTextColor=this.actorTextColor,this.noteBorderColor=this.border2,this.noteTextColor=this.actorTextColor,this.taskTextColor=this.taskTextLightColor,this.taskTextOutsideColor=this.taskTextDarkColor,this.transitionColor=this.transitionColor||this.lineColor,this.transitionLabelColor=this.transitionLabelColor||this.textColor,this.stateLabelColor=this.stateLabelColor||this.stateBkg||this.primaryTextColor,this.stateBkg=this.stateBkg||this.mainBkg,this.labelBackgroundColor=this.labelBackgroundColor||this.stateBkg,this.compositeBackground=this.compositeBackground||this.background||this.tertiaryColor,this.altBackground=this.altBackground||"#f0f0f0",this.compositeTitleBackground=this.compositeTitleBackground||this.mainBkg,this.compositeBorder=this.compositeBorder||this.nodeBorder,this.innerEndBackground=this.nodeBorder,this.specialStateColor=this.lineColor,this.errorBkgColor=this.errorBkgColor||this.tertiaryColor,this.errorTextColor=this.errorTextColor||this.tertiaryTextColor,this.transitionColor=this.transitionColor||this.lineColor,this.classText=this.primaryTextColor,this.fillType0=this.primaryColor,this.fillType1=this.secondaryColor,this.fillType2=h(this.primaryColor,{h:64}),this.fillType3=h(this.secondaryColor,{h:64}),this.fillType4=h(this.primaryColor,{h:-64}),this.fillType5=h(this.secondaryColor,{h:-64}),this.fillType6=h(this.primaryColor,{h:128}),this.fillType7=h(this.secondaryColor,{h:128}),this.pie1=this.pie1||this.primaryColor,this.pie2=this.pie2||this.secondaryColor,this.pie3=this.pie3||h(this.tertiaryColor,{l:-40}),this.pie4=this.pie4||h(this.primaryColor,{l:-10}),this.pie5=this.pie5||h(this.secondaryColor,{l:-30}),this.pie6=this.pie6||h(this.tertiaryColor,{l:-20}),this.pie7=this.pie7||h(this.primaryColor,{h:60,l:-20}),this.pie8=this.pie8||h(this.primaryColor,{h:-60,l:-40}),this.pie9=this.pie9||h(this.primaryColor,{h:120,l:-40}),this.pie10=this.pie10||h(this.primaryColor,{h:60,l:-40}),this.pie11=this.pie11||h(this.primaryColor,{h:-90,l:-40}),this.pie12=this.pie12||h(this.primaryColor,{h:120,l:-30}),this.pieTitleTextSize=this.pieTitleTextSize||"25px",this.pieTitleTextColor=this.pieTitleTextColor||this.taskTextDarkColor,this.pieSectionTextSize=this.pieSectionTextSize||"17px",this.pieSectionTextColor=this.pieSectionTextColor||this.textColor,this.pieLegendTextSize=this.pieLegendTextSize||"17px",this.pieLegendTextColor=this.pieLegendTextColor||this.taskTextDarkColor,this.pieStrokeColor=this.pieStrokeColor||"black",this.pieStrokeWidth=this.pieStrokeWidth||"2px",this.pieOuterStrokeWidth=this.pieOuterStrokeWidth||"2px",this.pieOuterStrokeColor=this.pieOuterStrokeColor||"black",this.pieOpacity=this.pieOpacity||"0.7",this.quadrant1Fill=this.quadrant1Fill||this.primaryColor,this.quadrant2Fill=this.quadrant2Fill||h(this.primaryColor,{r:5,g:5,b:5}),this.quadrant3Fill=this.quadrant3Fill||h(this.primaryColor,{r:10,g:10,b:10}),this.quadrant4Fill=this.quadrant4Fill||h(this.primaryColor,{r:15,g:15,b:15}),this.quadrant1TextFill=this.quadrant1TextFill||this.primaryTextColor,this.quadrant2TextFill=this.quadrant2TextFill||h(this.primaryTextColor,{r:-5,g:-5,b:-5}),this.quadrant3TextFill=this.quadrant3TextFill||h(this.primaryTextColor,{r:-10,g:-10,b:-10}),this.quadrant4TextFill=this.quadrant4TextFill||h(this.primaryTextColor,{r:-15,g:-15,b:-15}),this.quadrantPointFill=this.quadrantPointFill||(0,m.Z)(this.quadrant1Fill)?(0,g.Z)(this.quadrant1Fill):(0,p.Z)(this.quadrant1Fill),this.quadrantPointTextFill=this.quadrantPointTextFill||this.primaryTextColor,this.quadrantXAxisTextFill=this.quadrantXAxisTextFill||this.primaryTextColor,this.quadrantYAxisTextFill=this.quadrantYAxisTextFill||this.primaryTextColor,this.quadrantInternalBorderStrokeFill=this.quadrantInternalBorderStrokeFill||this.primaryBorderColor,this.quadrantExternalBorderStrokeFill=this.quadrantExternalBorderStrokeFill||this.primaryBorderColor,this.quadrantTitleFill=this.quadrantTitleFill||this.primaryTextColor,this.xyChart={backgroundColor:(null==(t=this.xyChart)?void 0:t.backgroundColor)||this.background,titleColor:(null==(e=this.xyChart)?void 0:e.titleColor)||this.primaryTextColor,xAxisTitleColor:(null==(i=this.xyChart)?void 0:i.xAxisTitleColor)||this.primaryTextColor,xAxisLabelColor:(null==(r=this.xyChart)?void 0:r.xAxisLabelColor)||this.primaryTextColor,xAxisTickColor:(null==(n=this.xyChart)?void 0:n.xAxisTickColor)||this.primaryTextColor,xAxisLineColor:(null==(o=this.xyChart)?void 0:o.xAxisLineColor)||this.primaryTextColor,yAxisTitleColor:(null==(a=this.xyChart)?void 0:a.yAxisTitleColor)||this.primaryTextColor,yAxisLabelColor:(null==(s=this.xyChart)?void 0:s.yAxisLabelColor)||this.primaryTextColor,yAxisTickColor:(null==(l=this.xyChart)?void 0:l.yAxisTickColor)||this.primaryTextColor,yAxisLineColor:(null==(c=this.xyChart)?void 0:c.yAxisLineColor)||this.primaryTextColor,plotColorPalette:(null==(u=this.xyChart)?void 0:u.plotColorPalette)||"#ECECFF,#8493A6,#FFC3A0,#DCDDE1,#B8E994,#D1A36F,#C3CDE6,#FFB6C1,#496078,#F8F3E3"},this.requirementBackground=this.requirementBackground||this.primaryColor,this.requirementBorderColor=this.requirementBorderColor||this.primaryBorderColor,this.requirementBorderSize=this.requirementBorderSize||"1",this.requirementTextColor=this.requirementTextColor||this.primaryTextColor,this.relationColor=this.relationColor||this.lineColor,this.relationLabelBackground=this.relationLabelBackground||this.labelBackground,this.relationLabelColor=this.relationLabelColor||this.actorTextColor,this.git0=this.git0||this.primaryColor,this.git1=this.git1||this.secondaryColor,this.git2=this.git2||this.tertiaryColor,this.git3=this.git3||h(this.primaryColor,{h:-30}),this.git4=this.git4||h(this.primaryColor,{h:-60}),this.git5=this.git5||h(this.primaryColor,{h:-90}),this.git6=this.git6||h(this.primaryColor,{h:60}),this.git7=this.git7||h(this.primaryColor,{h:120}),this.darkMode?(this.git0=(0,g.Z)(this.git0,25),this.git1=(0,g.Z)(this.git1,25),this.git2=(0,g.Z)(this.git2,25),this.git3=(0,g.Z)(this.git3,25),this.git4=(0,g.Z)(this.git4,25),this.git5=(0,g.Z)(this.git5,25),this.git6=(0,g.Z)(this.git6,25),this.git7=(0,g.Z)(this.git7,25)):(this.git0=(0,p.Z)(this.git0,25),this.git1=(0,p.Z)(this.git1,25),this.git2=(0,p.Z)(this.git2,25),this.git3=(0,p.Z)(this.git3,25),this.git4=(0,p.Z)(this.git4,25),this.git5=(0,p.Z)(this.git5,25),this.git6=(0,p.Z)(this.git6,25),this.git7=(0,p.Z)(this.git7,25)),this.gitInv0=this.gitInv0||(0,p.Z)(f(this.git0),25),this.gitInv1=this.gitInv1||f(this.git1),this.gitInv2=this.gitInv2||f(this.git2),this.gitInv3=this.gitInv3||f(this.git3),this.gitInv4=this.gitInv4||f(this.git4),this.gitInv5=this.gitInv5||f(this.git5),this.gitInv6=this.gitInv6||f(this.git6),this.gitInv7=this.gitInv7||f(this.git7),this.gitBranchLabel0=this.gitBranchLabel0||f(this.labelTextColor),this.gitBranchLabel1=this.gitBranchLabel1||this.labelTextColor,this.gitBranchLabel2=this.gitBranchLabel2||this.labelTextColor,this.gitBranchLabel3=this.gitBranchLabel3||f(this.labelTextColor),this.gitBranchLabel4=this.gitBranchLabel4||this.labelTextColor,this.gitBranchLabel5=this.gitBranchLabel5||this.labelTextColor,this.gitBranchLabel6=this.gitBranchLabel6||this.labelTextColor,this.gitBranchLabel7=this.gitBranchLabel7||this.labelTextColor,this.tagLabelColor=this.tagLabelColor||this.primaryTextColor,this.tagLabelBackground=this.tagLabelBackground||this.primaryColor,this.tagLabelBorder=this.tagBorder||this.primaryBorderColor,this.tagLabelFontSize=this.tagLabelFontSize||"10px",this.commitLabelColor=this.commitLabelColor||this.secondaryTextColor,this.commitLabelBackground=this.commitLabelBackground||this.secondaryColor,this.commitLabelFontSize=this.commitLabelFontSize||"10px",this.attributeBackgroundColorOdd=this.attributeBackgroundColorOdd||kt,this.attributeBackgroundColorEven=this.attributeBackgroundColorEven||Tt}calculate(t){if("object"!=typeof t)return void this.updateColors();const e=Object.keys(t);e.forEach((e=>{this[e]=t[e]})),this.updateColors(),e.forEach((e=>{this[e]=t[e]}))}};const Ft=t=>{const e=new Bt;return e.calculate(t),e};let At=class{constructor(){this.background="#f4f4f4",this.primaryColor="#cde498",this.secondaryColor="#cdffb2",this.background="white",this.mainBkg="#cde498",this.secondBkg="#cdffb2",this.lineColor="green",this.border1="#13540c",this.border2="#6eaa49",this.arrowheadColor="green",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.tertiaryColor=(0,g.Z)("#cde498",10),this.primaryBorderColor=vt(this.primaryColor,this.darkMode),this.secondaryBorderColor=vt(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=vt(this.tertiaryColor,this.darkMode),this.primaryTextColor=f(this.primaryColor),this.secondaryTextColor=f(this.secondaryColor),this.tertiaryTextColor=f(this.primaryColor),this.lineColor=f(this.background),this.textColor=f(this.background),this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="#333",this.edgeLabelBackground="#e8e8e8",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="black",this.actorLineColor="grey",this.signalColor="#333",this.signalTextColor="#333",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="#326932",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="#6eaa49",this.altSectionBkgColor="white",this.sectionBkgColor2="#6eaa49",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="#487e3a",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="black",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="lightgrey",this.doneTaskBkgColor="lightgrey",this.doneTaskBorderColor="grey",this.critBorderColor="#ff8888",this.critBkgColor="red",this.todayLineColor="red",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222"}updateColors(){var t,e,i,r,n,o,a,s,l,c,u;this.actorBorder=(0,p.Z)(this.mainBkg,20),this.actorBkg=this.mainBkg,this.labelBoxBkgColor=this.actorBkg,this.labelTextColor=this.actorTextColor,this.loopTextColor=this.actorTextColor,this.noteBorderColor=this.border2,this.noteTextColor=this.actorTextColor,this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||h(this.primaryColor,{h:30}),this.cScale4=this.cScale4||h(this.primaryColor,{h:60}),this.cScale5=this.cScale5||h(this.primaryColor,{h:90}),this.cScale6=this.cScale6||h(this.primaryColor,{h:120}),this.cScale7=this.cScale7||h(this.primaryColor,{h:150}),this.cScale8=this.cScale8||h(this.primaryColor,{h:210}),this.cScale9=this.cScale9||h(this.primaryColor,{h:270}),this.cScale10=this.cScale10||h(this.primaryColor,{h:300}),this.cScale11=this.cScale11||h(this.primaryColor,{h:330}),this.cScalePeer1=this.cScalePeer1||(0,p.Z)(this.secondaryColor,45),this.cScalePeer2=this.cScalePeer2||(0,p.Z)(this.tertiaryColor,40);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScale"+h]=(0,p.Z)(this["cScale"+h],10),this["cScalePeer"+h]=this["cScalePeer"+h]||(0,p.Z)(this["cScale"+h],25);for(let d=0;d<this.THEME_COLOR_LIMIT;d++)this["cScaleInv"+d]=this["cScaleInv"+d]||h(this["cScale"+d],{h:180});this.scaleLabelColor="calculated"!==this.scaleLabelColor&&this.scaleLabelColor?this.scaleLabelColor:this.labelTextColor;for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleLabel"+h]=this["cScaleLabel"+h]||this.scaleLabelColor;for(let d=0;d<5;d++)this["surface"+d]=this["surface"+d]||h(this.mainBkg,{h:30,s:-30,l:-(5+5*d)}),this["surfacePeer"+d]=this["surfacePeer"+d]||h(this.mainBkg,{h:30,s:-30,l:-(8+5*d)});this.nodeBkg=this.mainBkg,this.nodeBorder=this.border1,this.clusterBkg=this.secondBkg,this.clusterBorder=this.border2,this.defaultLinkColor=this.lineColor,this.taskBorderColor=this.border1,this.taskTextColor=this.taskTextLightColor,this.taskTextOutsideColor=this.taskTextDarkColor,this.activeTaskBorderColor=this.taskBorderColor,this.activeTaskBkgColor=this.mainBkg,this.transitionColor=this.transitionColor||this.lineColor,this.transitionLabelColor=this.transitionLabelColor||this.textColor,this.stateLabelColor=this.stateLabelColor||this.stateBkg||this.primaryTextColor,this.stateBkg=this.stateBkg||this.mainBkg,this.labelBackgroundColor=this.labelBackgroundColor||this.stateBkg,this.compositeBackground=this.compositeBackground||this.background||this.tertiaryColor,this.altBackground=this.altBackground||"#f0f0f0",this.compositeTitleBackground=this.compositeTitleBackground||this.mainBkg,this.compositeBorder=this.compositeBorder||this.nodeBorder,this.innerEndBackground=this.primaryBorderColor,this.specialStateColor=this.lineColor,this.errorBkgColor=this.errorBkgColor||this.tertiaryColor,this.errorTextColor=this.errorTextColor||this.tertiaryTextColor,this.transitionColor=this.transitionColor||this.lineColor,this.classText=this.primaryTextColor,this.fillType0=this.primaryColor,this.fillType1=this.secondaryColor,this.fillType2=h(this.primaryColor,{h:64}),this.fillType3=h(this.secondaryColor,{h:64}),this.fillType4=h(this.primaryColor,{h:-64}),this.fillType5=h(this.secondaryColor,{h:-64}),this.fillType6=h(this.primaryColor,{h:128}),this.fillType7=h(this.secondaryColor,{h:128}),this.pie1=this.pie1||this.primaryColor,this.pie2=this.pie2||this.secondaryColor,this.pie3=this.pie3||this.tertiaryColor,this.pie4=this.pie4||h(this.primaryColor,{l:-30}),this.pie5=this.pie5||h(this.secondaryColor,{l:-30}),this.pie6=this.pie6||h(this.tertiaryColor,{h:40,l:-40}),this.pie7=this.pie7||h(this.primaryColor,{h:60,l:-10}),this.pie8=this.pie8||h(this.primaryColor,{h:-60,l:-10}),this.pie9=this.pie9||h(this.primaryColor,{h:120,l:0}),this.pie10=this.pie10||h(this.primaryColor,{h:60,l:-50}),this.pie11=this.pie11||h(this.primaryColor,{h:-60,l:-50}),this.pie12=this.pie12||h(this.primaryColor,{h:120,l:-50}),this.pieTitleTextSize=this.pieTitleTextSize||"25px",this.pieTitleTextColor=this.pieTitleTextColor||this.taskTextDarkColor,this.pieSectionTextSize=this.pieSectionTextSize||"17px",this.pieSectionTextColor=this.pieSectionTextColor||this.textColor,this.pieLegendTextSize=this.pieLegendTextSize||"17px",this.pieLegendTextColor=this.pieLegendTextColor||this.taskTextDarkColor,this.pieStrokeColor=this.pieStrokeColor||"black",this.pieStrokeWidth=this.pieStrokeWidth||"2px",this.pieOuterStrokeWidth=this.pieOuterStrokeWidth||"2px",this.pieOuterStrokeColor=this.pieOuterStrokeColor||"black",this.pieOpacity=this.pieOpacity||"0.7",this.quadrant1Fill=this.quadrant1Fill||this.primaryColor,this.quadrant2Fill=this.quadrant2Fill||h(this.primaryColor,{r:5,g:5,b:5}),this.quadrant3Fill=this.quadrant3Fill||h(this.primaryColor,{r:10,g:10,b:10}),this.quadrant4Fill=this.quadrant4Fill||h(this.primaryColor,{r:15,g:15,b:15}),this.quadrant1TextFill=this.quadrant1TextFill||this.primaryTextColor,this.quadrant2TextFill=this.quadrant2TextFill||h(this.primaryTextColor,{r:-5,g:-5,b:-5}),this.quadrant3TextFill=this.quadrant3TextFill||h(this.primaryTextColor,{r:-10,g:-10,b:-10}),this.quadrant4TextFill=this.quadrant4TextFill||h(this.primaryTextColor,{r:-15,g:-15,b:-15}),this.quadrantPointFill=this.quadrantPointFill||(0,m.Z)(this.quadrant1Fill)?(0,g.Z)(this.quadrant1Fill):(0,p.Z)(this.quadrant1Fill),this.quadrantPointTextFill=this.quadrantPointTextFill||this.primaryTextColor,this.quadrantXAxisTextFill=this.quadrantXAxisTextFill||this.primaryTextColor,this.quadrantYAxisTextFill=this.quadrantYAxisTextFill||this.primaryTextColor,this.quadrantInternalBorderStrokeFill=this.quadrantInternalBorderStrokeFill||this.primaryBorderColor,this.quadrantExternalBorderStrokeFill=this.quadrantExternalBorderStrokeFill||this.primaryBorderColor,this.quadrantTitleFill=this.quadrantTitleFill||this.primaryTextColor,this.xyChart={backgroundColor:(null==(t=this.xyChart)?void 0:t.backgroundColor)||this.background,titleColor:(null==(e=this.xyChart)?void 0:e.titleColor)||this.primaryTextColor,xAxisTitleColor:(null==(i=this.xyChart)?void 0:i.xAxisTitleColor)||this.primaryTextColor,xAxisLabelColor:(null==(r=this.xyChart)?void 0:r.xAxisLabelColor)||this.primaryTextColor,xAxisTickColor:(null==(n=this.xyChart)?void 0:n.xAxisTickColor)||this.primaryTextColor,xAxisLineColor:(null==(o=this.xyChart)?void 0:o.xAxisLineColor)||this.primaryTextColor,yAxisTitleColor:(null==(a=this.xyChart)?void 0:a.yAxisTitleColor)||this.primaryTextColor,yAxisLabelColor:(null==(s=this.xyChart)?void 0:s.yAxisLabelColor)||this.primaryTextColor,yAxisTickColor:(null==(l=this.xyChart)?void 0:l.yAxisTickColor)||this.primaryTextColor,yAxisLineColor:(null==(c=this.xyChart)?void 0:c.yAxisLineColor)||this.primaryTextColor,plotColorPalette:(null==(u=this.xyChart)?void 0:u.plotColorPalette)||"#CDE498,#FF6B6B,#A0D2DB,#D7BDE2,#F0F0F0,#FFC3A0,#7FD8BE,#FF9A8B,#FAF3E0,#FFF176"},this.requirementBackground=this.requirementBackground||this.primaryColor,this.requirementBorderColor=this.requirementBorderColor||this.primaryBorderColor,this.requirementBorderSize=this.requirementBorderSize||"1",this.requirementTextColor=this.requirementTextColor||this.primaryTextColor,this.relationColor=this.relationColor||this.lineColor,this.relationLabelBackground=this.relationLabelBackground||this.edgeLabelBackground,this.relationLabelColor=this.relationLabelColor||this.actorTextColor,this.git0=this.git0||this.primaryColor,this.git1=this.git1||this.secondaryColor,this.git2=this.git2||this.tertiaryColor,this.git3=this.git3||h(this.primaryColor,{h:-30}),this.git4=this.git4||h(this.primaryColor,{h:-60}),this.git5=this.git5||h(this.primaryColor,{h:-90}),this.git6=this.git6||h(this.primaryColor,{h:60}),this.git7=this.git7||h(this.primaryColor,{h:120}),this.darkMode?(this.git0=(0,g.Z)(this.git0,25),this.git1=(0,g.Z)(this.git1,25),this.git2=(0,g.Z)(this.git2,25),this.git3=(0,g.Z)(this.git3,25),this.git4=(0,g.Z)(this.git4,25),this.git5=(0,g.Z)(this.git5,25),this.git6=(0,g.Z)(this.git6,25),this.git7=(0,g.Z)(this.git7,25)):(this.git0=(0,p.Z)(this.git0,25),this.git1=(0,p.Z)(this.git1,25),this.git2=(0,p.Z)(this.git2,25),this.git3=(0,p.Z)(this.git3,25),this.git4=(0,p.Z)(this.git4,25),this.git5=(0,p.Z)(this.git5,25),this.git6=(0,p.Z)(this.git6,25),this.git7=(0,p.Z)(this.git7,25)),this.gitInv0=this.gitInv0||f(this.git0),this.gitInv1=this.gitInv1||f(this.git1),this.gitInv2=this.gitInv2||f(this.git2),this.gitInv3=this.gitInv3||f(this.git3),this.gitInv4=this.gitInv4||f(this.git4),this.gitInv5=this.gitInv5||f(this.git5),this.gitInv6=this.gitInv6||f(this.git6),this.gitInv7=this.gitInv7||f(this.git7),this.gitBranchLabel0=this.gitBranchLabel0||f(this.labelTextColor),this.gitBranchLabel1=this.gitBranchLabel1||this.labelTextColor,this.gitBranchLabel2=this.gitBranchLabel2||this.labelTextColor,this.gitBranchLabel3=this.gitBranchLabel3||f(this.labelTextColor),this.gitBranchLabel4=this.gitBranchLabel4||this.labelTextColor,this.gitBranchLabel5=this.gitBranchLabel5||this.labelTextColor,this.gitBranchLabel6=this.gitBranchLabel6||this.labelTextColor,this.gitBranchLabel7=this.gitBranchLabel7||this.labelTextColor,this.tagLabelColor=this.tagLabelColor||this.primaryTextColor,this.tagLabelBackground=this.tagLabelBackground||this.primaryColor,this.tagLabelBorder=this.tagBorder||this.primaryBorderColor,this.tagLabelFontSize=this.tagLabelFontSize||"10px",this.commitLabelColor=this.commitLabelColor||this.secondaryTextColor,this.commitLabelBackground=this.commitLabelBackground||this.secondaryColor,this.commitLabelFontSize=this.commitLabelFontSize||"10px",this.attributeBackgroundColorOdd=this.attributeBackgroundColorOdd||kt,this.attributeBackgroundColorEven=this.attributeBackgroundColorEven||Tt}calculate(t){if("object"!=typeof t)return void this.updateColors();const e=Object.keys(t);e.forEach((e=>{this[e]=t[e]})),this.updateColors(),e.forEach((e=>{this[e]=t[e]}))}};class Lt{constructor(){this.primaryColor="#eee",this.contrast="#707070",this.secondaryColor=(0,g.Z)(this.contrast,55),this.background="#ffffff",this.tertiaryColor=h(this.primaryColor,{h:-160}),this.primaryBorderColor=vt(this.primaryColor,this.darkMode),this.secondaryBorderColor=vt(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=vt(this.tertiaryColor,this.darkMode),this.primaryTextColor=f(this.primaryColor),this.secondaryTextColor=f(this.secondaryColor),this.tertiaryTextColor=f(this.tertiaryColor),this.lineColor=f(this.background),this.textColor=f(this.background),this.mainBkg="#eee",this.secondBkg="calculated",this.lineColor="#666",this.border1="#999",this.border2="calculated",this.note="#ffa",this.text="#333",this.critical="#d42",this.done="#bbb",this.arrowheadColor="#333333",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="calculated",this.edgeLabelBackground="white",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="calculated",this.actorLineColor="calculated",this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="calculated",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="calculated",this.altSectionBkgColor="white",this.sectionBkgColor2="calculated",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="calculated",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="calculated",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="calculated",this.critBkgColor="calculated",this.critBorderColor="calculated",this.todayLineColor="calculated",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222"}updateColors(){var t,e,i,r,n,o,a,s,l,c,u;this.secondBkg=(0,g.Z)(this.contrast,55),this.border2=this.contrast,this.actorBorder=(0,g.Z)(this.border1,23),this.actorBkg=this.mainBkg,this.actorTextColor=this.text,this.actorLineColor=this.lineColor,this.signalColor=this.text,this.signalTextColor=this.text,this.labelBoxBkgColor=this.actorBkg,this.labelBoxBorderColor=this.actorBorder,this.labelTextColor=this.text,this.loopTextColor=this.text,this.noteBorderColor="#999",this.noteBkgColor="#666",this.noteTextColor="#fff",this.cScale0=this.cScale0||"#555",this.cScale1=this.cScale1||"#F4F4F4",this.cScale2=this.cScale2||"#555",this.cScale3=this.cScale3||"#BBB",this.cScale4=this.cScale4||"#777",this.cScale5=this.cScale5||"#999",this.cScale6=this.cScale6||"#DDD",this.cScale7=this.cScale7||"#FFF",this.cScale8=this.cScale8||"#DDD",this.cScale9=this.cScale9||"#BBB",this.cScale10=this.cScale10||"#999",this.cScale11=this.cScale11||"#777";for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleInv"+h]=this["cScaleInv"+h]||f(this["cScale"+h]);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this.darkMode?this["cScalePeer"+h]=this["cScalePeer"+h]||(0,g.Z)(this["cScale"+h],10):this["cScalePeer"+h]=this["cScalePeer"+h]||(0,p.Z)(this["cScale"+h],10);this.scaleLabelColor=this.scaleLabelColor||(this.darkMode?"black":this.labelTextColor),this.cScaleLabel0=this.cScaleLabel0||this.cScale1,this.cScaleLabel2=this.cScaleLabel2||this.cScale1;for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleLabel"+h]=this["cScaleLabel"+h]||this.scaleLabelColor;for(let d=0;d<5;d++)this["surface"+d]=this["surface"+d]||h(this.mainBkg,{l:-(5+5*d)}),this["surfacePeer"+d]=this["surfacePeer"+d]||h(this.mainBkg,{l:-(8+5*d)});this.nodeBkg=this.mainBkg,this.nodeBorder=this.border1,this.clusterBkg=this.secondBkg,this.clusterBorder=this.border2,this.defaultLinkColor=this.lineColor,this.titleColor=this.text,this.sectionBkgColor=(0,g.Z)(this.contrast,30),this.sectionBkgColor2=(0,g.Z)(this.contrast,30),this.taskBorderColor=(0,p.Z)(this.contrast,10),this.taskBkgColor=this.contrast,this.taskTextColor=this.taskTextLightColor,this.taskTextDarkColor=this.text,this.taskTextOutsideColor=this.taskTextDarkColor,this.activeTaskBorderColor=this.taskBorderColor,this.activeTaskBkgColor=this.mainBkg,this.gridColor=(0,g.Z)(this.border1,30),this.doneTaskBkgColor=this.done,this.doneTaskBorderColor=this.lineColor,this.critBkgColor=this.critical,this.critBorderColor=(0,p.Z)(this.critBkgColor,10),this.todayLineColor=this.critBkgColor,this.transitionColor=this.transitionColor||"#000",this.transitionLabelColor=this.transitionLabelColor||this.textColor,this.stateLabelColor=this.stateLabelColor||this.stateBkg||this.primaryTextColor,this.stateBkg=this.stateBkg||this.mainBkg,this.labelBackgroundColor=this.labelBackgroundColor||this.stateBkg,this.compositeBackground=this.compositeBackground||this.background||this.tertiaryColor,this.altBackground=this.altBackground||"#f4f4f4",this.compositeTitleBackground=this.compositeTitleBackground||this.mainBkg,this.stateBorder=this.stateBorder||"#000",this.innerEndBackground=this.primaryBorderColor,this.specialStateColor="#222",this.errorBkgColor=this.errorBkgColor||this.tertiaryColor,this.errorTextColor=this.errorTextColor||this.tertiaryTextColor,this.classText=this.primaryTextColor,this.fillType0=this.primaryColor,this.fillType1=this.secondaryColor,this.fillType2=h(this.primaryColor,{h:64}),this.fillType3=h(this.secondaryColor,{h:64}),this.fillType4=h(this.primaryColor,{h:-64}),this.fillType5=h(this.secondaryColor,{h:-64}),this.fillType6=h(this.primaryColor,{h:128}),this.fillType7=h(this.secondaryColor,{h:128});for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["pie"+h]=this["cScale"+h];this.pie12=this.pie0,this.pieTitleTextSize=this.pieTitleTextSize||"25px",this.pieTitleTextColor=this.pieTitleTextColor||this.taskTextDarkColor,this.pieSectionTextSize=this.pieSectionTextSize||"17px",this.pieSectionTextColor=this.pieSectionTextColor||this.textColor,this.pieLegendTextSize=this.pieLegendTextSize||"17px",this.pieLegendTextColor=this.pieLegendTextColor||this.taskTextDarkColor,this.pieStrokeColor=this.pieStrokeColor||"black",this.pieStrokeWidth=this.pieStrokeWidth||"2px",this.pieOuterStrokeWidth=this.pieOuterStrokeWidth||"2px",this.pieOuterStrokeColor=this.pieOuterStrokeColor||"black",this.pieOpacity=this.pieOpacity||"0.7",this.quadrant1Fill=this.quadrant1Fill||this.primaryColor,this.quadrant2Fill=this.quadrant2Fill||h(this.primaryColor,{r:5,g:5,b:5}),this.quadrant3Fill=this.quadrant3Fill||h(this.primaryColor,{r:10,g:10,b:10}),this.quadrant4Fill=this.quadrant4Fill||h(this.primaryColor,{r:15,g:15,b:15}),this.quadrant1TextFill=this.quadrant1TextFill||this.primaryTextColor,this.quadrant2TextFill=this.quadrant2TextFill||h(this.primaryTextColor,{r:-5,g:-5,b:-5}),this.quadrant3TextFill=this.quadrant3TextFill||h(this.primaryTextColor,{r:-10,g:-10,b:-10}),this.quadrant4TextFill=this.quadrant4TextFill||h(this.primaryTextColor,{r:-15,g:-15,b:-15}),this.quadrantPointFill=this.quadrantPointFill||(0,m.Z)(this.quadrant1Fill)?(0,g.Z)(this.quadrant1Fill):(0,p.Z)(this.quadrant1Fill),this.quadrantPointTextFill=this.quadrantPointTextFill||this.primaryTextColor,this.quadrantXAxisTextFill=this.quadrantXAxisTextFill||this.primaryTextColor,this.quadrantYAxisTextFill=this.quadrantYAxisTextFill||this.primaryTextColor,this.quadrantInternalBorderStrokeFill=this.quadrantInternalBorderStrokeFill||this.primaryBorderColor,this.quadrantExternalBorderStrokeFill=this.quadrantExternalBorderStrokeFill||this.primaryBorderColor,this.quadrantTitleFill=this.quadrantTitleFill||this.primaryTextColor,this.xyChart={backgroundColor:(null==(t=this.xyChart)?void 0:t.backgroundColor)||this.background,titleColor:(null==(e=this.xyChart)?void 0:e.titleColor)||this.primaryTextColor,xAxisTitleColor:(null==(i=this.xyChart)?void 0:i.xAxisTitleColor)||this.primaryTextColor,xAxisLabelColor:(null==(r=this.xyChart)?void 0:r.xAxisLabelColor)||this.primaryTextColor,xAxisTickColor:(null==(n=this.xyChart)?void 0:n.xAxisTickColor)||this.primaryTextColor,xAxisLineColor:(null==(o=this.xyChart)?void 0:o.xAxisLineColor)||this.primaryTextColor,yAxisTitleColor:(null==(a=this.xyChart)?void 0:a.yAxisTitleColor)||this.primaryTextColor,yAxisLabelColor:(null==(s=this.xyChart)?void 0:s.yAxisLabelColor)||this.primaryTextColor,yAxisTickColor:(null==(l=this.xyChart)?void 0:l.yAxisTickColor)||this.primaryTextColor,yAxisLineColor:(null==(c=this.xyChart)?void 0:c.yAxisLineColor)||this.primaryTextColor,plotColorPalette:(null==(u=this.xyChart)?void 0:u.plotColorPalette)||"#EEE,#6BB8E4,#8ACB88,#C7ACD6,#E8DCC2,#FFB2A8,#FFF380,#7E8D91,#FFD8B1,#FAF3E0"},this.requirementBackground=this.requirementBackground||this.primaryColor,this.requirementBorderColor=this.requirementBorderColor||this.primaryBorderColor,this.requirementBorderSize=this.requirementBorderSize||"1",this.requirementTextColor=this.requirementTextColor||this.primaryTextColor,this.relationColor=this.relationColor||this.lineColor,this.relationLabelBackground=this.relationLabelBackground||this.edgeLabelBackground,this.relationLabelColor=this.relationLabelColor||this.actorTextColor,this.git0=(0,p.Z)(this.pie1,25)||this.primaryColor,this.git1=this.pie2||this.secondaryColor,this.git2=this.pie3||this.tertiaryColor,this.git3=this.pie4||h(this.primaryColor,{h:-30}),this.git4=this.pie5||h(this.primaryColor,{h:-60}),this.git5=this.pie6||h(this.primaryColor,{h:-90}),this.git6=this.pie7||h(this.primaryColor,{h:60}),this.git7=this.pie8||h(this.primaryColor,{h:120}),this.gitInv0=this.gitInv0||f(this.git0),this.gitInv1=this.gitInv1||f(this.git1),this.gitInv2=this.gitInv2||f(this.git2),this.gitInv3=this.gitInv3||f(this.git3),this.gitInv4=this.gitInv4||f(this.git4),this.gitInv5=this.gitInv5||f(this.git5),this.gitInv6=this.gitInv6||f(this.git6),this.gitInv7=this.gitInv7||f(this.git7),this.branchLabelColor=this.branchLabelColor||this.labelTextColor,this.gitBranchLabel0=this.branchLabelColor,this.gitBranchLabel1="white",this.gitBranchLabel2=this.branchLabelColor,this.gitBranchLabel3="white",this.gitBranchLabel4=this.branchLabelColor,this.gitBranchLabel5=this.branchLabelColor,this.gitBranchLabel6=this.branchLabelColor,this.gitBranchLabel7=this.branchLabelColor,this.tagLabelColor=this.tagLabelColor||this.primaryTextColor,this.tagLabelBackground=this.tagLabelBackground||this.primaryColor,this.tagLabelBorder=this.tagBorder||this.primaryBorderColor,this.tagLabelFontSize=this.tagLabelFontSize||"10px",this.commitLabelColor=this.commitLabelColor||this.secondaryTextColor,this.commitLabelBackground=this.commitLabelBackground||this.secondaryColor,this.commitLabelFontSize=this.commitLabelFontSize||"10px",this.attributeBackgroundColorOdd=this.attributeBackgroundColorOdd||kt,this.attributeBackgroundColorEven=this.attributeBackgroundColorEven||Tt}calculate(t){if("object"!=typeof t)return void this.updateColors();const e=Object.keys(t);e.forEach((e=>{this[e]=t[e]})),this.updateColors(),e.forEach((e=>{this[e]=t[e]}))}}const Mt={base:{getThemeVariables:t=>{const e=new wt;return e.calculate(t),e}},dark:{getThemeVariables:t=>{const e=new St;return e.calculate(t),e}},default:{getThemeVariables:Ft},forest:{getThemeVariables:t=>{const e=new At;return e.calculate(t),e}},neutral:{getThemeVariables:t=>{const e=new Lt;return e.calculate(t),e}}},Et={flowchart:{useMaxWidth:!0,titleTopMargin:25,diagramPadding:8,htmlLabels:!0,nodeSpacing:50,rankSpacing:50,curve:"basis",padding:15,defaultRenderer:"dagre-wrapper",wrappingWidth:200},sequence:{useMaxWidth:!0,hideUnusedParticipants:!1,activationWidth:10,diagramMarginX:50,diagramMarginY:10,actorMargin:50,width:150,height:65,boxMargin:10,boxTextMargin:5,noteMargin:10,messageMargin:35,messageAlign:"center",mirrorActors:!0,forceMenus:!1,bottomMarginAdj:1,rightAngles:!1,showSequenceNumbers:!1,actorFontSize:14,actorFontFamily:'"Open 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Therefore try to follow this succession of steps:"}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsx)(n.li,{children:"Try to reproduce the bug."}),"\n",(0,s.jsx)(n.li,{children:"Create a test that proves the presence of the bug."}),"\n",(0,s.jsx)(n.li,{children:"Fix the bug."}),"\n"]}),"\n",(0,s.jsxs)(n.p,{children:["In case you are submitting the bonus via GitLab, it is helpful to commit tests\nbefore commiting the fixes, so that it is apparent that the bug is manifested.\nExample of ",(0,s.jsx)(n.code,{children:"git log"})," (notice that the first line represents latest commit):"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{children:"feat: Implement fizz_buzzer\ntest: Add tests for fizz_buzzer\nfix: Fix NULL-check in print_name\ntest: Add test for NULL in print_name\n"})}),"\n",(0,s.jsx)(n.h2,{id:"tasks",children:"Tasks"}),"\n",(0,s.jsx)(n.p,{children:"As to your tasks, there are multiple things wrong in this project."}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsx)(n.p,{children:'There are 2 "bugs" that cannot be detected via tests, i.e. they are not bugs\nthat affect functionality of the game.'}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["There is one evil bug in ",(0,s.jsx)(n.code,{children:"get_word"}),". It is not required to be fixed ;) Assign\nit the lowest priority."]}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsx)(n.p,{children:"There are some tests failing. Please try to figure it out, so you have green\ntests for the rest :)"}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["We have gotten a bug report for ",(0,s.jsx)(n.code,{children:"word_guessed"}),", all we got is"]}),"\n",(0,s.jsxs)(n.blockquote,{children:["\n",(0,s.jsxs)(n.p,{children:["doesn't work when there are too many ",(0,s.jsx)(n.code,{children:"a"}),"s"]}),"\n"]}),"\n",(0,s.jsx)(n.p,{children:"Please try to replicate the bug and create a tests, so we don't get any\nregression later on."}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsx)(n.p,{children:"One hidden bug :) Closely non-specified, we cannot reproduce it and we were\ndrunk while playing the game, so we don't remember a thing. :/"}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsx)(n.p,{children:"Try to cover as much code via the tests as possible. We are not going to look\nat the metrics, but DRY is violated a lot, so as a last task try to remove as\nmuch of the duplicit code as possible."}),"\n",(0,s.jsx)(n.p,{children:"Tests should help you a lot in case there are some regressions."}),"\n"]}),"\n"]}),"\n",(0,s.jsx)(n.hr,{}),"\n",(0,s.jsxs)(n.p,{children:["In case you wonder why there are always 3 same words in the file with words, it\nis because of the ",(0,s.jsx)(n.code,{children:"get_word"})," bug. It is not a bug that can be easily fixed, so\nit is a not requirement at all and you can still get all points for the bonus ;)"]}),"\n",(0,s.jsx)(n.h2,{id:"dictionary",children:"Dictionary"}),"\n",(0,s.jsxs)(n.ul,{children:["\n",(0,s.jsx)(n.li,{children:(0,s.jsx)(n.a,{href:"https://en.wikipedia.org/wiki/Functional_testing",children:"Functional tests"})}),"\n",(0,s.jsx)(n.li,{children:(0,s.jsx)(n.a,{href:"https://en.wikipedia.org/wiki/Smoke_testing_%28software%29",children:"Smoke test"})}),"\n",(0,s.jsx)(n.li,{children:(0,s.jsx)(n.a,{href:"https://en.wikipedia.org/wiki/Don%27t_repeat_yourself",children:"DRY"})}),"\n"]}),"\n",(0,s.jsx)(n.h2,{id:"submitting",children:"Submitting"}),"\n",(0,s.jsx)(n.p,{children:"In case you have any questions, feel free to reach out to me."}),"\n",(0,s.jsx)(n.hr,{})]})}function h(e={}){const{wrapper:n}={...(0,i.a)(),...e.components};return n?(0,s.jsx)(n,{...e,children:(0,s.jsx)(d,{...e})}):d(e)}},27420:(e,n,t)=>{t.d(n,{Z:()=>s});const s=t.p+"assets/images/tdd_lifecycle-327ad9ee0ed8318ed11e19a28e02b2cc.png"},11151:(e,n,t)=>{t.d(n,{Z:()=>a,a:()=>o});var s=t(67294);const i={},r=s.createContext(i);function o(e){const n=s.useContext(r);return s.useMemo((function(){return"function"==typeof e?e(n):{...n,...e}}),[n,e])}function a(e){let n;return n=e.disableParentContext?"function"==typeof e.components?e.components(i):e.components||i:o(e.components),s.createElement(r.Provider,{value:n},e.children)}}}]); \ No newline at end of file diff --git a/assets/js/1535ede8.cf110382.js b/assets/js/1535ede8.cf110382.js new file mode 100644 index 0000000..29a4c79 --- /dev/null +++ b/assets/js/1535ede8.cf110382.js @@ -0,0 +1 @@ +"use strict";(self.webpackChunkfi=self.webpackChunkfi||[]).push([[5376],{44969:(e,n,t)=>{t.r(n),t.d(n,{assets:()=>c,contentTitle:()=>o,default:()=>h,frontMatter:()=>r,metadata:()=>a,toc:()=>l});var s=t(85893),i=t(11151);const r={id:"seminar-10",title:"10th seminar",description:"Finding bugs in a hangman.\n"},o=void 0,a={id:"bonuses/seminar-10",title:"10th seminar",description:"Finding bugs in a hangman.\n",source:"@site/c/bonuses/10.md",sourceDirName:"bonuses",slug:"/bonuses/seminar-10",permalink:"/c/bonuses/seminar-10",draft:!1,unlisted:!1,editUrl:"https://github.com/mfocko/blog/tree/main/c/bonuses/10.md",tags:[],version:"current",lastUpdatedAt:1706528814,formattedLastUpdatedAt:"Jan 29, 2024",frontMatter:{id:"seminar-10",title:"10th seminar",description:"Finding bugs in a hangman.\n"},sidebar:"autogeneratedBar",previous:{title:"8th seminar",permalink:"/c/bonuses/seminar-08"},next:{title:"Practice Exams",permalink:"/c/category/practice-exams"}},c={},l=[{value:"Introduction",id:"introduction",level:2},{value:"Project",id:"project",level:2},{value:"Summary of the gameplay",id:"summary-of-the-gameplay",level:3},{value:"Suggested workflow",id:"suggested-workflow",level:2},{value:"Tasks",id:"tasks",level:2},{value:"Dictionary",id:"dictionary",level:2},{value:"Submitting",id:"submitting",level:2}];function d(e){const n={a:"a",blockquote:"blockquote",code:"code",em:"em",h2:"h2",h3:"h3",hr:"hr",img:"img",li:"li",ol:"ol",p:"p",pre:"pre",table:"table",tbody:"tbody",td:"td",th:"th",thead:"thead",tr:"tr",ul:"ul",...(0,i.a)(),...e.components};return(0,s.jsxs)(s.Fragment,{children:[(0,s.jsx)(n.p,{children:(0,s.jsx)(n.a,{href:"pathname:///files/c/bonuses/10.tar.gz",children:"Source"})}),"\n",(0,s.jsx)(n.h2,{id:"introduction",children:"Introduction"}),"\n",(0,s.jsx)(n.p,{children:"For this bonus you are given almost finished project - The Hangman Game. Your\ntask is to try the game, in case you find any bugs point them out and cover as\nmuch of the game as possible with tests."}),"\n",(0,s.jsx)(n.p,{children:"For this bonus you can get at maximum 2 K\u20a1."}),"\n",(0,s.jsxs)(n.table,{children:[(0,s.jsx)(n.thead,{children:(0,s.jsxs)(n.tr,{children:[(0,s.jsx)(n.th,{children:"Item"}),(0,s.jsx)(n.th,{children:"Bonus"})]})}),(0,s.jsxs)(n.tbody,{children:[(0,s.jsxs)(n.tr,{children:[(0,s.jsx)(n.td,{children:"Fixing bugs from failing tests"}),(0,s.jsx)(n.td,{children:"0.25"})]}),(0,s.jsxs)(n.tr,{children:[(0,s.jsx)(n.td,{children:(0,s.jsx)(n.code,{children:"word_guessed"})}),(0,s.jsx)(n.td,{children:"0.50"})]}),(0,s.jsxs)(n.tr,{children:[(0,s.jsx)(n.td,{children:"Hidden bug"}),(0,s.jsx)(n.td,{children:"0.50"})]}),(0,s.jsxs)(n.tr,{children:[(0,s.jsx)(n.td,{children:"Extending tests, undetectable bugs or evil bug"}),(0,s.jsx)(n.td,{children:"0.37"})]}),(0,s.jsxs)(n.tr,{children:[(0,s.jsx)(n.td,{children:"Refactor"}),(0,s.jsx)(n.td,{children:"0.38"})]})]})]}),"\n",(0,s.jsx)(n.h2,{id:"project",children:"Project"}),"\n",(0,s.jsxs)(n.p,{children:["Project consists of 2 source files - ",(0,s.jsx)(n.code,{children:"hangman.c"})," and ",(0,s.jsx)(n.code,{children:"main.c"}),"."]}),"\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.code,{children:"main.c"})," is quite short and concise, there is nothing for you to do."]}),"\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.code,{children:"hangman.c"})," contains implementation of the game. In case you feel lost, consult\nthe documentation in ",(0,s.jsx)(n.code,{children:"hangman.h"})," that represents an interface that can be used\nfor implementing the game."]}),"\n",(0,s.jsxs)(n.p,{children:["Apart from those sources this project is a bit more complicated. ",(0,s.jsx)(n.em,{children:"Game loop"})," is\nrealised via single encapsulated function that complicates the testing. Because\nof that, there are 2 kinds of tests:"]}),"\n",(0,s.jsxs)(n.ul,{children:["\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.em,{children:"Unit tests"})," - that are present in ",(0,s.jsx)(n.code,{children:"test_hangman.c"})," and can be run via:"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{children:"$ make check-unit\n"})}),"\n",(0,s.jsx)(n.p,{children:"They cover majorly functions that can be tested easily via testing framework."}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.em,{children:"Functional tests"})," - same as in ",(0,s.jsx)(n.code,{children:"seminar-08"})," and are focused on testing the\nprogram as whole. Basic smoke test is already included in ",(0,s.jsx)(n.code,{children:"usage"})," test case."]}),"\n",(0,s.jsx)(n.p,{children:"They can be run via:"}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{children:"$ make check-functional\n"})}),"\n",(0,s.jsxs)(n.p,{children:["When testing ",(0,s.jsx)(n.code,{children:"hangman"})," function (the game loop), it is suggested to create\nfunctional tests."]}),"\n",(0,s.jsx)(n.p,{children:"When submitting the files for review, please leave out functional tests that\nwere given as a part of the assignment, so that it is easier to navigate, I\nwill drag the common files myself. :)"}),"\n"]}),"\n"]}),"\n",(0,s.jsxs)(n.blockquote,{children:["\n",(0,s.jsx)(n.p,{children:"Whole test suite can be run via:"}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{children:"$ make check\n"})}),"\n"]}),"\n",(0,s.jsx)(n.h3,{id:"summary-of-the-gameplay",children:"Summary of the gameplay"}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsx)(n.li,{children:"Secret word gets chosen from the file that's path is given as an argument."}),"\n",(0,s.jsx)(n.li,{children:"You get 8 guesses."}),"\n",(0,s.jsx)(n.li,{children:"Invalid characters don't count."}),"\n",(0,s.jsx)(n.li,{children:"Already guessed characters don't count, even if not included in the secret."}),"\n",(0,s.jsxs)(n.li,{children:["You can guess the whole word at once","\n",(0,s.jsxs)(n.ul,{children:["\n",(0,s.jsx)(n.li,{children:"If you get it right, you won, game ends."}),"\n",(0,s.jsx)(n.li,{children:"If you don't get it right, you get to see the secret, game ends."}),"\n"]}),"\n"]}),"\n",(0,s.jsx)(n.li,{children:"In case of end of input, game finishes via force."}),"\n",(0,s.jsx)(n.li,{children:"In case of invalid input, no guesses are subtracted, game carries on."}),"\n",(0,s.jsx)(n.li,{children:"Letters and words are not case sensitive."}),"\n"]}),"\n",(0,s.jsx)(n.h2,{id:"suggested-workflow",children:"Suggested workflow"}),"\n",(0,s.jsxs)(n.p,{children:["As we have talked about on the seminar, I suggest you to follow\n",(0,s.jsx)(n.em,{children:"Test-Driven Development"}),"\nin this case."]}),"\n",(0,s.jsx)(n.p,{children:(0,s.jsx)(n.img,{alt:"TDD workflow",src:t(27420).Z+"",width:"2814",height:"1652"})}),"\n",(0,s.jsx)(n.p,{children:"In our current scenario we are already in the stage of refactoring and fixing the\nbugs. Therefore try to follow this succession of steps:"}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsx)(n.li,{children:"Try to reproduce the bug."}),"\n",(0,s.jsx)(n.li,{children:"Create a test that proves the presence of the bug."}),"\n",(0,s.jsx)(n.li,{children:"Fix the bug."}),"\n"]}),"\n",(0,s.jsxs)(n.p,{children:["In case you are submitting the bonus via GitLab, it is helpful to commit tests\nbefore commiting the fixes, so that it is apparent that the bug is manifested.\nExample of ",(0,s.jsx)(n.code,{children:"git log"})," (notice that the first line represents latest commit):"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{children:"feat: Implement fizz_buzzer\ntest: Add tests for fizz_buzzer\nfix: Fix NULL-check in print_name\ntest: Add test for NULL in print_name\n"})}),"\n",(0,s.jsx)(n.h2,{id:"tasks",children:"Tasks"}),"\n",(0,s.jsx)(n.p,{children:"As to your tasks, there are multiple things wrong in this project."}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsx)(n.p,{children:'There are 2 "bugs" that cannot be detected via tests, i.e. they are not bugs\nthat affect functionality of the game.'}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["There is one evil bug in ",(0,s.jsx)(n.code,{children:"get_word"}),". It is not required to be fixed ;) Assign\nit the lowest priority."]}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsx)(n.p,{children:"There are some tests failing. Please try to figure it out, so you have green\ntests for the rest :)"}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["We have gotten a bug report for ",(0,s.jsx)(n.code,{children:"word_guessed"}),", all we got is"]}),"\n",(0,s.jsxs)(n.blockquote,{children:["\n",(0,s.jsxs)(n.p,{children:["doesn't work when there are too many ",(0,s.jsx)(n.code,{children:"a"}),"s"]}),"\n"]}),"\n",(0,s.jsx)(n.p,{children:"Please try to replicate the bug and create a tests, so we don't get any\nregression later on."}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsx)(n.p,{children:"One hidden bug :) Closely non-specified, we cannot reproduce it and we were\ndrunk while playing the game, so we don't remember a thing. :/"}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsx)(n.p,{children:"Try to cover as much code via the tests as possible. We are not going to look\nat the metrics, but DRY is violated a lot, so as a last task try to remove as\nmuch of the duplicit code as possible."}),"\n",(0,s.jsx)(n.p,{children:"Tests should help you a lot in case there are some regressions."}),"\n"]}),"\n"]}),"\n",(0,s.jsx)(n.hr,{}),"\n",(0,s.jsxs)(n.p,{children:["In case you wonder why there are always 3 same words in the file with words, it\nis because of the ",(0,s.jsx)(n.code,{children:"get_word"})," bug. It is not a bug that can be easily fixed, so\nit is a not requirement at all and you can still get all points for the bonus ;)"]}),"\n",(0,s.jsx)(n.h2,{id:"dictionary",children:"Dictionary"}),"\n",(0,s.jsxs)(n.ul,{children:["\n",(0,s.jsx)(n.li,{children:(0,s.jsx)(n.a,{href:"https://en.wikipedia.org/wiki/Functional_testing",children:"Functional tests"})}),"\n",(0,s.jsx)(n.li,{children:(0,s.jsx)(n.a,{href:"https://en.wikipedia.org/wiki/Smoke_testing_%28software%29",children:"Smoke test"})}),"\n",(0,s.jsx)(n.li,{children:(0,s.jsx)(n.a,{href:"https://en.wikipedia.org/wiki/Don%27t_repeat_yourself",children:"DRY"})}),"\n"]}),"\n",(0,s.jsx)(n.h2,{id:"submitting",children:"Submitting"}),"\n",(0,s.jsx)(n.p,{children:"In case you have any questions, feel free to reach out to me."}),"\n",(0,s.jsx)(n.hr,{})]})}function h(e={}){const{wrapper:n}={...(0,i.a)(),...e.components};return n?(0,s.jsx)(n,{...e,children:(0,s.jsx)(d,{...e})}):d(e)}},27420:(e,n,t)=>{t.d(n,{Z:()=>s});const 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n=e.hierarchicalFacets[r],o=e.hierarchicalFacetsRefinements[n.name]&&e.hierarchicalFacetsRefinements[n.name][0]||"",h=e._getHierarchicalFacetSeparator(n),f=e._getHierarchicalRootPath(n),l=e._getHierarchicalShowParentLevel(n),m=s(e._getHierarchicalFacetSortBy(n)),d=t.every((function(e){return e.exhaustive})),p=function(e,t,r,n,s){return function(o,h,f){var l=o;if(f>0){var m=0;for(l=o;m<f;){var d=l&&Array.isArray(l.data)?l.data:[];l=i(d,(function(e){return e.isRefined})),m++}}if(l){var p=Object.keys(h.data).map((function(e){return[e,h.data[e]]})).filter((function(e){return function(e,t,r,n,i,s){if(i&&(0!==e.indexOf(i)||i===e))return!1;return!i&&-1===e.indexOf(n)||i&&e.split(n).length-i.split(n).length==1||-1===e.indexOf(n)&&-1===r.indexOf(n)||0===r.indexOf(e)||0===e.indexOf(t+n)&&(s||0===e.indexOf(r))}(e[0],l.path||r,s,t,r,n)}));l.data=a(p.map((function(e){var r=e[0];return function(e,t,r,n,i){var 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l,m=-1!==e.disjunctiveFacets.indexOf(t),d=-1!==e.facets.indexOf(t);m&&(l=g[t],u.disjunctiveFacets[l]={name:t,data:i,exhaustive:s.exhaustiveFacetsCount},p(u.disjunctiveFacets[l],s.facets_stats,t)),d&&(l=v[t],u.facets[l]={name:t,data:i,exhaustive:s.exhaustiveFacetsCount},p(u.facets[l],s.facets_stats,t))}})),this.hierarchicalFacets=n(this.hierarchicalFacets),f.forEach((function(r){var n=t[y],a=n&&n.facets?n.facets:{},h=e.getHierarchicalFacetByName(r);Object.keys(a).forEach((function(t){var r,f=a[t];if(h){r=c(e.hierarchicalFacets,(function(e){return e.name===h.name}));var m=c(u.hierarchicalFacets[r],(function(e){return e.attribute===t}));if(-1===m)return;u.hierarchicalFacets[r][m].data=o({},u.hierarchicalFacets[r][m].data,f)}else{r=g[t];var d=s.facets&&s.facets[t]||{};u.disjunctiveFacets[r]={name:t,data:i({},f,d),exhaustive:n.exhaustiveFacetsCount},p(u.disjunctiveFacets[r],n.facets_stats,t),e.disjunctiveFacetsRefinements[t]&&e.disjunctiveFacetsRefinements[t].forEach((function(n){!u.disjunctiveFacets[r].data[n]&&e.disjunctiveFacetsRefinements[t].indexOf(l(n))>-1&&(u.disjunctiveFacets[r].data[n]=0)}))}})),y++})),e.getRefinedHierarchicalFacets().forEach((function(r){var n=e.getHierarchicalFacetByName(r),s=e._getHierarchicalFacetSeparator(n),a=e.getHierarchicalRefinement(r);0===a.length||a[0].split(s).length<2||t.slice(y).forEach((function(t){var r=t&&t.facets?t.facets:{};Object.keys(r).forEach((function(t){var o=r[t],h=c(e.hierarchicalFacets,(function(e){return e.name===n.name})),f=c(u.hierarchicalFacets[h],(function(e){return e.attribute===t}));if(-1!==f){var l={};if(a.length>0&&!u.persistHierarchicalRootCount){var m=a[0].split(s)[0];l[m]=u.hierarchicalFacets[h][f].data[m]}u.hierarchicalFacets[h][f].data=i(l,o,u.hierarchicalFacets[h][f].data)}})),y++}))})),Object.keys(e.facetsExcludes).forEach((function(t){var r=e.facetsExcludes[t],n=v[t];u.facets[n]={name:t,data:R[t],exhaustive:s.exhaustiveFacetsCount},r.forEach((function(e){u.facets[n]=u.facets[n]||{name:t},u.facets[n].data=u.facets[n].data||{},u.facets[n].data[e]=0}))})),this.hierarchicalFacets=this.hierarchicalFacets.map(m(e)),this.facets=n(this.facets),this.disjunctiveFacets=n(this.disjunctiveFacets),this._state=e}function g(e,t){function r(e){return e.name===t}if(e._state.isConjunctiveFacet(t)){var n=a(e.facets,r);return n?Object.keys(n.data).map((function(r){var i=f(r);return{name:r,escapedValue:i,count:n.data[r],isRefined:e._state.isFacetRefined(t,i),isExcluded:e._state.isExcludeRefined(t,r)}})):[]}if(e._state.isDisjunctiveFacet(t)){var i=a(e.disjunctiveFacets,r);return i?Object.keys(i.data).map((function(r){var n=f(r);return{name:r,escapedValue:n,count:i.data[r],isRefined:e._state.isDisjunctiveFacetRefined(t,n)}})):[]}if(e._state.isHierarchicalFacet(t)){var s=a(e.hierarchicalFacets,r);if(!s)return s;var c=e._state.getHierarchicalFacetByName(t),u=e._state._getHierarchicalFacetSeparator(c),o=l(e._state.getHierarchicalRefinement(t)[0]||"");0===o.indexOf(c.rootPath)&&(o=o.replace(c.rootPath+u,""));var h=o.split(u);return h.unshift(t),y(s,h,0),s}}function y(e,t,r){e.isRefined=e.name===t[r],e.data&&e.data.forEach((function(e){y(e,t,r+1)}))}function R(e,t,r,n){if(n=n||0,Array.isArray(t))return e(t,r[n]);if(!t.data||0===t.data.length)return t;var s=t.data.map((function(t){return R(e,t,r,n+1)})),a=e(s,r[n]);return i({data:a},t)}function F(e,t){var r=a(e,(function(e){return e.name===t}));return r&&r.stats}function b(e,t,r,n,i){var s=a(i,(function(e){return 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Object.keys(e.facetsRefinements).forEach((function(n){e.facetsRefinements[n].forEach((function(i){r.push(b(e,"facet",n,i,t.facets))}))})),Object.keys(e.facetsExcludes).forEach((function(n){e.facetsExcludes[n].forEach((function(i){r.push(b(e,"exclude",n,i,t.facets))}))})),Object.keys(e.disjunctiveFacetsRefinements).forEach((function(n){e.disjunctiveFacetsRefinements[n].forEach((function(i){r.push(b(e,"disjunctive",n,i,t.disjunctiveFacets))}))})),Object.keys(e.hierarchicalFacetsRefinements).forEach((function(n){e.hierarchicalFacetsRefinements[n].forEach((function(i){r.push(function(e,t,r,n){var i=e.getHierarchicalFacetByName(t),s=e._getHierarchicalFacetSeparator(i),c=r.split(s),u=a(n,(function(e){return e.name===t})),o=c.reduce((function(e,t){var r=e&&a(e.data,(function(e){return e.name===t}));return void 0!==r?r:e}),u),h=o&&o.count||0,f=o&&o.exhaustive||!1,l=o&&o.path||"";return{type:"hierarchical",attributeName:t,name:l,count:h,exhaustive:f}}(e,n,i,t.hierarchicalFacets))}))})),Object.keys(e.numericRefinements).forEach((function(t){var n=e.numericRefinements[t];Object.keys(n).forEach((function(e){n[e].forEach((function(n){r.push({type:"numeric",attributeName:t,name:n,numericValue:n,operator:e})}))}))})),e.tagRefinements.forEach((function(e){r.push({type:"tag",attributeName:"_tags",name:e})})),r},e.exports=v},49374:(e,t,r)=>{"use strict";var n=r(17331),i=r(68078),s=r(94039).escapeFacetValue,a=r(14853),c=r(60185),u=r(90116),o=r(49803),h=r(96394),f=r(17775),l=r(23076),m=r(24336);function d(e,t,r,n){"function"==typeof e.addAlgoliaAgent&&e.addAlgoliaAgent("JS Helper ("+m+")"),this.setClient(e);var i=r||{};i.index=t,this.state=f.make(i),this.lastResults=null,this._queryId=0,this._lastQueryIdReceived=-1,this.derivedHelpers=[],this._currentNbQueries=0,this._searchResultsOptions=n}function p(e){if(e<0)throw new Error("Page requested below 0.");return this._change({state:this.state.setPage(e),isPageReset:!1}),this}function v(){return this.state.page}a(d,n),d.prototype.search=function(){return this._search({onlyWithDerivedHelpers:!1}),this},d.prototype.searchOnlyWithDerivedHelpers=function(){return this._search({onlyWithDerivedHelpers:!0}),this},d.prototype.getQuery=function(){var e=this.state;return h._getHitsSearchParams(e)},d.prototype.searchOnce=function(e,t){var r=e?this.state.setQueryParameters(e):this.state,n=h._getQueries(r.index,r),i=this;if(this._currentNbQueries++,this.emit("searchOnce",{state:r}),!t)return this.client.search(n).then((function(e){return i._currentNbQueries--,0===i._currentNbQueries&&i.emit("searchQueueEmpty"),{content:new l(r,e.results),state:r,_originalResponse:e}}),(function(e){throw i._currentNbQueries--,0===i._currentNbQueries&&i.emit("searchQueueEmpty"),e}));this.client.search(n).then((function(e){i._currentNbQueries--,0===i._currentNbQueries&&i.emit("searchQueueEmpty"),t(null,new l(r,e.results),r)})).catch((function(e){i._currentNbQueries--,0===i._currentNbQueries&&i.emit("searchQueueEmpty"),t(e,null,r)}))},d.prototype.findAnswers=function(e){console.warn("[algoliasearch-helper] answers is no longer supported");var t=this.state,r=this.derivedHelpers[0];if(!r)return Promise.resolve([]);var n=r.getModifiedState(t),i=c({attributesForPrediction:e.attributesForPrediction,nbHits:e.nbHits},{params:o(h._getHitsSearchParams(n),["attributesToSnippet","hitsPerPage","restrictSearchableAttributes","snippetEllipsisText"])}),s="search for answers was called, but this client does not have a function client.initIndex(index).findAnswers";if("function"!=typeof this.client.initIndex)throw new Error(s);var a=this.client.initIndex(n.index);if("function"!=typeof a.findAnswers)throw new Error(s);return a.findAnswers(n.query,e.queryLanguages,i)},d.prototype.searchForFacetValues=function(e,t,r,n){var i="function"==typeof this.client.searchForFacetValues,a="function"==typeof this.client.initIndex;if(!i&&!a&&"function"!=typeof this.client.search)throw new Error("search for facet values (searchable) was called, but this client does not have a function client.searchForFacetValues or client.initIndex(index).searchForFacetValues");var c=this.state.setQueryParameters(n||{}),u=c.isDisjunctiveFacet(e),o=h.getSearchForFacetQuery(e,t,r,c);this._currentNbQueries++;var f,l=this;return i?f=this.client.searchForFacetValues([{indexName:c.index,params:o}]):a?f=this.client.initIndex(c.index).searchForFacetValues(o):(delete o.facetName,f=this.client.search([{type:"facet",facet:e,indexName:c.index,params:o}]).then((function(e){return e.results[0]}))),this.emit("searchForFacetValues",{state:c,facet:e,query:t}),f.then((function(t){return l._currentNbQueries--,0===l._currentNbQueries&&l.emit("searchQueueEmpty"),(t=Array.isArray(t)?t[0]:t).facetHits.forEach((function(t){t.escapedValue=s(t.value),t.isRefined=u?c.isDisjunctiveFacetRefined(e,t.escapedValue):c.isFacetRefined(e,t.escapedValue)})),t}),(function(e){throw l._currentNbQueries--,0===l._currentNbQueries&&l.emit("searchQueueEmpty"),e}))},d.prototype.setQuery=function(e){return this._change({state:this.state.resetPage().setQuery(e),isPageReset:!0}),this},d.prototype.clearRefinements=function(e){return this._change({state:this.state.resetPage().clearRefinements(e),isPageReset:!0}),this},d.prototype.clearTags=function(){return this._change({state:this.state.resetPage().clearTags(),isPageReset:!0}),this},d.prototype.addDisjunctiveFacetRefinement=function(e,t){return this._change({state:this.state.resetPage().addDisjunctiveFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.addDisjunctiveRefine=function(){return this.addDisjunctiveFacetRefinement.apply(this,arguments)},d.prototype.addHierarchicalFacetRefinement=function(e,t){return this._change({state:this.state.resetPage().addHierarchicalFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.addNumericRefinement=function(e,t,r){return this._change({state:this.state.resetPage().addNumericRefinement(e,t,r),isPageReset:!0}),this},d.prototype.addFacetRefinement=function(e,t){return this._change({state:this.state.resetPage().addFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.addRefine=function(){return this.addFacetRefinement.apply(this,arguments)},d.prototype.addFacetExclusion=function(e,t){return this._change({state:this.state.resetPage().addExcludeRefinement(e,t),isPageReset:!0}),this},d.prototype.addExclude=function(){return this.addFacetExclusion.apply(this,arguments)},d.prototype.addTag=function(e){return this._change({state:this.state.resetPage().addTagRefinement(e),isPageReset:!0}),this},d.prototype.removeNumericRefinement=function(e,t,r){return this._change({state:this.state.resetPage().removeNumericRefinement(e,t,r),isPageReset:!0}),this},d.prototype.removeDisjunctiveFacetRefinement=function(e,t){return this._change({state:this.state.resetPage().removeDisjunctiveFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.removeDisjunctiveRefine=function(){return this.removeDisjunctiveFacetRefinement.apply(this,arguments)},d.prototype.removeHierarchicalFacetRefinement=function(e){return this._change({state:this.state.resetPage().removeHierarchicalFacetRefinement(e),isPageReset:!0}),this},d.prototype.removeFacetRefinement=function(e,t){return this._change({state:this.state.resetPage().removeFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.removeRefine=function(){return this.removeFacetRefinement.apply(this,arguments)},d.prototype.removeFacetExclusion=function(e,t){return this._change({state:this.state.resetPage().removeExcludeRefinement(e,t),isPageReset:!0}),this},d.prototype.removeExclude=function(){return this.removeFacetExclusion.apply(this,arguments)},d.prototype.removeTag=function(e){return this._change({state:this.state.resetPage().removeTagRefinement(e),isPageReset:!0}),this},d.prototype.toggleFacetExclusion=function(e,t){return this._change({state:this.state.resetPage().toggleExcludeFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.toggleExclude=function(){return this.toggleFacetExclusion.apply(this,arguments)},d.prototype.toggleRefinement=function(e,t){return this.toggleFacetRefinement(e,t)},d.prototype.toggleFacetRefinement=function(e,t){return this._change({state:this.state.resetPage().toggleFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.toggleRefine=function(){return this.toggleFacetRefinement.apply(this,arguments)},d.prototype.toggleTag=function(e){return this._change({state:this.state.resetPage().toggleTagRefinement(e),isPageReset:!0}),this},d.prototype.nextPage=function(){var e=this.state.page||0;return this.setPage(e+1)},d.prototype.previousPage=function(){var e=this.state.page||0;return this.setPage(e-1)},d.prototype.setCurrentPage=p,d.prototype.setPage=p,d.prototype.setIndex=function(e){return this._change({state:this.state.resetPage().setIndex(e),isPageReset:!0}),this},d.prototype.setQueryParameter=function(e,t){return this._change({state:this.state.resetPage().setQueryParameter(e,t),isPageReset:!0}),this},d.prototype.setState=function(e){return this._change({state:f.make(e),isPageReset:!1}),this},d.prototype.overrideStateWithoutTriggeringChangeEvent=function(e){return this.state=new 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i[e]=a({},i[e]),i[e][t]?(i[e][t]=i[e][t].slice(),i[e][t].push(n)):i[e][t]=[n],this.setQueryParameters({numericRefinements:i})},getConjunctiveRefinements:function(e){return this.isConjunctiveFacet(e)&&this.facetsRefinements[e]||[]},getDisjunctiveRefinements:function(e){return this.isDisjunctiveFacet(e)&&this.disjunctiveFacetsRefinements[e]||[]},getHierarchicalRefinement:function(e){return this.hierarchicalFacetsRefinements[e]||[]},getExcludeRefinements:function(e){return this.isConjunctiveFacet(e)&&this.facetsExcludes[e]||[]},removeNumericRefinement:function(e,t,r){var n=r;return void 0!==n?this.isNumericRefined(e,t,n)?this.setQueryParameters({numericRefinements:this._clearNumericRefinements((function(r,i){return i===e&&r.op===t&&l(r.val,o(n))}))}):this:void 0!==t?this.isNumericRefined(e,t)?this.setQueryParameters({numericRefinements:this._clearNumericRefinements((function(r,n){return n===e&&r.op===t}))}):this:this.isNumericRefined(e)?this.setQueryParameters({numericRefinements:this._clearNumericRefinements((function(t,r){return r===e}))}):this},getNumericRefinements:function(e){return this.numericRefinements[e]||{}},getNumericRefinement:function(e,t){return this.numericRefinements[e]&&this.numericRefinements[e][t]},_clearNumericRefinements:function(e){if(void 0===e)return c(this.numericRefinements)?{}:this.numericRefinements;if("string"==typeof e)return u(this.numericRefinements,[e]);if("function"==typeof e){var t=!1,r=this.numericRefinements,n=Object.keys(r).reduce((function(n,i){var s=r[i],a={};return s=s||{},Object.keys(s).forEach((function(r){var n=s[r]||[],c=[];n.forEach((function(t){e({val:t,op:r},i,"numeric")||c.push(t)})),c.length!==n.length&&(t=!0),a[r]=c})),n[i]=a,n}),{});return t?n:this.numericRefinements}},addFacet:function(e){return this.isConjunctiveFacet(e)?this:this.setQueryParameters({facets:this.facets.concat([e])})},addDisjunctiveFacet:function(e){return this.isDisjunctiveFacet(e)?this:this.setQueryParameters({disjunctiveFacets:this.disjunctiveFacets.concat([e])})},addHierarchicalFacet:function(e){if(this.isHierarchicalFacet(e.name))throw new Error("Cannot declare two hierarchical facets with the same name: `"+e.name+"`");return this.setQueryParameters({hierarchicalFacets:this.hierarchicalFacets.concat([e])})},addFacetRefinement:function(e,t){if(!this.isConjunctiveFacet(e))throw new Error(e+" is not defined in the facets attribute of the helper configuration");return f.isRefined(this.facetsRefinements,e,t)?this:this.setQueryParameters({facetsRefinements:f.addRefinement(this.facetsRefinements,e,t)})},addExcludeRefinement:function(e,t){if(!this.isConjunctiveFacet(e))throw new Error(e+" is not defined in the facets attribute of the helper configuration");return f.isRefined(this.facetsExcludes,e,t)?this:this.setQueryParameters({facetsExcludes:f.addRefinement(this.facetsExcludes,e,t)})},addDisjunctiveFacetRefinement:function(e,t){if(!this.isDisjunctiveFacet(e))throw new Error(e+" is not defined in the disjunctiveFacets attribute of the helper configuration");return f.isRefined(this.disjunctiveFacetsRefinements,e,t)?this:this.setQueryParameters({disjunctiveFacetsRefinements:f.addRefinement(this.disjunctiveFacetsRefinements,e,t)})},addTagRefinement:function(e){if(this.isTagRefined(e))return this;var t={tagRefinements:this.tagRefinements.concat(e)};return this.setQueryParameters(t)},removeFacet:function(e){return this.isConjunctiveFacet(e)?this.clearRefinements(e).setQueryParameters({facets:this.facets.filter((function(t){return t!==e}))}):this},removeDisjunctiveFacet:function(e){return this.isDisjunctiveFacet(e)?this.clearRefinements(e).setQueryParameters({disjunctiveFacets:this.disjunctiveFacets.filter((function(t){return t!==e}))}):this},removeHierarchicalFacet:function(e){return this.isHierarchicalFacet(e)?this.clearRefinements(e).setQueryParameters({hierarchicalFacets:this.hierarchicalFacets.filter((function(t){return t.name!==e}))}):this},removeFacetRefinement:function(e,t){if(!this.isConjunctiveFacet(e))throw new Error(e+" is not defined in the facets attribute of the helper configuration");return f.isRefined(this.facetsRefinements,e,t)?this.setQueryParameters({facetsRefinements:f.removeRefinement(this.facetsRefinements,e,t)}):this},removeExcludeRefinement:function(e,t){if(!this.isConjunctiveFacet(e))throw new Error(e+" is not defined in the facets attribute of the helper configuration");return f.isRefined(this.facetsExcludes,e,t)?this.setQueryParameters({facetsExcludes:f.removeRefinement(this.facetsExcludes,e,t)}):this},removeDisjunctiveFacetRefinement:function(e,t){if(!this.isDisjunctiveFacet(e))throw new Error(e+" is not defined in the disjunctiveFacets attribute of the helper configuration");return f.isRefined(this.disjunctiveFacetsRefinements,e,t)?this.setQueryParameters({disjunctiveFacetsRefinements:f.removeRefinement(this.disjunctiveFacetsRefinements,e,t)}):this},removeTagRefinement:function(e){if(!this.isTagRefined(e))return this;var t={tagRefinements:this.tagRefinements.filter((function(t){return t!==e}))};return this.setQueryParameters(t)},toggleRefinement:function(e,t){return this.toggleFacetRefinement(e,t)},toggleFacetRefinement:function(e,t){if(this.isHierarchicalFacet(e))return this.toggleHierarchicalFacetRefinement(e,t);if(this.isConjunctiveFacet(e))return this.toggleConjunctiveFacetRefinement(e,t);if(this.isDisjunctiveFacet(e))return this.toggleDisjunctiveFacetRefinement(e,t);throw new Error("Cannot refine the undeclared facet "+e+"; it should be added to the helper options facets, disjunctiveFacets or hierarchicalFacets")},toggleConjunctiveFacetRefinement:function(e,t){if(!this.isConjunctiveFacet(e))throw new Error(e+" is not defined in the facets attribute of the helper configuration");return this.setQueryParameters({facetsRefinements:f.toggleRefinement(this.facetsRefinements,e,t)})},toggleExcludeFacetRefinement:function(e,t){if(!this.isConjunctiveFacet(e))throw new Error(e+" is not defined in the facets attribute of the helper configuration");return this.setQueryParameters({facetsExcludes:f.toggleRefinement(this.facetsExcludes,e,t)})},toggleDisjunctiveFacetRefinement:function(e,t){if(!this.isDisjunctiveFacet(e))throw new Error(e+" is not defined in the disjunctiveFacets attribute of the helper configuration");return this.setQueryParameters({disjunctiveFacetsRefinements:f.toggleRefinement(this.disjunctiveFacetsRefinements,e,t)})},toggleHierarchicalFacetRefinement:function(e,t){if(!this.isHierarchicalFacet(e))throw new Error(e+" is not defined in the hierarchicalFacets attribute of the helper configuration");var r=this._getHierarchicalFacetSeparator(this.getHierarchicalFacetByName(e)),i={};return void 0!==this.hierarchicalFacetsRefinements[e]&&this.hierarchicalFacetsRefinements[e].length>0&&(this.hierarchicalFacetsRefinements[e][0]===t||0===this.hierarchicalFacetsRefinements[e][0].indexOf(t+r))?-1===t.indexOf(r)?i[e]=[]:i[e]=[t.slice(0,t.lastIndexOf(r))]:i[e]=[t],this.setQueryParameters({hierarchicalFacetsRefinements:n({},i,this.hierarchicalFacetsRefinements)})},addHierarchicalFacetRefinement:function(e,t){if(this.isHierarchicalFacetRefined(e))throw new Error(e+" is already refined.");if(!this.isHierarchicalFacet(e))throw new Error(e+" is not defined in the hierarchicalFacets attribute of the helper configuration.");var r={};return r[e]=[t],this.setQueryParameters({hierarchicalFacetsRefinements:n({},r,this.hierarchicalFacetsRefinements)})},removeHierarchicalFacetRefinement:function(e){if(!this.isHierarchicalFacetRefined(e))return this;var t={};return t[e]=[],this.setQueryParameters({hierarchicalFacetsRefinements:n({},t,this.hierarchicalFacetsRefinements)})},toggleTagRefinement:function(e){return this.isTagRefined(e)?this.removeTagRefinement(e):this.addTagRefinement(e)},isDisjunctiveFacet:function(e){return this.disjunctiveFacets.indexOf(e)>-1},isHierarchicalFacet:function(e){return void 0!==this.getHierarchicalFacetByName(e)},isConjunctiveFacet:function(e){return this.facets.indexOf(e)>-1},isFacetRefined:function(e,t){return!!this.isConjunctiveFacet(e)&&f.isRefined(this.facetsRefinements,e,t)},isExcludeRefined:function(e,t){return!!this.isConjunctiveFacet(e)&&f.isRefined(this.facetsExcludes,e,t)},isDisjunctiveFacetRefined:function(e,t){return!!this.isDisjunctiveFacet(e)&&f.isRefined(this.disjunctiveFacetsRefinements,e,t)},isHierarchicalFacetRefined:function(e,t){if(!this.isHierarchicalFacet(e))return!1;var r=this.getHierarchicalRefinement(e);return t?-1!==r.indexOf(t):r.length>0},isNumericRefined:function(e,t,r){if(void 0===r&&void 0===t)return Boolean(this.numericRefinements[e]);var n=this.numericRefinements[e]&&void 0!==this.numericRefinements[e][t];if(void 0===r||!n)return n;var s,a,c=o(r),u=void 0!==(s=this.numericRefinements[e][t],a=c,i(s,(function(e){return l(e,a)})));return n&&u},isTagRefined:function(e){return-1!==this.tagRefinements.indexOf(e)},getRefinedDisjunctiveFacets:function(){var e=this,t=s(Object.keys(this.numericRefinements).filter((function(t){return Object.keys(e.numericRefinements[t]).length>0})),this.disjunctiveFacets);return Object.keys(this.disjunctiveFacetsRefinements).filter((function(t){return e.disjunctiveFacetsRefinements[t].length>0})).concat(t).concat(this.getRefinedHierarchicalFacets()).sort()},getRefinedHierarchicalFacets:function(){var e=this;return s(this.hierarchicalFacets.map((function(e){return e.name})),Object.keys(this.hierarchicalFacetsRefinements).filter((function(t){return e.hierarchicalFacetsRefinements[t].length>0}))).sort()},getUnrefinedDisjunctiveFacets:function(){var e=this.getRefinedDisjunctiveFacets();return this.disjunctiveFacets.filter((function(t){return-1===e.indexOf(t)}))},managedParameters:["index","facets","disjunctiveFacets","facetsRefinements","hierarchicalFacets","facetsExcludes","disjunctiveFacetsRefinements","numericRefinements","tagRefinements","hierarchicalFacetsRefinements"],getQueryParams:function(){var e=this.managedParameters,t={},r=this;return Object.keys(this).forEach((function(n){var i=r[n];-1===e.indexOf(n)&&void 0!==i&&(t[n]=i)})),t},setQueryParameter:function(e,t){if(this[e]===t)return this;var r={};return r[e]=t,this.setQueryParameters(r)},setQueryParameters:function(e){if(!e)return this;var t=m.validate(this,e);if(t)throw t;var r=this,n=m._parseNumbers(e),i=Object.keys(this).reduce((function(e,t){return e[t]=r[t],e}),{}),s=Object.keys(n).reduce((function(e,t){var r=void 0!==e[t],i=void 0!==n[t];return r&&!i?u(e,[t]):(i&&(e[t]=n[t]),e)}),i);return new this.constructor(s)},resetPage:function(){return void 0===this.page?this:this.setPage(0)},_getHierarchicalFacetSortBy:function(e){return e.sortBy||["isRefined:desc","name:asc"]},_getHierarchicalFacetSeparator:function(e){return e.separator||" > "},_getHierarchicalRootPath:function(e){return e.rootPath||null},_getHierarchicalShowParentLevel:function(e){return"boolean"!=typeof e.showParentLevel||e.showParentLevel},getHierarchicalFacetByName:function(e){return i(this.hierarchicalFacets,(function(t){return t.name===e}))},getHierarchicalFacetBreadcrumb:function(e){if(!this.isHierarchicalFacet(e))return[];var t=this.getHierarchicalRefinement(e)[0];if(!t)return[];var r=this._getHierarchicalFacetSeparator(this.getHierarchicalFacetByName(e));return t.split(r).map((function(e){return e.trim()}))},toString:function(){return JSON.stringify(this,null,2)}},e.exports=m},10210:(e,t,r)=>{"use strict";e.exports=function(e){return function(t,r){var n=e.hierarchicalFacets[r],o=e.hierarchicalFacetsRefinements[n.name]&&e.hierarchicalFacetsRefinements[n.name][0]||"",h=e._getHierarchicalFacetSeparator(n),f=e._getHierarchicalRootPath(n),l=e._getHierarchicalShowParentLevel(n),m=s(e._getHierarchicalFacetSortBy(n)),d=t.every((function(e){return e.exhaustive})),p=function(e,t,r,n,s){return function(o,h,f){var l=o;if(f>0){var m=0;for(l=o;m<f;){var d=l&&Array.isArray(l.data)?l.data:[];l=i(d,(function(e){return e.isRefined})),m++}}if(l){var p=Object.keys(h.data).map((function(e){return[e,h.data[e]]})).filter((function(e){return function(e,t,r,n,i,s){if(i&&(0!==e.indexOf(i)||i===e))return!1;return!i&&-1===e.indexOf(n)||i&&e.split(n).length-i.split(n).length==1||-1===e.indexOf(n)&&-1===r.indexOf(n)||0===r.indexOf(e)||0===e.indexOf(t+n)&&(s||0===e.indexOf(r))}(e[0],l.path||r,s,t,r,n)}));l.data=a(p.map((function(e){var r=e[0];return function(e,t,r,n,i){var s=t.split(r);return{name:s[s.length-1].trim(),path:t,escapedValue:c(t),count:e,isRefined:n===t||0===n.indexOf(t+r),exhaustive:i,data:null}}(e[1],r,t,u(s),h.exhaustive)})),e[0],e[1])}return o}}(m,h,f,l,o),v=t;return f&&(v=t.slice(f.split(h).length)),v.reduce(p,{name:e.hierarchicalFacets[r].name,count:null,isRefined:!0,path:null,escapedValue:null,exhaustive:d,data:null})}};var n=r(94039),i=r(7888),s=r(82293),a=r(42148),c=n.escapeFacetValue,u=n.unescapeFacetValue},23076:(e,t,r)=>{"use strict";var n=r(74587),i=r(52344),s=r(94039),a=r(7888),c=r(69725),u=r(82293),o=r(60185),h=r(42148),f=s.escapeFacetValue,l=s.unescapeFacetValue,m=r(10210);function d(e){var t={};return e.forEach((function(e,r){t[e]=r})),t}function p(e,t,r){t&&t[r]&&(e.stats=t[r])}function v(e,t,r){var s=t[0];this._rawResults=t;var u=this;Object.keys(s).forEach((function(e){u[e]=s[e]}));var h=o({persistHierarchicalRootCount:!1},r);Object.keys(h).forEach((function(e){u[e]=h[e]})),this.processingTimeMS=t.reduce((function(e,t){return void 0===t.processingTimeMS?e:e+t.processingTimeMS}),0),this.disjunctiveFacets=[],this.hierarchicalFacets=e.hierarchicalFacets.map((function(){return[]})),this.facets=[];var f=e.getRefinedDisjunctiveFacets(),v=d(e.facets),g=d(e.disjunctiveFacets),y=1,R=s.facets||{};Object.keys(R).forEach((function(t){var r,n,i=R[t],o=(r=e.hierarchicalFacets,n=t,a(r,(function(e){return(e.attributes||[]).indexOf(n)>-1})));if(o){var h=o.attributes.indexOf(t),f=c(e.hierarchicalFacets,(function(e){return e.name===o.name}));u.hierarchicalFacets[f][h]={attribute:t,data:i,exhaustive:s.exhaustiveFacetsCount}}else{var l,m=-1!==e.disjunctiveFacets.indexOf(t),d=-1!==e.facets.indexOf(t);m&&(l=g[t],u.disjunctiveFacets[l]={name:t,data:i,exhaustive:s.exhaustiveFacetsCount},p(u.disjunctiveFacets[l],s.facets_stats,t)),d&&(l=v[t],u.facets[l]={name:t,data:i,exhaustive:s.exhaustiveFacetsCount},p(u.facets[l],s.facets_stats,t))}})),this.hierarchicalFacets=n(this.hierarchicalFacets),f.forEach((function(r){var n=t[y],a=n&&n.facets?n.facets:{},h=e.getHierarchicalFacetByName(r);Object.keys(a).forEach((function(t){var r,f=a[t];if(h){r=c(e.hierarchicalFacets,(function(e){return e.name===h.name}));var m=c(u.hierarchicalFacets[r],(function(e){return e.attribute===t}));if(-1===m)return;u.hierarchicalFacets[r][m].data=o({},u.hierarchicalFacets[r][m].data,f)}else{r=g[t];var d=s.facets&&s.facets[t]||{};u.disjunctiveFacets[r]={name:t,data:i({},f,d),exhaustive:n.exhaustiveFacetsCount},p(u.disjunctiveFacets[r],n.facets_stats,t),e.disjunctiveFacetsRefinements[t]&&e.disjunctiveFacetsRefinements[t].forEach((function(n){!u.disjunctiveFacets[r].data[n]&&e.disjunctiveFacetsRefinements[t].indexOf(l(n))>-1&&(u.disjunctiveFacets[r].data[n]=0)}))}})),y++})),e.getRefinedHierarchicalFacets().forEach((function(r){var n=e.getHierarchicalFacetByName(r),s=e._getHierarchicalFacetSeparator(n),a=e.getHierarchicalRefinement(r);0===a.length||a[0].split(s).length<2||t.slice(y).forEach((function(t){var r=t&&t.facets?t.facets:{};Object.keys(r).forEach((function(t){var o=r[t],h=c(e.hierarchicalFacets,(function(e){return e.name===n.name})),f=c(u.hierarchicalFacets[h],(function(e){return e.attribute===t}));if(-1!==f){var l={};if(a.length>0&&!u.persistHierarchicalRootCount){var m=a[0].split(s)[0];l[m]=u.hierarchicalFacets[h][f].data[m]}u.hierarchicalFacets[h][f].data=i(l,o,u.hierarchicalFacets[h][f].data)}})),y++}))})),Object.keys(e.facetsExcludes).forEach((function(t){var r=e.facetsExcludes[t],n=v[t];u.facets[n]={name:t,data:R[t],exhaustive:s.exhaustiveFacetsCount},r.forEach((function(e){u.facets[n]=u.facets[n]||{name:t},u.facets[n].data=u.facets[n].data||{},u.facets[n].data[e]=0}))})),this.hierarchicalFacets=this.hierarchicalFacets.map(m(e)),this.facets=n(this.facets),this.disjunctiveFacets=n(this.disjunctiveFacets),this._state=e}function g(e,t){function r(e){return e.name===t}if(e._state.isConjunctiveFacet(t)){var n=a(e.facets,r);return n?Object.keys(n.data).map((function(r){var i=f(r);return{name:r,escapedValue:i,count:n.data[r],isRefined:e._state.isFacetRefined(t,i),isExcluded:e._state.isExcludeRefined(t,r)}})):[]}if(e._state.isDisjunctiveFacet(t)){var i=a(e.disjunctiveFacets,r);return i?Object.keys(i.data).map((function(r){var n=f(r);return{name:r,escapedValue:n,count:i.data[r],isRefined:e._state.isDisjunctiveFacetRefined(t,n)}})):[]}if(e._state.isHierarchicalFacet(t)){var s=a(e.hierarchicalFacets,r);if(!s)return s;var c=e._state.getHierarchicalFacetByName(t),u=e._state._getHierarchicalFacetSeparator(c),o=l(e._state.getHierarchicalRefinement(t)[0]||"");0===o.indexOf(c.rootPath)&&(o=o.replace(c.rootPath+u,""));var h=o.split(u);return h.unshift(t),y(s,h,0),s}}function y(e,t,r){e.isRefined=e.name===t[r],e.data&&e.data.forEach((function(e){y(e,t,r+1)}))}function R(e,t,r,n){if(n=n||0,Array.isArray(t))return e(t,r[n]);if(!t.data||0===t.data.length)return t;var s=t.data.map((function(t){return R(e,t,r,n+1)})),a=e(s,r[n]);return i({data:a},t)}function F(e,t){var r=a(e,(function(e){return e.name===t}));return r&&r.stats}function b(e,t,r,n,i){var s=a(i,(function(e){return e.name===r})),c=s&&s.data&&s.data[n]?s.data[n]:0,u=s&&s.exhaustive||!1;return{type:t,attributeName:r,name:n,count:c,exhaustive:u}}v.prototype.getFacetByName=function(e){function t(t){return t.name===e}return a(this.facets,t)||a(this.disjunctiveFacets,t)||a(this.hierarchicalFacets,t)},v.DEFAULT_SORT=["isRefined:desc","count:desc","name:asc"],v.prototype.getFacetValues=function(e,t){var r=g(this,e);if(r){var n,s=i({},t,{sortBy:v.DEFAULT_SORT,facetOrdering:!(t&&t.sortBy)}),a=this;if(Array.isArray(r))n=[e];else n=a._state.getHierarchicalFacetByName(r.name).attributes;return R((function(e,t){if(s.facetOrdering){var r=function(e,t){return e.renderingContent&&e.renderingContent.facetOrdering&&e.renderingContent.facetOrdering.values&&e.renderingContent.facetOrdering.values[t]}(a,t);if(r)return function(e,t){var r=[],n=[],i=(t.order||[]).reduce((function(e,t,r){return e[t]=r,e}),{});e.forEach((function(e){var t=e.path||e.name;void 0!==i[t]?r[i[t]]=e:n.push(e)})),r=r.filter((function(e){return e}));var s,a=t.sortRemainingBy;return"hidden"===a?r:(s="alpha"===a?[["path","name"],["asc","asc"]]:[["count"],["desc"]],r.concat(h(n,s[0],s[1])))}(e,r)}if(Array.isArray(s.sortBy)){var n=u(s.sortBy,v.DEFAULT_SORT);return h(e,n[0],n[1])}if("function"==typeof s.sortBy)return function(e,t){return t.sort(e)}(s.sortBy,e);throw new Error("options.sortBy is optional but if defined it must be either an array of string (predicates) or a sorting function")}),r,n)}},v.prototype.getFacetStats=function(e){return this._state.isConjunctiveFacet(e)?F(this.facets,e):this._state.isDisjunctiveFacet(e)?F(this.disjunctiveFacets,e):void 0},v.prototype.getRefinements=function(){var e=this._state,t=this,r=[];return Object.keys(e.facetsRefinements).forEach((function(n){e.facetsRefinements[n].forEach((function(i){r.push(b(e,"facet",n,i,t.facets))}))})),Object.keys(e.facetsExcludes).forEach((function(n){e.facetsExcludes[n].forEach((function(i){r.push(b(e,"exclude",n,i,t.facets))}))})),Object.keys(e.disjunctiveFacetsRefinements).forEach((function(n){e.disjunctiveFacetsRefinements[n].forEach((function(i){r.push(b(e,"disjunctive",n,i,t.disjunctiveFacets))}))})),Object.keys(e.hierarchicalFacetsRefinements).forEach((function(n){e.hierarchicalFacetsRefinements[n].forEach((function(i){r.push(function(e,t,r,n){var i=e.getHierarchicalFacetByName(t),s=e._getHierarchicalFacetSeparator(i),c=r.split(s),u=a(n,(function(e){return e.name===t})),o=c.reduce((function(e,t){var r=e&&a(e.data,(function(e){return e.name===t}));return void 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p(e){if(e<0)throw new Error("Page requested below 0.");return this._change({state:this.state.setPage(e),isPageReset:!1}),this}function v(){return this.state.page}a(d,n),d.prototype.search=function(){return this._search({onlyWithDerivedHelpers:!1}),this},d.prototype.searchOnlyWithDerivedHelpers=function(){return this._search({onlyWithDerivedHelpers:!0}),this},d.prototype.getQuery=function(){var e=this.state;return h._getHitsSearchParams(e)},d.prototype.searchOnce=function(e,t){var r=e?this.state.setQueryParameters(e):this.state,n=h._getQueries(r.index,r),i=this;if(this._currentNbQueries++,this.emit("searchOnce",{state:r}),!t)return this.client.search(n).then((function(e){return i._currentNbQueries--,0===i._currentNbQueries&&i.emit("searchQueueEmpty"),{content:new l(r,e.results),state:r,_originalResponse:e}}),(function(e){throw 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l._currentNbQueries--,0===l._currentNbQueries&&l.emit("searchQueueEmpty"),(t=Array.isArray(t)?t[0]:t).facetHits.forEach((function(t){t.escapedValue=s(t.value),t.isRefined=u?c.isDisjunctiveFacetRefined(e,t.escapedValue):c.isFacetRefined(e,t.escapedValue)})),t}),(function(e){throw l._currentNbQueries--,0===l._currentNbQueries&&l.emit("searchQueueEmpty"),e}))},d.prototype.setQuery=function(e){return this._change({state:this.state.resetPage().setQuery(e),isPageReset:!0}),this},d.prototype.clearRefinements=function(e){return this._change({state:this.state.resetPage().clearRefinements(e),isPageReset:!0}),this},d.prototype.clearTags=function(){return this._change({state:this.state.resetPage().clearTags(),isPageReset:!0}),this},d.prototype.addDisjunctiveFacetRefinement=function(e,t){return this._change({state:this.state.resetPage().addDisjunctiveFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.addDisjunctiveRefine=function(){return 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this._change({state:this.state.resetPage().addTagRefinement(e),isPageReset:!0}),this},d.prototype.removeNumericRefinement=function(e,t,r){return this._change({state:this.state.resetPage().removeNumericRefinement(e,t,r),isPageReset:!0}),this},d.prototype.removeDisjunctiveFacetRefinement=function(e,t){return this._change({state:this.state.resetPage().removeDisjunctiveFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.removeDisjunctiveRefine=function(){return this.removeDisjunctiveFacetRefinement.apply(this,arguments)},d.prototype.removeHierarchicalFacetRefinement=function(e){return this._change({state:this.state.resetPage().removeHierarchicalFacetRefinement(e),isPageReset:!0}),this},d.prototype.removeFacetRefinement=function(e,t){return this._change({state:this.state.resetPage().removeFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.removeRefine=function(){return this.removeFacetRefinement.apply(this,arguments)},d.prototype.removeFacetExclusion=function(e,t){return this._change({state:this.state.resetPage().removeExcludeRefinement(e,t),isPageReset:!0}),this},d.prototype.removeExclude=function(){return this.removeFacetExclusion.apply(this,arguments)},d.prototype.removeTag=function(e){return this._change({state:this.state.resetPage().removeTagRefinement(e),isPageReset:!0}),this},d.prototype.toggleFacetExclusion=function(e,t){return this._change({state:this.state.resetPage().toggleExcludeFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.toggleExclude=function(){return this.toggleFacetExclusion.apply(this,arguments)},d.prototype.toggleRefinement=function(e,t){return this.toggleFacetRefinement(e,t)},d.prototype.toggleFacetRefinement=function(e,t){return this._change({state:this.state.resetPage().toggleFacetRefinement(e,t),isPageReset:!0}),this},d.prototype.toggleRefine=function(){return this.toggleFacetRefinement.apply(this,arguments)},d.prototype.toggleTag=function(e){return 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I\'ve managed to get my\\nhands dirty with it during _[Advent of Code]_ \u201822 and partially \u201823. I\'ve also\\nused it for few rounds of _[Codeforces]_ and I have to try very hard to maintain\\nsome variety of languages for LeetCode challenges along with the Rust. I\'ll\\ndisclaim up front that I won\'t be only positive, since this post is a result of\\nmultiple discussions about Rust and I stand behind\\n_\u201cAll that glitters is not gold\u201d_, so if you can\'t stand your favorite language\\nbeing criticized in any way, don\'t even proceed. :wink:\\n\\n\x3c!--truncate--\x3e\\n\\n## Memory safety\\n\\nI\'ll start by kicking the biggest benefit of the language, the memory safety.\\nLet\'s be honest here, majority of the checks rely on the static analysis, cause\\nyou can\'t do anything else during the compile-time, right? Therefore we can\\nbasically say that we are relying on the compiler to \u201csolve\u201d all of our issues.\\n\\n:::warning\\n\\nI\'m not doubting the fact that compiler can prevent **a lot** of the memory\\nerrors, I\'m just saying it\'s not realistic to cover **everything**.\\n\\n:::\\n\\n### Compiler\\n\\nI guess we can safely[^2] agree on the fact that we 100% rely on the compiler to\\n_have our back_. Is the compiler bug-free? I doubt it. This is not meant in an\\noffensive way to the Rust compiler developers, but we need to be realistic here.\\nIt\'s a compiler, even older and larger projects like _gcc_ or _llvm_ can\'t avoid\\nbugs to appear.\\n\\nWhen I was trying out Rust for some of the LeetCode challenges I\'ve stumbled\\nupon the following warning:\\n![Example of a compiler bug](https://i.imgur.com/NfPLF6o.png)\\n\\n:::danger [Issue](https://github.com/rust-lang/rust/issues/59159)\\n\\nThe issue here comes from the fact that we have 2 simultaneous references to the\\nsame memory (one is mutable and one immutable). If you cannot think of any way\\nthis can break, I\'ll give you a rather simple example from C++ where this could\\ncause an issue.\\n\\nImagine a function that has some complex object and also calls a coroutine which\\nutilizes read-only reference to that object. When the coroutine suspends, the\\ncaller can modify the object. This can break the integrity of data read by the\\ncoroutine.\\n\\n- Yes, this **can** cause a memory error.\\n- Yes, this **hasn\'t** been handled until someone noticed it.\\n\\nFixing this bug is not backwards compatible, cause you\'re covering a case that\\nhasn\'t been covered before.\\n\\n:::\\n\\n### Enforcing the safety\\n\\nOne of the ways Rust enforces the safety is by restricting what you can do, like\\nthe example above. Aforementioned issue _can_ happen, but **doesn\'t have to**.\\nRule of the thumb in the Rust compiler is to _\u201cblock\u201d_ anything that can be an\\nissue, static analysis can\'t do much more, it cannot decide whether it\'s safe to\\ndo it or not.\\n\\nSatisfying the Rust compiler is sometimes a brutal pain in the ass, because you\\ncannot do things like you\'re used to, you need to work around them _somehow_.\\n\\n:::tip\\n\\nKey difference between Rust and C or C++ lies in the fact that Rust chooses to\\n_ban_ all \u201cpotentially offensive\u201d actions, C and C++ _relies_ on **you** to be\\nsure it\'s safe to do.\\n\\n![C++ v. Rust](https://i.imgur.com/0vbkYPp.png)\\n\\n:::\\n\\n### Consequences\\n\\nWhere are we heading with this approach of \u201cif it compiles, it runs\u201d though?\\nIn this aspect I have a rather similar opinion as with regards to the ChatGPT\\nand its derivatives.\\n\\nIf you teach people to 100% depend on the compiler, they will do it, cause it\'s\\n_easy_. All you need to do is make the compiler _shut up_[^3]. Giving up the\\n_intellectual masturbation_ about the memory safety will make you lose your edge\\nover the time. When we get to the point of everyone being in the mindset\\nmentioned above, who\'s going to maintain the compiler? This is the place where\\nyou **need to** think about the memory safety and furthermore in a much more\\ngeneral way than in your own projects, because it is the thing that everyone\\n_blindly believes in_ in the end.\\n\\nI\'m not saying that everyone should give up Rust and think about their memory\\nmanagement and potential memory issues. I\'m just saying that going the easy way\\nwill make people _dull_ and they should think about it anyways, that\'s how the\\nissue above has been discovered. If everyone walked past and didn\'t think about\\nit, no one would discover this issue till it bit them hard.\\n\\n:::tip Standard library\\n\\nEven the standard library is littered with `unsafe` blocks that are prefixed\\nwith comments in style:\\n\\n```rs\\n// SAFETY: \u2026\\n```\\n\\nThe fact that the _casual_ Rust dev doesn\'t have to think much about safety,\\ncause the compiler has their back, doesn\'t mean that the Rust compiler dev\\ndoesn\'t either.\\n\\nI gotta admit that I adopted this concept in other languages (even in Python),\\ncause you can encounter situations where it doesn\'t have to be clear _why_ you\\ncan do _what_ you\'re doing.\\n\\n:::\\n\\n## Development & design\\n\\nDevelopment of Rust is\u2026 very fast. One positive is that they\'re trying to be as\\nbackward compatible as possible at least by verifying against all the published\\ncrates in the process. Of course, you cannot be backward compatible about fixing\\nthe bugs that have been found, but such is life.\\n\\n### Fast development cycle\\n\\nOne of the negatives of the fast development cycle is the fact that they\'re\\nusing the latest features already in the next release of the Rust. Yes, it is\\nsomething that you can use for verifying and testing your own changes, but at\\nthe same time it places a requirement of the latest release to compile the next\\none.\\n\\n:::tip\\n\\nIf you check `gcc` for example, they have a requirement of minimal version of\\ncompiler that you need for the build. Though gcc\'s requirement is not so _needy_\\nas the Rust one.\\n\\n:::\\n\\nOne of the other negatives is the introduction of bugs. If you\'re pushing\\nchanges, somewhat mindlessly, at such a fast pace, it is inevitable to introduce\\na bunch bugs in the process. Checking the GitHub issue tracker with\\n\\n```\\nis:issue is:open label:C-bug label:T-compiler\\n```\\n\\nyields **2,224** open issues at the time of writing this post.\\n\\n### RFCs\\n\\nYou can find **a lot** of RFCs for the Rust. Some of them are more questionable\\nthan the others. Fun thing is that a lot of them make it to the nightly builds,\\nso they can be tested and polished off. Even the questionable ones\u2026 I\'ll leave\\nfew examples for a better understanding.\\n\\nOne of such features is the `do yeet` expression:\\n\\n```rust\\n#![feature(yeet_expr)]\\n\\nfn foo() -> Result<String, i32> {\\n do yeet 4;\\n}\\nassert_eq!(foo(), Err(4));\\n\\nfn bar() -> Option<String> {\\n do yeet;\\n}\\nassert_eq!(bar(), None);\\n```\\n\\nIt allows you to \u201cyeet\u201d the errors out of the functions that return `Result` or\\n`Option`.\\n\\n[One](https://github.com/rust-lang/rfcs/pull/3503) of the more recent ones is\\nthe ability to include Cargo manifests into the sources, so you can do something\\nlike:\\n\\n```rust\\n#!/usr/bin/env cargo\\n---\\n[dependencies]\\nclap = { version = \\"4.2\\", features = [\\"derive\\"] }\\n---\\n\\nuse clap::Parser;\\n\\n#[derive(Parser, Debug)]\\n#[clap(version)]\\nstruct Args {\\n #[clap(short, long, help = \\"Path to config\\")]\\n config: Option<std::path::PathBuf>,\\n}\\n\\nfn main() {\\n let args = Args::parse();\\n println!(\\"{:?}\\", args);\\n}\\n```\\n\\nI would say you can get almost anything into the language\u2026\\n\\n## Community and hype train\\n\\nRust community is a rather unique thing. A lot of people will hate me for this,\\nbut I can\'t help, but to compare them to _militant vegans_. I\'ll go through some\\nof the things related to it, so I can support my opinion at least.\\n\\n_Rust is the best language._ It is not. There is no best language, each has its\\nown positives and negatives, you need to choose the language that\'s **the most**\\n**suitable for your use case**. There are areas where Rust excels, though I have\\nto admit it\'s very close to being a universal hammer regardless of how suitable\\nit is. There is a very steep learning curve to it, beginnings in Rust are very\\npainful.\\n\\n_Rewrite everything in Rust._ Just no. There are multiple feedbacks on doing\\nrewrites, it is very common to fix _N_ bugs with a rewrite while introducing\\n_N + 1_ other bugs in the process. It doesn\'t solve anything unless there are\\nsome strong reasons to go with it. Majority of such suggested rewrites don\'t\\nhave those reasons though.\\n\\n_Language \u2039x\u203a is bad, though in Rust\u2026_ Cherry-picking one specific pain point of\\none language and reflecting how it is better in other language can go both ways.\\nFor example it is rather easy to pick the limitations imposed by Rust compiler\\nand show how it\'s possible in other languages :man_shrugging:\\n\\nI don\'t mind any of those opinions, you\'re free to have them, as long as you\\ndon\'t rub them in my face which is not the usual case\u2026 This experience makes it\\njust worse for me, part of this post may be also influenced by this fact.\\n\\n### Rust in Linux\\n\\n:::caution\\n\\nAs someone who has seen the way Linux kernel is built in the RHEL ecosystem, how\\ncomplex the whole thing is and how much resources you need to proceed, I have\\nvery strong opinions on this topic.\\n\\n:::\\n\\nIt took years of work to even \u201cincorporate\u201d Rust into the Linux codebase, just\\nto get the \u201cHello World!\u201d. I don\'t have anything against the idea of writing\\ndrivers in the Rust, I bet it can catch a lot of common mistakes, but still\\nintroducing Rust to the kernel is another step to enlarge the monster.\\n\\nI have to admit though that the _Apple GPU_ driver for Linux written in Rust is\\nquite impressive. Apart from that there are not so many benefits, yet\u2026\\n\\n## Packaging\\n\\nI\'ll divide the packaging into the packaging of the language itself and the\\nprograms written in Rust.\\n\\nLet\'s start with the `cargo` itself though. Package managers of the languages\\nusually get a lot of hate (you can take `npm` or `pip` as examples[^1]). If\\nyou\'ve ever tried out Rust, I bet you already know where I\'m going with this.\\nYes, I mean the compilation times, or even Cargo downloading _whole_ index of\\ncrates just so you can update that one dependency (and 3 millions of indirect\\ndeps). When I was doing AoC \u201822 in Rust, I\'ve set up `sccache` right away on the\\nfirst day.\\n\\nLet\'s move to the packaging of the Rust itself, it\'s tedious. Rust has a very\\nfast development cycle and doesn\'t even try to make the builds backward\\ncompatible. If there is a new release of Rust, there is a very high chance that\\nyou cannot build that release with anything other than **the latest** Rust\\nrelease. If you have ever touched the packaging, you know that this is something\\nthat can cause a lot of problems, cause you need the second-to-latest version to\\ncompile the latest version, don\'t forget that this applies inductively\u2026 People\\nrunning _Gentoo_ could tell you a lot about this.\\n\\n:::info\\n\\nCompiling the compilers takes usually more time than compiling the kernel\\nitself\u2026\\n\\n:::\\n\\nI cannot speak about packaging of Rust programs in other than RHEL-based\\ndistros, though I can speak about RHEL ecosystem. Fedora packaging guidelines\\nspecify that you need to build each and every dependency of the program\\nseparately. I wanted to try out _AlmaLinux_ and install Alacritty there and I\\nfailed miserably. The solution that worked, consisted of ignoring the packaging\\nguidelines, running `cargo build` and consuming the binaries afterwards.\\nDependencies of the Rust programs are of a similar nature as JS dependencies.\\n\\n> I\'m tipping my fedora[^2] in the general direction of the maintainers of Rust\\n> packages in RHEL ecosystem. I wouldn\'t be able to do this without losing my\\n> sanity.\\n\\n## Likes\\n\\nIf you\'ve come all the way here and you\'re a Rustacean, I believe I\'ve managed\\nto get your blood boiling, so it\'s time to finish this off by stuff I like about\\nRust. I doubt I will be able to cover everything, but I can try at least. You\\nhave to admit it\'s much easier to remember the bad stuff as opposed to the good.\\n:wink:\\n\\n### Workflow and toolchain\\n\\nI prefered using Rust for the _Advent of Code_ and _Codeforces_ as it provides\\na rather easy way to test the solutions before running them with the challenge\\ninput (or test runner). I can give an example from the _Advent of Code_:\\n\\n```rust\\nuse aoc_2023::*;\\n\\ntype Output1 = i32;\\ntype Output2 = Output1;\\n\\nstruct DayXX {}\\nimpl Solution<Output1, Output2> for DayXX {\\n fn new<P: AsRef<Path>>(pathname: P) -> Self {\\n let lines: Vec<String> = file_to_lines(pathname);\\n\\n todo!()\\n }\\n\\n fn part_1(&mut self) -> Output1 {\\n todo!()\\n }\\n\\n fn part_2(&mut self) -> Output2 {\\n todo!()\\n }\\n}\\n\\nfn main() -> Result<()> {\\n DayXX::main()\\n}\\n\\ntest_sample!(day_XX, DayXX, 42, 69);\\n```\\n\\nThis was the skeleton I\'ve used and the macro at the end is my own creation that\\nexpands to:\\n\\n```rust\\n#[cfg(test)]\\nmod day_XX {\\n use super::*;\\n\\n #[test]\\n fn part_1() {\\n let path = DayXX::get_sample(1);\\n let mut day = DayXX::new(path);\\n assert_eq!(day.part_1(), 42);\\n }\\n\\n #[test]\\n fn part_2() {\\n let path = DayXX::get_sample(2);\\n let mut day = DayXX::new(path);\\n assert_eq!(day.part_2(), 69);\\n }\\n}\\n```\\n\\nWhen you\'re solving the problem, all you need to do is switch between\\n`cargo test` and `cargo run` to check the answer to either sample or the\\nchallenge input itself.\\n\\nIntroduce [bacon] and it gets even better. Bacon is a CLI tool that wraps around\\nthe `cargo` and allows you to check, run, lint or run tests on each file save.\\nIt\'s a very pleasant thing for a so-called _compiler-assisted_ development.\\n\\nSpeaking of linting from within the bacon, you cannot leave out the [clippy].\\nNot only it can whip your ass because of errors, but it can also produce a lot\\nof helpful suggestions, for example passing slices by borrow instead of\\nborrowing the `Vec` itself when you don\'t need it.\\n\\n### Standard library\\n\\nThere\'s **a lot** included in the standard library. It almost feels like you\\nhave all you need[^4]. I like placeholders (like `todo!()`, `unreachable!()`,\\n`unimplemented!()`) to the extent of\\n[implementing](/cpp/exceptions-and-raii/placeholders) them as exceptions in C++.\\n\\nYou can find almost anything. Though you can also hit some very weird issues\\nwith some of the nuances of the type system.\\n\\n### `unsafe`\\n\\nThis might be something that people like to avoid as much as possible. However I\\nthink that forming a habit of commenting posibly unsafe operations in **any**\\nlanguage is a good habit, as I\'ve mentioned above. You should be able to argue\\nwhy you can do something safely, even if the compiler is not kicking your ass\\nbecause of it.\\n\\nExcerpt of such comment from work:\\n\\n```py\\n# SAFETY: Taking first package instead of specific package should be\\n# safe, since we have put a requirement on \xbbone\xab \u2039upstream_project_url\u203a\\n# per Packit config, i.e. even if we\'re dealing with a monorepo, there\\n# is only \xbbone\xab upstream. If there is one upstream, there is only one\\n# set of GPG keys that can be allowed.\\nreturn self.downstream_config.packages[\\n self.downstream_config._first_package\\n].allowed_gpg_keys\\n```\\n\\n### Traits\\n\\nOne of the other things I like are the traits. They are more restrictive than\\ntemplates or concepts in C++, but they\'re doing their job pretty good. If you\\nare building library and require multiple traits to be satisfied it means a lot\\nof copy-paste, but that\'s soon to be fixed by the [trait aliases].\\n\\n:::tip Comparing to other languages\\n\\nOn Wikipedia I\'ve seen trait being defined as a more restrictive type class as\\nyou may know it from the Haskell for example. C++ isn\'t behind either with its\\n_constraints and concepts_. I would say that we can order them in the following\\norder based on the complexity they can express:\\n\\n```\\nRust\'s trait < Haskell\'s type class < C++\'s concept\\n```\\n\\n:::\\n\\nYou can also hit some issues, like me when trying to support conversions between\\nunderlying numeric types of a 2D vectors or support for using an operator from\\nboth sides (I couldn\'t get `c * u` to work in the same way as `u * c` because\\nthe first one requires you to implement the trait of a built-in type).\\n\\n:::warning Implementation\\n\\nImplementing traits lies in\\n\\n```rust\\nimpl SomeTrait for SomeStruct {\\n // implementation goes here\\n}\\n```\\n\\nOne of the things I **would love to** see is being able to define the helper\\nfunctions within the same block. As of now, the only things allowed are the ones\\nthat are required by the trait, which in the end results in a randomly lying\\nfunctions around (or in a implementation of the structure itself). I don\'t like\\nthis mess at all\u2026\\n\\n:::\\n\\n### Influence of functional paradigm\\n\\nYou can see a big influence of the functional paradigm. Not only in iterators,\\nbut also in the other parts of the language. For example I prefer `Option<T>` or\\n`Result<T, E>` to `null`s and exceptions. Pattern matching together with\\ncompiler both enforces handling of the errors and rather user-friendly way of\\ndoing it.\\n\\nNot to mention `.and_then()` and such. However spending most of the time with\\nthe AoC you get pretty annoyed of the repetitive `.unwrap()` during parsing,\\nsince you are guaranteed correct input.\\n\\n### Macros\\n\\nMacros are a very strong pro of the Rust. And no, we\'re not going to talk about\\nthe procedural macros\u2026\\n\\nAs I\'ve shown above I\'ve managed to \u201ctame\u201d a lot of copy-paste in the tests for\\nthe AoC by utilizing a macro that generated a very basic template for the tests.\\n\\nAs I have mentioned the traits above, I cannot forget to give props to `derive`\\nmacro that allows you to \u201cdeduce\u201d the default implementation. It is very helpful\\nfor a tedious tasks like implementing `Debug` (for printing out the structures)\\nor comparisons, though with the comparisons you need to be careful about the\\ndefault implementation, it has already bitten me once or twice.\\n\\n## Summary\\n\\nOverall there are many things about the Rust I like and would love to see them\\nimplemented in other languages. However there are also many things I don\'t like.\\nNothing is **exclusively** black and white.\\n\\n[advent of code]: https://adventofcode.com\\n[bacon]: https://dystroy.org/bacon/\\n[clippy]: https://github.com/rust-lang/rust-clippy\\n[codeforces]: https://codeforces.com\\n[trait aliases]: https://github.com/rust-lang/rfcs/blob/master/text/1733-trait-alias.md\\n\\n[^1]:\\n not to even mention multiple different packaging standards Python has, which\\n is borderline https://xkcd.com/927/\\n\\n[^2]: pun intended\\n[^3]: It\'s not that easy with the Rust compiler, but OK\u2026\\n[^4]:\\n unlike Python where there\'s whole universe in the language itself, yet there\\n are essential things not present\u2026"},{"id":"/2023/08/02/copr","metadata":{"permalink":"/blog/2023/08/02/copr","editUrl":"https://github.com/mfocko/blog/tree/main/blog/2023-08-02-copr.md","source":"@site/blog/2023-08-02-copr.md","title":"How can Copr help with broken dependencies","description":"Copr comes to save you when maintainer doesn\'t care.","date":"2023-08-02T00:00:00.000Z","formattedDate":"August 2, 2023","tags":[{"label":"\ud83c\udfed","permalink":"/blog/tags/\ud83c\udfed"},{"label":"red-hat","permalink":"/blog/tags/red-hat"},{"label":"copr","permalink":"/blog/tags/copr"},{"label":"admin","permalink":"/blog/tags/admin"},{"label":"vps","permalink":"/blog/tags/vps"}],"readingTime":3.44,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. your opinionated admin","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"How can Copr help with broken dependencies","description":"Copr comes to save you when maintainer doesn\'t care.","date":"2023-08-02T00:00:00.000Z","authors":[{"key":"mf","title":"a.k.a. your opinionated admin"}],"tags":["\ud83c\udfed","red-hat","copr","admin","vps"]},"unlisted":false,"prevItem":{"title":"Mixed feelings on Rust","permalink":"/blog/2024/01/28/rust-opinion"},"nextItem":{"title":"4th week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/4th-week"}},"content":"When you decide to run Fedora on your VPS, you might get screwed over by using\\nrandom repositories\u2026\\n\\n\x3c!--truncate--\x3e\\n\\nWhen I \u201creserved\u201d my VPS[^1] back in June \'20, I slapped Fedora on it without\\nthinking. I bet 99% of people would say that I\'m crazy for doing such thing[^2],\\n**BUT** I\'ve been using Fedora on my PCs for some time already and it felt very\\nstable and natural to just use, even for VPS.\\n\\nOne of the first things I\'ve done was setting up a mail server. You may guess\\nwhat\'s the fun part about having a mail server\u2026 Yes, it\'s all the spam you\\nreceive and only then you realize how much \u201ccrap\u201d gets filtered on free mail\\nservices. To battle this problem I chose to use\\n[rspamd](https://github.com/rspamd/rspamd) that had CentOS support, but someone\\nhad a [Copr](https://copr.fedorainfracloud.org/) repository that I used to\\ninstall it.\\n\\n## How does Copr repositories work?\\n\\nIf you have ever used Ubuntu, you might be familiar with the concept since it is\\nvery close to [PPAs](https://help.ubuntu.com/community/PPA).\\n\\ntl;dr of the whole process consists of\\n\\n1. enabling the Copr repository, and\\n2. installing the desired package.\\n\\nSo in shell you would do\\n\\n```\\n# dnf copr enable \u2039copr-repository\u203a\\n# dnf install \u2039package-from-the-repository\u203a\\n```\\n\\nAnd\u2026 that\'s it! Nothing else needed! Simple, right? And literally same process\\nas you would do for the PPA.\\n\\n:::tip AUR\\n\\nOn the other hand, if you are familiar with the archLinux, you definitely know\\nAUR and what it can do for you. Copr repository is pretty similar, but the\\npackages are prebuilt in Copr and Copr repositories can carry the required\\ndependencies for said packages, which simplifies the distribution, and can even\\nhelp with installing singular packages (when you just need the dependency, not\\neverything).\\n\\n:::\\n\\n## My issue\\n\\nNow you might wonder how would I use it on my VPS. It\'s rather simple, once in\\n6 months a new Fedora release comes out. And you need to upgrade to newer\\nrelease\u2026 You don\'t need to do it right away and for such setup it probably isn\'t\\neven recommended.\\n\\n:::tip\\n\\nFedora releases are supported for a year, i.e. they live 6 months till the next\\nrelease and then another 6 months till another release.\\n\\nSome people prefer to run one version \u201cbehind\u201d. If you ever decide to run it on\\nyour home server or in a similar setup, it might be a pretty good idea to\\nfollow. I\'m using the \u201clatest greatest\u201d, cause why not :smile:\\n\\nOne way or another, you still need to bump the release every six months, unless\\nyou\'d bump 2 releases at once every year, which would be a decision, since, at\\nleast I, cannot see any benefits in it\u2026 You don\'t go for \u201cstability\u201d, cause once\\na year you switch to the latest release and then, before you bump, you use one\\nyear old software, so you\'re not even using the latest.\\n\\n:::\\n\\nFast-forward 2 years in the future, new Fedora release came out (October \'22)\\nand I was doing an upgrade. Dependencies of the rspamd have been updated and\\nrspamd builds in Copr have failed and no one fixed it. Cool, so now I can\\nupgrade, but can either ignore the dependencies or uninstall the rspamd\u2026\\n\\n## How can Copr help?\\n\\nI have managed to find\\n[specfile](https://github.com/rspamd/rspamd/blob/master/rpm/rspamd.spec) for the\\nrspamd package that they use for CentOS. There were some files apart from the\\nspecfile, so I had to make an SRPM locally and then\u2026 I just uploaded the SRPM\\nto the Copr to\\n[build](https://copr.fedorainfracloud.org/coprs/mfocko/rspamd/build/5046567/)\\nan RPM.\\n\\nI have switched the previous Copr repository for rspamd with my own and happily\\nproceeded with the upgrade.\\n\\n## Conclusion\\n\\nCopr is heavily used for testing builds on the upstream with\\n[Packit](https://packit.dev). However, as you can see, it is possible to use it\\n**very well** for packaging your own stuff and avoiding issues (such as the one\\nI have described above), if need be.\\n\\n[^1]: [vpsFree.cz](https://vpsfree.cz)\\n[^2]:\\n Even though I\'ve been running archLinux on some Raspberry Pi\'s and also\\n on one of my \u201chome servers\u201d, before getting the VPS. You could say I like\\n to live on the edge\u2026"},{"id":"aoc-2022/4th-week","metadata":{"permalink":"/blog/aoc-2022/4th-week","editUrl":"https://github.com/mfocko/blog/tree/main/blog/aoc-2022/04-week-4.md","source":"@site/blog/aoc-2022/04-week-4.md","title":"4th week of Advent of Code \'22 in Rust","description":"Surviving fourth week in Rust.","date":"2023-07-07T15:14:00.000Z","formattedDate":"July 7, 2023","tags":[{"label":"advent-of-code","permalink":"/blog/tags/advent-of-code"},{"label":"advent-of-code-2022","permalink":"/blog/tags/advent-of-code-2022"},{"label":"rust","permalink":"/blog/tags/rust"}],"readingTime":15.175,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"4th week of Advent of Code \'22 in Rust","description":"Surviving fourth week in Rust.","date":"2023-07-07T15:14","slug":"aoc-2022/4th-week","authors":"mf","tags":["advent-of-code","advent-of-code-2022","rust"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"How can Copr help with broken dependencies","permalink":"/blog/2023/08/02/copr"},"nextItem":{"title":"3rd week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/3rd-week"}},"content":"Let\'s go through the fourth week of [_Advent of Code_] in Rust.\\n\\n\x3c!--truncate--\x3e\\n\\n## [Day 22: Monkey Map](https://adventofcode.com/2022/day/22)\\n\\n:::info tl;dr\\n\\nSimulating a movement on a 2D map with given instructions. Map becomes a cube in\\nthe 2nd part\u2026\\n\\n:::\\n\\n:::caution Rant\\n\\nThis was the most obnoxious problem of this year\u2026 and a lot of Rust issues have\\nbeen hit.\\n\\n:::\\n\\n### Solution\\n\\nIt seems like a very simple problem to solve, but with very obnoxious changes in\\nthe 2nd part and also it\'s relatively hard to decompose \xbbproperly\xab.\\n\\n#### Column iterator\\n\\nIn the first part of the problem it was needed to know the boundaries of each\\nrow and column, since I stored them in `Vec<Vec<char>>` and padded with spaces\\nto ensure I have a rectangular 2D \u201carray\u201d. However when you wanted to go through\\neach row and column to determine the boundaries, it was very easy to do for the\\nrows (cause each row is a `Vec` element), but not for the columns, since they\\nspan multiple rows.\\n\\nFor this use case I have implemented my own _column iterator_:\\n\\n```rust\\npub struct ColumnIterator<\'a, T> {\\n map: &\'a [Vec<T>],\\n column: usize,\\n\\n i: usize,\\n}\\n\\nimpl<\'a, T> ColumnIterator<\'a, T> {\\n pub fn new(map: &\'a [Vec<T>], column: usize) -> ColumnIterator<\'a, T> {\\n Self { map, column, i: 0 }\\n }\\n}\\n\\nimpl<\'a, T> Iterator for ColumnIterator<\'a, T> {\\n type Item = &\'a T;\\n\\n fn next(&mut self) -> Option<Self::Item> {\\n if self.i >= self.map.len() {\\n return None;\\n }\\n\\n self.i += 1;\\n Some(&self.map[self.i - 1][self.column])\\n }\\n}\\n```\\n\\nGiven this piece of an iterator, it is very easy to factor out the common\\nfunctionality between the rows and columns into:\\n\\n```rust\\nlet mut find_boundaries = |constructor: fn(usize) -> Orientation,\\n iterator: &mut dyn Iterator<Item = &char>,\\n upper_bound,\\n i| {\\n let mut first_non_empty = iterator.enumerate().skip_while(|&(_, &c)| c == \' \');\\n let start = first_non_empty.next().unwrap().0 as isize;\\n\\n let mut last_non_empty = first_non_empty.skip_while(|&(_, &c)| c != \' \');\\n let end = last_non_empty.next().unwrap_or((upper_bound, &\'_\')).0 as isize;\\n\\n boundaries.insert(constructor(i), start..end);\\n};\\n```\\n\\nAnd then use it as such:\\n\\n```rust\\n// construct all horizontal boundaries\\n(0..map.len()).for_each(|row| {\\n find_boundaries(\\n Orientation::horizontal,\\n &mut map[row].iter(),\\n map[row].len(),\\n row,\\n );\\n});\\n\\n// construct all vertical boundaries\\n(0..map[0].len()).for_each(|col| {\\n find_boundaries(\\n Orientation::vertical,\\n &mut ColumnIterator::new(&map, col),\\n map.len(),\\n col,\\n );\\n});\\n```\\n\\n#### Walking around the map\\n\\nOnce the 2nd part got introduced, you start to think about a way how not to\\ncopy-paste a lot of stuff (I haven\'t avoided it anyways\u2026). In this problem, I\'ve\\nchosen to introduce a trait (i.e. _interface_) for 2D and 3D walker.\\n\\n```rust\\ntrait Wrap: Clone {\\n type State;\\n\\n // simulation\\n fn is_blocked(&self) -> bool;\\n fn step(&mut self, steps: isize);\\n fn turn_left(&mut self);\\n fn turn_right(&mut self);\\n\\n // movement\\n fn next(&self) -> (Self::State, Direction);\\n\\n // final answer\\n fn answer(&self) -> Output;\\n}\\n```\\n\\nEach walker maintains its own state and also provides the functions that are\\nused during the simulation. The \u201cpromised\u201d methods are separated into:\\n\\n- _simulation_-related: that are used during the simulation from the `.fold()`\\n- _movement_-related: just a one method that holds most of the logic differences\\n between 2D and 3D\\n- _final answer_: which extracts the _proof of solution_ from the\\n implementation-specific walker\\n\\nBoth 2D and 3D versions borrow the original input and therefore you must\\nannotate the lifetime of it:\\n\\n```rust\\nstruct Wrap2D<\'a> {\\n input: &\'a Input,\\n position: Position,\\n direction: Direction,\\n}\\nimpl<\'a> Wrap2D<\'a> {\\n fn new(input: &\'a Input) -> Wrap2D<\'a> {\\n// \u2026\\n```\\n\\n#### Problems\\n\\nI have used a lot of closures for this problem and once I introduced a parameter\\nthat was of unknown type (apart from the fact it implements a specific trait), I\\ngot suggested a \u201cfix\u201d for the compilation error that resulted in something that\\nwas not possible to parse, cause it, more than likely, violated the grammar.\\n\\nIn a similar fashion, I have been suggested changes that led to a code that\\ndidn\'t make sense by just looking at it (there was no need to try the changes),\\nfor example one suggested change in the closure parameter caused disapperance of\\nthe parameter name. :smile:\\n\\n#### Clippy\\n\\nI have to admit that Clippy was rather helpful here, I\'ll include two examples\\nof rather smart suggestions.\\n\\nWhen writing the parsing for this problem, the first thing I have spotted on the\\n`char` was the `.is_digit()` function that takes a radix as a parameter. Clippy\\nnoticed that I use `radix = 10` and suggested switching to `.is_ascii_digit()`\\nthat does exactly the same thing:\\n\\n```diff\\n- .take_while(|c| c.is_digit(10))\\n+ .take_while(|c| c.is_ascii_digit())\\n```\\n\\nAnother useful suggestion appeared when working with the iterators and I wanted\\nto get the $n$-th element from it. You know the `.skip()`, you know the\\n`.next()`, just \u201cslap\u201d them together and we\'re done for :grin: Well, I got\\nsuggested to use `.nth()` that does exactly the combination of the two mentioned\\nmethods on iterators:\\n\\n```diff\\n- match it.clone().skip(skip).next().unwrap() {\\n+ match it.clone().nth(skip).unwrap() {\\n```\\n\\n## [Day 23: Unstable Diffusion](https://adventofcode.com/2022/day/23)\\n\\n:::info tl;dr\\n\\nSimulating movement of elves around with a set of specific rules.\\n\\n:::\\n\\n### Solution\\n\\nThere\'s not much to mention since it\'s just a cellular automaton simulation\\n(even though the AoC rules for cellular automatons usually get out of hand\\n:wink:).\\n\\nAlthough I had a need to determine boundaries of the elves\' positions and ended\\nup with a nasty DRY violation. Knowing that you you\'re looking for maximum and\\nminimum that are, of course, exactly the same except for initial values and\\ncomparators, it looks like a rather simple fix, but typing in Rust is something\\nelse, right? In the end I settled for a function that computes both boundaries\\nwithout any duplication while using a closure:\\n\\n```rust\\nfn get_bounds(positions: &Input) -> (Vector2D<isize>, Vector2D<isize>) {\\n let f = |init, cmp: &dyn Fn(isize, isize) -> isize| {\\n positions\\n .iter()\\n .fold(Vector2D::new(init, init), |acc, elf| {\\n Vector2D::new(cmp(acc.x(), elf.x()), cmp(acc.y(), elf.y()))\\n })\\n };\\n\\n (f(isize::MAX, &min::<isize>), f(isize::MIN, &max::<isize>))\\n}\\n```\\n\\nThis function returns a pair of 2D vectors that represent opposite points of the\\nbounding rectangle of all elves.\\n\\nYou might ask why would we need a closure and the answer is that `positions`\\ncannot be captured from within the nested function, only via closure. One more\\nfun fact on top of that is the type of the comparator\\n\\n```rust\\n&dyn Fn(isize, isize) -> isize\\n```\\n\\nOnce we remove the `dyn` keyword, compiler yells at us and also includes a way\\nhow to get a more thorough explanation of the error by running\\n\\n $ rustc --explain E0782\\n\\nwhich shows us\\n\\n Trait objects must include the `dyn` keyword.\\n\\n Erroneous code example:\\n\\n ```\\n trait Foo {}\\n fn test(arg: Box<Foo>) {} // error!\\n ```\\n\\n Trait objects are a way to call methods on types that are not known until\\n runtime but conform to some trait.\\n\\n Trait objects should be formed with `Box<dyn Foo>`, but in the code above\\n `dyn` is left off.\\n\\n This makes it harder to see that `arg` is a trait object and not a\\n simply a heap allocated type called `Foo`.\\n\\n To fix this issue, add `dyn` before the trait name.\\n\\n ```\\n trait Foo {}\\n fn test(arg: Box<dyn Foo>) {} // ok!\\n ```\\n\\n This used to be allowed before edition 2021, but is now an error.\\n\\n:::danger Rant\\n\\nNot all of the explanations are helpful though, in some cases they might be even\\nmore confusing than helpful, since they address _very simple_ use cases.\\n\\nAs you can see, even in this case there are two sides to the explanations:\\n\\n- it explains why you need to use `dyn`, but\\n- it still mentions that trait objects need to be heap-allocated via `Box<T>`\\n that, as you can see in my snippet, **does not** apply here :smile: IMO it\'s\\n caused by the fact that we are borrowing it and therefore we don\'t need to\\n care about the size or whereabouts of it.\\n\\n:::\\n\\n:::info C++ parallel\\n\\nIf you dive into the explanation above, you can notice that the `Box<dyn Trait>`\\npattern is very helpful for using types that are not known during compile-time.\\nYou would use a very similar approach in C++ when parsing some data structure\\nfrom input (let\'s say JSON for example).\\n\\nOn the other hand, in this case, it doesn\'t really make much sense, cause you\\ncan clearly see that the types **are known** during the compile-time, which in\\nC++ could be easily resolved by templating the helper function.\\n\\n:::\\n\\n## [Day 24: Blizzard Basin](https://adventofcode.com/2022/day/24)\\n\\n:::info tl;dr\\n\\nNavigating your way through a basin with series of blizzards that move around\\nyou as you move.\\n\\n:::\\n\\n:::caution\\n\\nIt\'s second to last day and I went \u201c_bonkers_\u201d on the Rust :smile: Proceed to\\nread _Solution_ part on your own risk.\\n\\n:::\\n\\n### Solution\\n\\nYou are given a map with blizzards all over the place and you\'re supposed to\\nfind the minimum time it requires you to walk through the basin without getting\\nin any of the blizzards.\\n\\n#### Breakdown\\n\\nRelatively simple, yet a bit annoying, approach can be taken. It\'s technically\\na shortest-path algorithm implementation with some relaxation restrictions and\\nbeing able to stay on one position for some time, so each _vertex_ of the graph\\nis determined by the position on the map and the _timestamp_. I have chosen to\\nuse `Vector3D<usize>`, since `x` and `y` attributes can be used for the position\\nand, well, let\'s use `z` for a timestamp, cause why not, right? :wink:\\n\\n#### Evaluating the blizzards\\n\\n:::caution\\n\\nI think that this is the most perverted abuse of the traits in the whole 4 weeks\\nof AoC in Rust\u2026\\n\\n:::\\n\\nThe blizzards move along their respective directions in time and loop around in\\ntheir respective row/column. Each vertex holds position **and** time, so we can\\n_just_ index the basin with the vertex itself, right? Yes, we can :smiling_imp:\\n\\n:::tip Fun fact\\n\\nWhile writing this part, I\'ve recognized unnecessary verbosity in the code and\\ncleaned it up a bit. The changed version is shown here and the original was just\\nmore verbose.\\n\\n:::\\n\\nI\'ll skip the boring parts of checking bounds and entry/exit of the basin :wink:\\nWe can easily calculate positions of the blizzards using a modular arithmetics:\\n\\n```rust\\nimpl Index<Position> for Basin {\\n type Output = char;\\n\\n fn index(&self, index: Position) -> &Self::Output {\\n // \u2039skipped boring parts\u203a\\n\\n // We need to account for the loops of the blizzards\\n let width = self.cols - 2;\\n let height = self.rows - 2;\\n\\n let blizzard_origin = |size, d, t, i| ((i - 1 + size + d * (t % size)) % size + 1) as usize;\\n [\\n (\\n index.y() as usize,\\n blizzard_origin(width, -1, index.z(), index.x()),\\n \'>\',\\n ),\\n (\\n index.y() as usize,\\n blizzard_origin(width, 1, index.z(), index.x()),\\n \'<\',\\n ),\\n (\\n blizzard_origin(height, -1, index.z(), index.y()),\\n index.x() as usize,\\n \'v\',\\n ),\\n (\\n blizzard_origin(height, 1, index.z(), index.y()),\\n index.x() as usize,\\n \'^\',\\n ),\\n ]\\n .iter()\\n .find_map(|&(y, x, direction)| {\\n if self.map[y][x] == direction {\\n Some(&self.map[y][x])\\n } else {\\n None\\n }\\n })\\n .unwrap_or(&\'.\')\\n }\\n}\\n```\\n\\nAs you can see, there is an expression for calculating the original position and\\nit\'s used multiple times, so why not take it out to a lambda, right? :wink:\\n\\nI couldn\'t get the `rustfmt` to format the `for`-loop nicely, so I\'ve just\\ndecided to go with iterating over an elements of a slice. I have used, once\\nagain, a combination of two functions (`find_map` in this case) to do 2 things\\nat once and at the end, if we haven\'t found any blizzard, we just return the\\nempty space.\\n\\nI think it\'s a very _nice_ (and naughty) way how to use the `Index` trait, don\'t\\nyou think?\\n\\n#### Shortest-path algorithm\\n\\nFor the shortest path you can choose and adjust any of the common shortest-path\\nalgorithms, in my case, I have decided to use [_A\\\\*_] instead of Dijkstra\'s\\nalgorithm, since it better reflects the _cost_ function.\\n\\n:::info Comparison of costs\\n\\nWith the Dijkstra\'s algorithm I would proceed with the `time` attribute used as\\na priority for the queue.\\n\\nWhereas with the _A\\\\*_, I have chosen to use both time and Manhattan distance\\nthat promotes vertices closer to the exit **and** with a minimum time taken.\\n\\n:::\\n\\nCost function is, of course, a closure :wink:\\n\\n```rust\\nlet cost = |p: Position| p.z() as usize + exit.y().abs_diff(p.y()) + exit.x().abs_diff(p.x());\\n```\\n\\nAnd also for checking the possible moves from the current vertex, I have\\nimplemented, yet another, closure that yields an iterator with the next moves:\\n\\n```rust\\nlet next_positions = |p| {\\n [(0, 0, 1), (0, -1, 1), (0, 1, 1), (-1, 0, 1), (1, 0, 1)]\\n .iter()\\n .filter_map(move |&(x, y, t)| {\\n let next_p = p + Vector3D::new(x, y, t);\\n\\n if basin[next_p] == \'.\' {\\n Some(next_p)\\n } else {\\n None\\n }\\n })\\n};\\n```\\n\\n#### Min-heap\\n\\nIn this case I had a need to use the priority queue taking the elements with the\\nlowest cost as the prioritized ones. Rust only offers you the [`BinaryHeap`] and\\nthat is a max-heap. One of the ways how to achieve a min-heap is to put the\\nelements in wrapped in a [`Reverse`] (as is even showed in the linked [docs of\\nthe `BinaryHeap`]). However the wrapping affects the type of the heap and also\\npopping the most prioritized elements yields values wrapped in the `Reverse`.\\n\\nFor this purpose I have just taken the max-heap and wrapped it as a whole in a\\nseparate structure providing just the desired methods:\\n\\n```rust\\nuse std::cmp::{Ord, Reverse};\\nuse std::collections::BinaryHeap;\\n\\npub struct MinHeap<T> {\\n heap: BinaryHeap<Reverse<T>>,\\n}\\n\\nimpl<T: Ord> MinHeap<T> {\\n pub fn new() -> MinHeap<T> {\\n MinHeap {\\n heap: BinaryHeap::new(),\\n }\\n }\\n\\n pub fn push(&mut self, item: T) {\\n self.heap.push(Reverse(item))\\n }\\n\\n pub fn pop(&mut self) -> Option<T> {\\n self.heap.pop().map(|Reverse(x)| x)\\n }\\n}\\n\\nimpl<T: Ord> Default for MinHeap<T> {\\n fn default() -> Self {\\n Self::new()\\n }\\n}\\n```\\n\\nRest is just the algorithm implementation which is not that interesting.\\n\\n## [Day 25: Full of Hot Air](https://adventofcode.com/2022/day/25)\\n\\n:::info tl;dr\\n\\nPlaying around with a numbers in a _special_ base.\\n\\n:::\\n\\nGetting flashbacks to the _IB111 Foundations of Programming_\u2026 Very nice \u201cproblem\u201d\\nwith a rather easy solution, as the last day always seems to be.\\n\\n### Solution\\n\\nImplementing 2 functions, converting from the _SNAFU base_ and back to the _SNAFU_\\n_base_ representation. Let\'s do a bit more though! I have implemented two functions:\\n\\n- `from_snafu`\\n- `to_snafu`\\n\\nNow it is apparent that all I do is number to string and string to number. Hmm\u2026\\nthat sounds familiar, doesn\'t it? Let\'s introduce a structure for the SNAFU numbers\\nand implement the traits that we need.\\n\\nLet\'s start with a structure:\\n\\n```rust\\n#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]\\nstruct SNAFU {\\n value: i64,\\n}\\n```\\n\\n#### Converting from `&str`\\n\\nWe will start by implementing the `FromStr` trait that will help us parse our input.\\nThis is rather simple, I can just take the `from_snafu` function, copy-paste it\\ninto the `from_str` method and the number I get will be wrapped in `Result` and\\n`SNAFU` structure.\\n\\n#### Converting to `String`\\n\\nThis is more fun. In some cases you need to implement only one trait and others\\nare automatically implemented using that one trait. In our case, if you look in\\nthe documentation, you can see that `ToString` trait is automatically implemented\\nfor any type that implements `Display` trait.\\n\\nLet\'s implement the `Display` trait then. We should be able to use the `to_snafu`\\nfunction and just take the `self.value` from the `SNAFU` structure.\\n\\nAnd for the convenience of tests, we can also implement a rather simple `From<i64>`\\ntrait for the `SNAFU`.\\n\\n#### Adjusting the code\\n\\nAfter those changes we need to adjust the code and tests.\\n\\nParsing of the input is very easy, before we have used the lines, now we parse\\neverything:\\n\\n```diff\\n fn parse_input<P: AsRef<Path>>(pathname: P) -> Input {\\n- file_to_lines(pathname)\\n+ file_to_structs(pathname)\\n }\\n```\\n\\nPart 1 needs to be adjusted a bit too:\\n\\n```diff\\n fn part_1(input: &Input) -> Output {\\n- to_snafu(input.iter().map(|s| from_snafu(s)).sum())\\n+ SNAFU::from(input.iter().map(|s| s.value).sum::<i64>()).to_string()\\n }\\n```\\n\\nYou can also see that it simplifies the meaning a bit and it is more explicit than\\nthe previous versions.\\n\\nAnd for the tests:\\n\\n```diff\\n #[test]\\n fn test_from() {\\n- for (n, s) in EXAMPLES.iter() {\\n- assert_eq!(from_snafu(s), *n);\\n+ for (&n, s) in EXAMPLES.iter() {\\n+ assert_eq!(s.parse::<SNAFU>().unwrap().value, n);\\n }\\n }\\n\\n #[test]\\n fn test_to() {\\n- for (n, s) in EXAMPLES.iter() {\\n- assert_eq!(to_snafu(*n), s.to_string());\\n+ for (&n, s) in EXAMPLES.iter() {\\n+ assert_eq!(SNAFU::from(n).to_string(), s.to_string());\\n }\\n```\\n\\n## Summary\\n\\nLet\'s wrap the whole thing up! Keeping in mind both AoC and the Rust\u2026\\n\\n![Finished advent calendar :smile:](/img/blog/aoc-2022/04-week-4/calendar.png)\\n\\n### Advent of Code\\n\\nThis year was quite fun, even though most of the solutions and posts came in\\nlater on (_cough_ in \'23 _cough_). Day 22 was the most obnoxious one\u2026 And also\\nit feels like I used priority queues and tree data structures **a lot** :eyes:\\n\\n### with Rust\\n\\nI must admit that a lot of compiler warnings and errors were very useful. Even\\nthough I still found some instances where they didn\'t help at all or cause even\\nworse issues than I had. Compilation times have been addressed with the caching.\\n\\nBuilding my first tree data structure in Rust has been a very \u201cinteresting\u201d\\njourney. Being able to write a more generic BFS algorithm that allows you to not\\nduplicate code while still mantaining the desired functionality contributes to\\na very readable code.\\n\\nI am definitely much more aware of the basic things that bloated Python is\\nmissing, yet Rust has them\u2026\\n\\nUsing explicit types and writing down placeholder functions with `todo!()`\\nmacros is very pleasant, since it allows you to easily navigate the type system\\nduring the development when you don\'t even need to be sure how are you going to\\nput the smaller pieces together.\\n\\nI have used a plethora of traits and also implemented some of them to either be\\nidiomatic, or exploit the syntactic sugar they offer. Deriving the default trait\\nimplementation is also very helpful in a lot of cases, e.g. debugging output,\\ncopying, equality comparison, etc.\\n\\nI confess to touching more \u201ccursed\u201d parts of the Rust, such as macros to\\ndeclutter the copy-paste for tests or writing my own structures that need to\\ncarry a lifetime for their own fields.\\n\\ntl;dr Relatively pleasant language until you hit brick wall :wink:\\n\\n---\\n\\nSee you next year! Maybe in Rust, maybe not :upside_down_face:\\n\\n[_advent of code_]: https://adventofcode.com\\n[_a\\\\*_]: https://en.wikipedia.org/wiki/A*_search_algorithm\\n[`binaryheap`]: https://doc.rust-lang.org/std/collections/struct.BinaryHeap.html\\n[`reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html\\n[docs of the `binaryheap`]: https://doc.rust-lang.org/std/collections/struct.BinaryHeap.html#min-heap"},{"id":"aoc-2022/3rd-week","metadata":{"permalink":"/blog/aoc-2022/3rd-week","editUrl":"https://github.com/mfocko/blog/tree/main/blog/aoc-2022/03-week-3.md","source":"@site/blog/aoc-2022/03-week-3.md","title":"3rd week of Advent of Code \'22 in Rust","description":"Surviving third week in Rust.","date":"2023-07-06T21:00:00.000Z","formattedDate":"July 6, 2023","tags":[{"label":"advent-of-code","permalink":"/blog/tags/advent-of-code"},{"label":"advent-of-code-2022","permalink":"/blog/tags/advent-of-code-2022"},{"label":"rust","permalink":"/blog/tags/rust"}],"readingTime":11.57,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"3rd week of Advent of Code \'22 in Rust","description":"Surviving third week in Rust.","date":"2023-07-06T21:00","slug":"aoc-2022/3rd-week","authors":"mf","tags":["advent-of-code","advent-of-code-2022","rust"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"4th week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/4th-week"},"nextItem":{"title":"Sort the matrix diagonally","permalink":"/blog/leetcode/sort-diagonally"}},"content":"Let\'s go through the third week of [_Advent of Code_] in Rust.\\n\\n\x3c!--truncate--\x3e\\n\\n## [Day 15: Beacon Exclusion Zone](https://adventofcode.com/2022/day/15)\\n\\n:::info tl;dr\\n\\nTriangulating a distress beacon based on the information from the sensors.\\n\\n:::\\n\\n### Solution\\n\\nRelatively easy thing to implement, no major Rust issues hit.\\n\\n## [Day 16: Proboscidea Volcanium](https://adventofcode.com/2022/day/16)\\n\\n:::info tl;dr\\n\\nFinding a max flow in a graph given some time constraints.\\n\\n:::\\n\\n### Solution\\n\\nI have used some interesting things to implement this and make it easier for me.\\n\\n#### Indexing in graph\\n\\nI have come across a situation where I needed to keep more information regarding\\nthe graph\u2026 In that case you can, of course, create a structure and keep it in,\\nbut once you have multiple members in the structure it gets harder to work with\\nsince you need to address the fields in the structure. When you work with graph,\\nyou frequently need to access the vertices and in this case it felt a lot easier\\nto implement the indexing in a graph, rather than explicitly access the\\nunderlying data structure.\\n\\nHere you can see a rather short snippet from the solution that allows you to\\n\u201cindex\u201d the graph:\\n\\n```rust\\nimpl Index<&str> for Graph {\\n type Output = Vertex;\\n\\n fn index(&self, index: &str) -> &Self::Output {\\n &self.g[index]\\n }\\n}\\n```\\n\\n#### Cartesian product\\n\\nDuring the implementation I had to utilize Floyd-Warshall algorithm for finding\\nthe shortest path between pairs of vertices and utilized the `iproduct!` macro\\nfrom the [`itertools`]. It is a very useful higher-order function that allows\\nyou to keep the nesting of the loops at a minimum level while still maintaining\\nthe same functionality.\\n\\n#### \u201cImplementing\u201d an iterator\\n\\nFor the second part, you get to split the work between 2 actors. That way you\\ncan achieve higher efficiency of the whole process that you\'re planning, but it\\nalso makes it harder to evaluate algorithmically, since you need to check the\\ndifferent ways the work can be split.\\n\\nBeing affected by _functional programming brain damage_:tm:, I have chosen to\\ndo this part by function that returns an iterator over the possible ways:\\n\\n```rust\\nfn pairings(\\n valves: &BTreeSet<String>,\\n) -> impl Iterator<Item = (BTreeSet<String>, BTreeSet<String>)> + \'_ {\\n let mapping = valves.iter().collect_vec();\\n\\n let max_mask = 1 << (valves.len() - 1);\\n\\n (0..max_mask).map(move |mask| {\\n let mut elephant = BTreeSet::new();\\n let mut human = BTreeSet::new();\\n\\n for (i, &v) in mapping.iter().enumerate() {\\n if (mask & (1 << i)) == 0 {\\n human.insert(v.clone());\\n } else {\\n elephant.insert(v.clone());\\n }\\n }\\n\\n (human, elephant)\\n })\\n}\\n```\\n\\n## [Day 17: Pyroclastic Flow](https://adventofcode.com/2022/day/17)\\n\\n:::info tl;dr\\n\\nSimulating an autonomous Tetris where pieces get affected by a series of jets of\\nhot gas.\\n\\n:::\\n\\n### Solution\\n\\nSimilarly to the previous day I have created some iterators :smile:\\n\\n#### Collision detection\\n\\nOnce you need to check for collisions it is very helpful to be able to just\\niterate through the positions that can actually collide with the wall or other\\npiece.\\n\\nTo get the desired behaviour, you can just compose few smaller functions:\\n\\n```rust\\nfn occupied(shape: &[Vec<char>]) -> impl Iterator<Item = Position> + \'_ {\\n shape.iter().enumerate().flat_map(|(y, row)| {\\n row.iter().enumerate().filter_map(move |(x, c)| {\\n if c == &\'#\' {\\n Some(Vector2D::new(x as isize, y as isize))\\n } else {\\n None\\n }\\n })\\n })\\n}\\n```\\n\\nIn the end, we get relative positions which we can adjust later when given the\\nspecific positions from iterator. You can see some interesting parts in this:\\n\\n- `.enumerate()` allows us to get both the indices (coordinates) and the line\\n or, later on, the character itself,\\n- `.flat_map()` flattens the iterator, i.e. when we return another iterator,\\n they just get chained instead of iterating over iterators (which sounds pretty\\n disturbing, doesn\'t it?),\\n- and finally `.filter_map()` which is pretty similar to the \u201cbasic\u201d `.map()`\\n with a one, key, difference that it expects the items of an iterator to be\\n mapped to an `Option<T>` from which it ignores nothing (as in `None` :wink:)\\n and also unwraps the values from `Some(\u2026)`.\\n\\n#### Infinite iterator\\n\\nIn the solution we cycle through both Tetris-like shapes that fall down and the\\njets that move our pieces around. Initially I have implemented my own infinite\\niterator that just yields the indices. It is a very simple, yet powerful, piece\\nof code:\\n\\n```rust\\nstruct InfiniteIndex {\\n size: usize,\\n i: usize,\\n}\\n\\nimpl InfiniteIndex {\\n fn new(size: usize) -> InfiniteIndex {\\n InfiniteIndex { size, i: size - 1 }\\n }\\n}\\n\\nimpl Iterator for InfiniteIndex {\\n type Item = usize;\\n\\n fn next(&mut self) -> Option<Self::Item> {\\n self.i = (self.i + 1) % self.size;\\n Some(self.i)\\n }\\n}\\n```\\n\\nHowever when I\'m looking at the code now, it doesn\'t really make much sense\u2026\\nGuess what, we can use a built-in function that is implemented on iterators for\\nthat! The function is called `.cycle()`\\n\\nOn the other hand, I am not going to switch to that function, since it would\\nintroduce an another myriad of issues caused by the fact that I create iterators\\nright away in the constructor of my structure and the iterators would borrow\\nboth the jets and shapes which would introduce a lifetime dependency into the\\nstructure.\\n\\n## [Day 18: Boiling Boulders](https://adventofcode.com/2022/day/18)\\n\\n:::info tl;dr\\n\\nLet\'s compute a surface area of some obsidian approximated via coordinates of\\ncubes.\\n\\n:::\\n\\n### Solution\\n\\nThis day is kinda interesting, because it shows how easily you can complicate the\\nproblem and also how much can you screw yourself over with the optimization and\\n\u201csmart\u201d approach.\\n\\nFor the first part you need to find the surface area of an obsidian that is\\napproximated by cubes. Now, that is a very easy thing to do, just keep the track\\nof already added cubes, and check if the newly added cube touches any face of any\\nother cube. Simple, and with a `BTreeSet` relatively efficient way to do it.\\n\\nHowever the second part lets you on a secret that there may be some surface area\\nfrom the \u201cinside\u201d too and you want to know only the one from the outside of the\\nobsidian. I have seen some solutions later, but if you check your data, you might\\nnotice that the bounding box of all the cubes isn\'t that big at all. Therefore I\\nchose to pre-construct the box beforehand, fill in the cubes and then just run a\\nBFS turning all the lava on the outside into the air. Now you just need to check\\ncubes and count how many of their faces touch the air.\\n\\n## [Day 19: Not Enough Minerals](https://adventofcode.com/2022/day/19)\\n\\n:::info tl;dr\\n\\nFinding out the best strategy for building robots to collect geodes.\\n\\n:::\\n\\n### Solution\\n\\nNot much interesting stuff to mention apart from the suggestion to never believe\\nthat the default implementation given by `derive` macro is what you want, it\\ndoesn\'t have to be. :smile:\\n\\n## [Day 20: Grove Positioning System](https://adventofcode.com/2022/day/20)\\n\\n:::info tl;dr\\n\\nShuffling around the _circular linked list_ to find the coordinates.\\n\\n:::\\n\\nNow, small rant for this day is in place. They\'ve never mentioned that coordinates\\ncan repeat and therefore the values are non-unique. This is something that did\\nnot happen in the given sample, but was present in the user input. It took \xbba lot\xab\\nto realize that this is the issue.\\n\\n### Solution\\n\\nI have tried implementing a circular linked list for this\u2026 and I have failed\\nmiserably. To be fair, I still have no clue why. It was \u201cfun\u201d to play around with\\nthe `Rc<RefCell<T>>`. In the end I failed on _wrong answer_. I have also encountered\\na rather interesting issue with `.borrow_mut()` method being used on `Rc<RefCell<T>>`.\\n\\n#### `.borrow_mut()`\\n\\nConsider the following snippet of the code (taken from the documentation):\\n\\n```rust\\nuse std::cell::{RefCell, RefMut};\\nuse std::collections::HashMap;\\nuse std::rc::Rc;\\n// use std::borrow::BorrowMut;\\n\\nfn main() {\\n let shared_map: Rc<RefCell<_>> = Rc::new(RefCell::new(HashMap::new()));\\n // Create a new block to limit the scope of the dynamic borrow\\n {\\n let mut map: RefMut<_> = shared_map.borrow_mut();\\n map.insert(\\"africa\\", 92388);\\n map.insert(\\"kyoto\\", 11837);\\n map.insert(\\"piccadilly\\", 11826);\\n map.insert(\\"marbles\\", 38);\\n }\\n\\n // Note that if we had not let the previous borrow of the cache fall out\\n // of scope then the subsequent borrow would cause a dynamic thread panic.\\n // This is the major hazard of using `RefCell`.\\n let total: i32 = shared_map.borrow().values().sum();\\n println!(\\"{total}\\");\\n}\\n```\\n\\nWe allocate a hash map on the heap and then in the inner block, we borrow it as\\na mutable reference, so that we can use it.\\n\\n:::note\\n\\nIt is a very primitive example for `Rc<RefCell<T>>` and mutable borrow.\\n\\n:::\\n\\nIf you uncomment the 4th line with `use std::borrow::BorrowMut;`, you cannot\\ncompile the code anymore, because of\\n\\n```\\n Compiling playground v0.0.1 (/playground)\\nerror[E0308]: mismatched types\\n --\x3e src/main.rs:10:34\\n |\\n10 | let mut map: RefMut<_> = shared_map.borrow_mut();\\n | --------- ^^^^^^^^^^^^^^^^^^^^^^^ expected struct `RefMut`, found mutable reference\\n | |\\n | expected due to this\\n |\\n = note: expected struct `RefMut<\'_, _>`\\n found mutable reference `&mut Rc<RefCell<HashMap<_, _>>>`\\n\\nerror[E0599]: no method named `insert` found for struct `RefMut<\'_, _>` in the current scope\\n --\x3e src/main.rs:11:13\\n |\\n11 | map.insert(\\"africa\\", 92388);\\n | ^^^^^^ method not found in `RefMut<\'_, _>`\\n\\nerror[E0599]: no method named `insert` found for struct `RefMut<\'_, _>` in the current scope\\n --\x3e src/main.rs:12:13\\n |\\n12 | map.insert(\\"kyoto\\", 11837);\\n | ^^^^^^ method not found in `RefMut<\'_, _>`\\n\\nerror[E0599]: no method named `insert` found for struct `RefMut<\'_, _>` in the current scope\\n --\x3e src/main.rs:13:13\\n |\\n13 | map.insert(\\"piccadilly\\", 11826);\\n | ^^^^^^ method not found in `RefMut<\'_, _>`\\n\\nerror[E0599]: no method named `insert` found for struct `RefMut<\'_, _>` in the current scope\\n --\x3e src/main.rs:14:13\\n |\\n14 | map.insert(\\"marbles\\", 38);\\n | ^^^^^^ method not found in `RefMut<\'_, _>`\\n\\nSome errors have detailed explanations: E0308, E0599.\\nFor more information about an error, try `rustc --explain E0308`.\\nerror: could not compile `playground` due to 5 previous errors\\n```\\n\\nIt might seem **a bit** ridiculous. However, I got to a point where the compiler\\nsuggested `use std::borrow::BorrowMut;` and it resulted in breaking parts of the\\ncode that worked previously. I think it may be a good idea to go over what is\\nhappening here.\\n\\n##### `.borrow_mut()` on `Rc<RefCell<T>>`\\n\\nLet\'s consider a variable `x` of type `Rc<RefCell<T>>`. What happens when you\\ncall `.borrow_mut()` on it? We can look at the `Rc` type, and\u2026 hang on! There is\\nneither `.borrow_mut()` method or `BorrowMut` trait implemented. How can we do it\\nthen?\\n\\nLet\'s go further and we can see that `RefCell<T>` implements a `.borrow_mut()`\\nmethod. OK, but how can we call it on the `Rc<T>`? Easily! `Rc<T>` implements\\n`Deref<T>` and therefore you can call methods on `Rc<T>` objects as if they were\\n`T` objects. If we read on _`Deref` coercion_, we can see the following:\\n\\n> If `T` implements `Deref<Target = U>`, \u2026:\\n>\\n> - \u2026\\n> - `T` implicitly implements all the (immutable) methods of the type `U`.\\n\\nWhat is the requirement for the `.borrow_mut()` on `RefCell<T>`? Well, it needs\\n`&self`, so the `Deref` implements the `.borrow_mut()` for the `Rc<RefCell<T>>`.\\n\\n##### `BorrowMut` trait\\n\\nI have not been able to find a lot on this trait. My guess is that it provides a\\nmethod instead of a syntactic sugar (`&mut x`) for the mutable borrow. And also\\nit provides default implementations for the types:\\n\\n```rust\\nimpl BorrowMut<str> for String\\n\\nimpl<T> BorrowMut<T> for &mut T\\nwhere\\n T: ?Sized,\\n\\nimpl<T> BorrowMut<T> for T\\nwhere\\n T: ?Sized,\\n\\nimpl<T, A> BorrowMut<[T]> for Vec<T, A>\\nwhere\\n A: Allocator,\\n\\nimpl<T, A> BorrowMut<T> for Box<T, A>\\nwhere\\n A: Allocator,\\n T: ?Sized,\\n\\nimpl<T, const N: usize> BorrowMut<[T]> for [T; N]\\n```\\n\\n##### Conflict\\n\\nNow the question is why did it break the code\u2026 My first take was that the type\\n`Rc<RefCell<T>>` has some _specialized_ implementation of the `.borrow_mut()` and\\nthe `use` overrides it with the default, which is true **in a sense**. However\\nthere is no _specialized_ implementation. Let\'s have a look at the trait and the\\ntype signature on the `RefCell<T>`:\\n\\n```rust\\n// trait\\npub trait BorrowMut<Borrowed>: Borrow<Borrowed>\\nwhere\\n Borrowed: ?Sized,\\n{\\n fn borrow_mut(&mut self) -> &mut Borrowed;\\n}\\n\\n// \u2039RefCell<T>.borrow_mut()\u203a type signature\\npub fn borrow_mut(&self) -> RefMut<\'_, T>\\n```\\n\\nI think that we can definitely agree on the fact that `RefMut<\'_, T>` is not the\\n`RefCell<T>`.\\n\\n**In my opinion**, `RefCell<T>` implements a **separate** `.borrow_mut()` rather\\nthan implementing the interface, because it **cannot** satisfy the type requirements\\nof the trait.\\n\\n:::caution\\n\\nI wonder how are we expected to deal with this conflict, if and when, we need\\nboth the `.borrow_mut()` of the trait and `.borrow_mut()` of the `RefCell<T>`.\\n\\n:::\\n\\n:::tip Fun fact\\n\\nI was suggested by the compiler to do `use std::borrow::BorrowMut;` and break the\\ncode.\\n\\nSo much for the _almighty_ and _helpful_ compiler\u2026\\n\\n:::\\n\\n## [Day 21: Monkey Math](https://adventofcode.com/2022/day/21)\\n\\n:::info tl;dr\\n\\nComputing an expression tree and then also finding ideal value for a node.\\n\\n:::\\n\\n### Solution\\n\\nRelatively simple, until you get to the 2nd part where you start to practice\\na lot of the copy-paste. I have managed to sneak some perverted stuff in there\\nthough :) Let\'s go through the details.\\n\\n#### `Default` trait\\n\\nFor the first time and twice I had a need to have a default value for my types,\\nenumerations in this case. Rust offers a very nice trait[^1] that is described\\nas:\\n\\n> A trait for giving a type a useful default value.\\n\\nI guess it sums it up nicely. The more interesting part about this is the fact\\nthat you can use the _macro machinery_ to save yourself some typing. If you have\\nenumeration of which the default value doesn\'t bear any parameter, you can just\\ndo[^2]:\\n\\n```rust\\n#[derive(Default)]\\nenum Color {\\n #[default]\\n White,\\n Gray,\\n Black,\\n}\\n```\\n\\n#### Abusing negation\\n\\nIf you want to use a _unary minus_ operator on your own type, you can implement\\na `Neg` trait[^3]. I was dealing with a binary tree and needed a way how to look\\nat the other side, so I have just implemented the negation for flipping between\\nleft and right :smile:\\n\\n[^1]: [`Default`](https://doc.rust-lang.org/std/default/trait.Default.html) docs\\n[^2]: Pardon my example from the graph algorithms ;)\\n[^3]: [`Neg`](https://doc.rust-lang.org/std/ops/trait.Neg.html) docs\\n\\n[_advent of code_]: https://adventofcode.com\\n[`itertools`]: https://crates.io/crates/itertools\\n[this reddit post and the comment]: https://www.reddit.com/r/adventofcode/comments/zb98pn/comment/iyq0ono"},{"id":"leetcode/sort-diagonally","metadata":{"permalink":"/blog/leetcode/sort-diagonally","editUrl":"https://github.com/mfocko/blog/tree/main/blog/leetcode/sort-matrix-diagonally.md","source":"@site/blog/leetcode/sort-matrix-diagonally.md","title":"Sort the matrix diagonally","description":"Compiler assisted development.","date":"2023-03-04T23:15:00.000Z","formattedDate":"March 4, 2023","tags":[{"label":"cpp","permalink":"/blog/tags/cpp"},{"label":"leetcode","permalink":"/blog/tags/leetcode"},{"label":"iterators","permalink":"/blog/tags/iterators"}],"readingTime":16.99,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"Sort the matrix diagonally","description":"Compiler assisted development.","date":"2023-03-04T23:15","slug":"leetcode/sort-diagonally","authors":"mf","tags":["cpp","leetcode","iterators"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"3rd week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/3rd-week"},"nextItem":{"title":"2nd week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/2nd-week"}},"content":"Let\'s try to solve one of the LeetCode challenges in easy and hard mode at the\\nsame time.\\n\\n\x3c!--truncate--\x3e\\n\\n- Link to the problem: https://leetcode.com/problems/sort-the-matrix-diagonally/\\n\\n## Problem description\\n\\nA **matrix diagonal** is a diagonal line of cells starting from some cell in\\neither the topmost row or leftmost column and going in the bottom-right direction\\nuntil reaching the matrix\'s end. For example, the **matrix diagonal** starting\\nfrom `mat[2][0]`, where `mat` is a `6 x 3` matrix, includes cells `mat[2][0]`,\\n`mat[3][1]`, and `mat[4][2]`.\\n\\nGiven an `m x n` matrix `mat` of integers, sort each matrix diagonal in ascending\\norder and return the resulting matrix.\\n\\n### Example\\n\\n![Image describing the problem](https://assets.leetcode.com/uploads/2020/01/21/1482_example_1_2.png)\\n\\n## Skeleton and initial adjustments\\n\\nWe are given the following skeleton for the C++ and the given challenge:\\n\\n```cpp\\nclass Solution {\\npublic:\\n vector<vector<int>> diagonalSort(vector<vector<int>>& mat) {\\n\\n }\\n};\\n```\\n\\nThe task is to sort the passed matrix diagonally and then return it. First of all,\\nI don\'t like to solve this in a web browser, so we\'ll need to adjust it accordingly\\nfor running it locally. We\'ll start by including the `vector` header and using\\nfully-qualified namespaces[^1] and also adding few tests:\\n\\n```cpp\\n#include <cassert>\\n#include <vector>\\n\\nusing matrix = std::vector<std::vector<int>>;\\n\\nclass Solution {\\npublic:\\n matrix diagonalSort(matrix& mat)\\n {\\n }\\n};\\n\\nstatic void test_case_1()\\n{\\n // Input: mat = [[3,3,1,1],[2,2,1,2],[1,1,1,2]]\\n // Output: [[1,1,1,1],[1,2,2,2],[1,2,3,3]]\\n\\n Solution s;\\n assert((s.diagonalSort(std::vector { std::vector { 3, 3, 1, 1 },\\n std::vector { 2, 2, 1, 2 },\\n std::vector { 1, 1, 1, 2 } })\\n == std::vector { std::vector { 1, 1, 1, 1 },\\n std::vector { 1, 2, 2, 2 },\\n std::vector { 1, 2, 3, 3 } }));\\n}\\n\\nstatic void test_case_2()\\n{\\n // Input: mat =\\n // [[11,25,66,1,69,7],[23,55,17,45,15,52],[75,31,36,44,58,8],[22,27,33,25,68,4],[84,28,14,11,5,50]]\\n // Output:\\n // [[5,17,4,1,52,7],[11,11,25,45,8,69],[14,23,25,44,58,15],[22,27,31,36,50,66],[84,28,75,33,55,68]]\\n\\n Solution s;\\n assert((s.diagonalSort(std::vector { std::vector { 11, 25, 66, 1, 69, 7 },\\n std::vector { 23, 55, 17, 45, 15, 52 },\\n std::vector { 75, 31, 36, 44, 58, 8 },\\n std::vector { 22, 27, 33, 25, 68, 4 },\\n std::vector { 84, 28, 14, 11, 5, 50 } })\\n == std::vector { std::vector { 5, 17, 4, 1, 52, 7 },\\n std::vector { 11, 11, 25, 45, 8, 69 },\\n std::vector { 14, 23, 25, 44, 58, 15 },\\n std::vector { 22, 27, 31, 36, 50, 66 },\\n std::vector { 84, 28, 75, 33, 55, 68 } }));\\n}\\n\\nint main()\\n{\\n test_case_1();\\n test_case_2();\\n\\n return 0;\\n}\\n```\\n\\nWe need to return the matrix, but we\'re given a reference to the input matrix. We\\ncan easily abuse the C++ here and just switch the reference to value, this way\\nthe matrix will be copied when passed to the function, we can sort the copy and\\njust return it back. And we also get yelled by the compiler for the fact that the\\nmethod doesn\'t return anything yet, so to make it \u201cshut up\u201d we will just return\\nthe input for now:\\n\\n```diff\\n- matrix diagonalSort(matrix& mat)\\n+ matrix diagonalSort(matrix mat)\\n {\\n+ return mat;\\n }\\n```\\n\\nNow, we get the copy and we\'re good to go.\\n\\n## Na\xefve solution\\n\\nAs you may know, C++ offers a plethora of functions that can be used to your\\nadvantage, given that you know how to \u201cbend\u201d the data structures accordingly.\\n\\nWhat does that mean for us? Well, we have an `std::sort`, we can use it, right?\\nLet\'s have a look at it:\\n\\n```cpp\\ntemplate< class RandomIt >\\nvoid sort( RandomIt first, RandomIt last );\\n```\\n\\nThis overload is more than we need. What does it do? It just sorts the elements\\nin the range `[first, last)` using `operator<` on them. We can\'t sort the whole\\nmatrix using this, but\u2026 we can sort just \xbbone\xab diagonal without doing much work\\non our end.\\n\\nWhat is the `RandomIt` type though? If we look more into the documentation, we\\ncan easily find the requirements for it and also learn that it\'s a _random access_\\n_iterator_ and allows swapping its values at the same time.\\n\\n:::tip Random access iterator\\n\\nWhat is the _random access iterator_ though? We can find it in a documentation\\nand see the following description:\\n\\n> A **LegacyRandomAccessIterator** is a [LegacyBidirectionalIterator](https://en.cppreference.com/w/cpp/named_req/BidirectionalIterator)\\n> that can be moved to point to any element in constant time.\\n\\nAfter that we can see all the requirements for it being listed. I don\'t feel like\\nreading them right now, so we will just use it and see where the compilation blows\\nup, i.e. \u201c_compiler-assisted development_\u201d[^2] if you will ;)\\n\\n:::\\n\\nNow we know that we can use `std::sort` to sort the diagonal itself, but we also\\nneed to get the diagonals somehow. I\'m rather lazy, so I\'ll just delegate it to\\nsomeone else[^3]. And that way we get\\n\\n```cpp\\nmatrix diagonalSort(matrix mat)\\n{\\n // we iterate over the diagonals\\n for (auto d : diagonals(mat)) {\\n // and we sort each diagonal\\n std::sort(d.begin(), d.end());\\n }\\n\\n // we take the matrix by copy, so we can sort in-situ and return the copy\\n // that we sorted\\n return mat;\\n}\\n```\\n\\nThis solution looks very simple, doesn\'t it? Well, cause it is.\\nLet\'s try compiling it:\\n\\n```\\nmatrix-sort.cpp:11:23: error: use of undeclared identifier \'diagonals\' [clang-diagnostic-error]\\n for (auto d : diagonals(mat)) {\\n ^\\nFound compiler error(s).\\nmake: *** [makefile:14: tidy] Error 1\\n```\\n\\nOK, seems about right. We haven\'t implemented the `diagonals` yet. And based on\\nwhat we\'ve written so far, we need a function or a class `diagonals` that will\\ngive us the diagonals we need.\\n\\n## Implementing the `diagonals`\\n\\nCool, so we need the function that will let us go through each and every diagonal\\nin our matrix. We use the _for-range_ loop, so whatever we get back from the\\n`diagonals` must support `.begin()` and `.end()`. Since I am a masochist, we will\\ndo such functionality for a matrix of any type, not just the `int` from the challenge.\\n\\nAs I said, we need to be able to\\n\\n- construct the object\\n- get the beginning\\n- get the end (the \u201csentinel\u201d)\\n\\n```cpp\\ntemplate <typename T>\\nclass diagonals {\\n using matrix_t = std::vector<std::vector<T>>;\\n\\n matrix_t& _matrix;\\n\\npublic:\\n diagonals(matrix_t& m)\\n : _matrix(m)\\n {\\n }\\n diagonals_iter begin()\\n {\\n /* TODO */\\n }\\n diagonals_iter end()\\n {\\n /* TODO */\\n }\\n};\\n```\\n\\nNow we have a `diagonals` that we can use to go through the diagonals. We haven\'t\\nimplemented the core of it yet. Let\'s go through what we have for now.\\n\\nWe have a templated class with templated `T` that is used as a placeholder for any\\ntype we would store in the matrix. Because I\'m lazy, I have defined the `matrix_t`\\ntype that is a \u201cshortcut\u201d for `std::vector<std::vector<T>>`, so I don\'t have to\\ntype it out all the time. Of course, we need to store the matrix, we are given,\\nas a private attribute. And then just have the constructor and the 2 methods we\\nneed for the _for-range_.\\n\\n### Iterating over diagonals\\n\\nNow that we have an object that will allow us to iterate through the diagonals,\\nwe need to implement the iterating itself. We need to go through all of them, so\\nwe have multiple options how to do so. I have decided to start from the \u201cmain\u201d\\ndiagonal that starts at `(0, 0)` index and then proceed with the diagonals starting\\nin the first row, followed by the rest of the diagonals in the first column.\\n\\nWe need to be able to tell that we\'ve iterated through all of them, and also we\\nneed to know which diagonal is next. For that purpose we will pass the indices\\nof the first cell on the diagonal. That way we can always tell how to move forward.\\n\\nWe will start by updating the `begin` and `end` to reflect our choice accordingly.\\n\\n```cpp\\ndiagonals_iter begin() { return diagonals_iter { _matrix, 0, 0 }; }\\ndiagonals_iter end() { return diagonals_iter { _matrix, 0, _matrix.size() }; }\\n```\\n\\nFor the `begin` we return the first diagonal that starts at `(0, 0)`. And because\\nwe have decided to do the diagonals in the first column at the end, the first\\ndiagonal that is not a valid one is the one at `(0, height)`. Apart from the\\nindices, we also need to pass reference to the matrix itself.\\n\\n:::note\\n\\nYou may have noticed that we also include the diagonals that have length 1,\\nspecifically the ones at `(0, height - 1)` and `(width - 1, 0)`. We are implementing\\nan iterator that **should not** care about the way it\'s being used. Therefore, we\\ndon\'t care about the fact they don\'t need to be sorted.\\n\\n:::\\n\\nCool, let\'s leave the iterator itself to someone else, right?[^4]\\n\\n### Implementing the iterator over diagonals\\n\\nWe can start with a simple skeleton based on the information that we pass from\\nthe `diagonals`. Also to utilize the `matrix_t` and also contain implementation\\ndetails hidden away, we will put this code into the `diagonals` class.\\n\\n```cpp\\nclass diagonals_iter {\\n matrix_t& m;\\n std::size_t x;\\n std::size_t y;\\n\\npublic:\\n diagonals_iter(matrix_t& matrix, std::size_t x, std::size_t y)\\n : m(matrix)\\n , x(x)\\n , y(y)\\n {\\n }\\n};\\n```\\n\\nIn this case we will be implementing a \u201csimple\u201d forward iterator, so we don\'t\\nneed to implement a lot. Notably it will be:\\n\\n- inequality operator (we need to know when we reach the end and have nothing to\\n iterate over)\\n- preincrementation operator (we need to be able to move around the iterable)\\n- dereference operator (we need to be able to retrieve the objects we iterate\\n over)\\n\\n```cpp\\nclass diagonals_iter {\\n matrix_t& m;\\n std::size_t x;\\n std::size_t y;\\n\\npublic:\\n diagonals_iter(matrix_t& matrix, std::size_t x, std::size_t y)\\n : m(matrix)\\n , x(x)\\n , y(y)\\n {\\n }\\n\\n bool operator!=(const diagonals_iter& rhs) const\\n {\\n // iterators are not equal if they reference different matrices, or\\n // their positions differ\\n return m != rhs.m || x != rhs.x || y != rhs.y;\\n }\\n\\n diagonals_iter& operator++()\\n {\\n if (y != 0) {\\n // iterating through diagonals down the first column\\n y++;\\n return *this;\\n }\\n\\n // iterating the diagonals along the first row\\n x++;\\n if (x == m.front().size()) {\\n // switching to diagonals in the first column\\n x = 0;\\n y++;\\n }\\n\\n return *this;\\n }\\n\\n diagonal<T> operator*() const { return diagonal { m, x, y }; }\\n};\\n```\\n\\nLet\'s go one-by-one. Inequality operator is rather simple, just compare iterator\'s\\nattributes field-by-field. If you think about it, checking inequality of two 2D\\nvectors may be a bit inefficient, therefore, we can swap around and check it as\\na last thing.\\n\\n```diff\\n- return m != rhs.m || x != rhs.x || y != rhs.y;\\n+ return x != rhs.x || y != rhs.y || m != rhs.m;\\n```\\n\\nPreincrementation is where the magic happens. If you have a better look, you can\\nsee two branches of this operation:\\n\\n1. When `y != 0` (we\'re iterating over the diagonals in the first column)\\n In this case, we just bump the row and we\'re done.\\n2. When `y == 0` (we\'re iterating over the diagonals in the first row)\\n In this case, we bump the column and check if we haven\'t gotten out of bounds,\\n i.e. the end of the first row. If we get out of the bounds, we\'re continuing\\n with the second diagonal in the first column.\\n\\nDereferencing the iterator must \u201cyield\u201d something. In our case it will be the\\ndiagonal that we want to sort. For sorting we need just the iterators that can\\nmove around said diagonal. The simplest thing, we can do, is to delegate it to\\nsomething else. In our case it will be a class called `diagonal`.\\n\\n## Implementing the `diagonal` itself\\n\\nAfter implementing the iterator over diagonals, we know that all we need to describe\\na diagonal is the matrix itself and the \u201cstart\u201d of the diagonal (row and column).\\nAnd we also know that the diagonal must provide some iterators for the `std::sort`\\nfunction. We can start with the following skeleton:\\n\\n```cpp\\ntemplate <typename T>\\nclass diagonal {\\n using matrix_t = std::vector<std::vector<T>>;\\n\\n matrix_t& matrix;\\n std::size_t x;\\n std::size_t y;\\n\\npublic:\\n diagonal(matrix_t& matrix, std::size_t x, std::size_t y)\\n : matrix(matrix)\\n , x(x)\\n , y(y)\\n {\\n }\\n\\n diagonal_iter begin() const { return diagonal_iter { matrix, x, y }; }\\n\\n diagonal_iter end() const\\n {\\n auto max_x = matrix[y].size();\\n auto max_y = matrix.size();\\n\\n // we need to find the distance in which we get out of bounds (either in\\n // column or row)\\n auto steps = std::min(max_x - x, max_y - y);\\n\\n return diagonal_iter { matrix, x + steps, y + steps };\\n }\\n};\\n```\\n\\nInitialization is rather simple, we just \u201ckeep\u201d the stuff we get, `begin` is the\\nsimplest, we just delegate.\\n\\nIn case of the `end`, it gets more complicated. We need to know where is the \u201cend\u201d\\nof the diagonal. Since `end` should point to the first element \u201cafter\u201d the iterable,\\nwe know that it\'s the first position of the iterator where either `y` becomes\\n`matrix.size()` or `x` becomes `matrix[y].size()`. Also we are moving along diagonal,\\nduh, therefore we can deduce the first \u201cposition\u201d afterwards by minimal amount of\\nsteps to get out of the any column or row, hence `std::min(max_x - x, max_y - y)`.\\nFinal position is then computed simply by adding the steps to the beginning of\\nthe diagonal.\\n\\nNow we just need to finish the iterator for the diagonal itself and we\'re done.\\n\\n### Implementing `diagonal_iter`\\n\\nThis part is the hardest from all we need to do. It\'s because of the requirements\\nof the `std::sort` that requires us to implement a _random access iterator_. I have\\nbriefly described it above, and \u201cin a nutshell\u201d it means that we need to implement\\nan iterator that can move in constant time along the diagonal in any amount of\\nsteps.\\n\\nLet\'s go through all of the functionality that our iterator needs to support to\\nbe used in `std::sort`. We need the usual operations like:\\n\\n- equality/inequality\\n- incrementation\\n- dereferencing\\n\\nWe will also add all the types that our iterator uses with the category of the\\niterator, i.e. what interface it supports:\\n\\n```cpp\\nclass diagonal_iter {\\n // we need to keep reference to the matrix itself\\n matrix_t& m;\\n\\n // we need to be able to tell our current position\\n std::size_t x;\\n std::size_t y;\\n\\npublic:\\n using difference_type = std::ptrdiff_t;\\n using value_type = T;\\n using pointer = T*;\\n using reference = T&;\\n using iterator_category = std::random_access_iterator_tag;\\n\\n diagonal_iter(matrix_t& matrix,\\n std::size_t x,\\n std::size_t y)\\n : m(matrix)\\n , x(x)\\n , y(y)\\n {\\n }\\n\\n bool operator==(const diagonal_iter& rhs) const\\n {\\n return x == rhs.x && y == rhs.y && m == rhs.m;\\n }\\n\\n diagonal_iter& operator++()\\n {\\n // we are moving along the diagonal, so we increment both \u2039x\u203a and \u2039y\u203a at\\n // the same time\\n x++;\\n y++;\\n return *this;\\n }\\n\\n reference operator*() const { return m[y][x]; }\\n};\\n```\\n\\nThis is pretty similar to the previous iterator, but now we need to implement the\\nremaining requirements of the _random access iterator_. Let\'s see what those are:\\n\\n- decrementation - cause we need to be able to move backwards too, since _random _\\n _access iterator_ extends the interface of _bidirectional iterator_\\n- moving the iterator in either direction by steps given as an integer\\n- being able to tell the distance between two iterators\\n- define an ordering on the iterators\\n\\nLet\'s fill them in:\\n\\n```cpp\\nclass diagonal_iter {\\n // we need to keep reference to the matrix itself\\n matrix_t& m;\\n\\n // we need to be able to tell our current position\\n std::size_t x;\\n std::size_t y;\\n\\npublic:\\n using difference_type = std::ptrdiff_t;\\n using value_type = T;\\n using pointer = T*;\\n using reference = T&;\\n using iterator_category = std::random_access_iterator_tag;\\n\\n diagonal_iter(matrix_t& matrix,\\n std::size_t x,\\n std::size_t y)\\n : m(matrix)\\n , x(x)\\n , y(y)\\n {\\n }\\n\\n bool operator==(const diagonal_iter& rhs) const\\n {\\n return x == rhs.x && y == rhs.y && m == rhs.m;\\n }\\n\\n diagonal_iter& operator++()\\n {\\n // we are moving along the diagonal, so we increment both \u2039x\u203a and \u2039y\u203a at\\n // the same time\\n x++;\\n y++;\\n return *this;\\n }\\n\\n reference operator*() const { return m[y][x]; }\\n\\n // exactly opposite to the incrementation\\n diagonal_iter operator--()\\n {\\n x--;\\n y--;\\n return *this;\\n }\\n\\n // moving \u2039n\u203a steps back is same as calling decrementation \u2039n\u203a-times, so we\\n // can just return a new iterator and subtract \u2039n\u203a from both coordinates in\\n // the matrix\\n diagonal_iter operator-(difference_type n) const\\n {\\n return diagonal_iter { m, x - n, y - n };\\n }\\n\\n // here we assume that we are given two iterators on the same diagonal\\n difference_type operator-(const diagonal_iter& rhs) const\\n {\\n assert(m == rhs.m);\\n return x - rhs.x;\\n }\\n\\n // counterpart of moving \u2039n\u203a steps backwards\\n diagonal_iter operator+(difference_type n) const\\n {\\n return diagonal_iter { m, x + n, y + n };\\n }\\n\\n // we compare the coordinates, and also assume that those 2 iterators are\\n // lying on the same diagonal\\n bool operator<(const diagonal_iter& rhs) const\\n {\\n assert(m == rhs.m);\\n return x < rhs.x && y < rhs.y;\\n }\\n};\\n```\\n\\nAt this point we could probably try and compile it, right? If we do so, we will\\nget yelled at by a compiler for the following reasons:\\n\\n```\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1792:11: error: object of type \'diagonal<int>::diagonal_iter\' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]\\n __last = __next;\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1817:11: note: in instantiation of function template specialization \'std::__unguarded_linear_insert<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Val_less_iter>\' requested here\\n std::__unguarded_linear_insert(__i,\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1849:9: note: in instantiation of function template specialization \'std::__insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__insertion_sort(__first, __first + int(_S_threshold), __comp);\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1940:9: note: in instantiation of function template specialization \'std::__final_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__final_insertion_sort(__first, __last, __comp);\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization \'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());\\n ^\\nmatrix-sort.cpp:161:18: note: in instantiation of function template specialization \'std::sort<diagonal<int>::diagonal_iter>\' requested here\\n std::sort(d.begin(), d.end());\\n ^\\nmatrix-sort.cpp:17:19: note: copy assignment operator of \'diagonal_iter\' is implicitly deleted because field \'m\' is of reference type \'diagonal<int>::matrix_t &\' (aka \'vector<std::vector<int>> &\')\\n matrix_t& m;\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1830:2: error: no matching function for call to \'__unguarded_linear_insert\' [clang-diagnostic-error]\\n std::__unguarded_linear_insert(__i,\\n ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1850:9: note: in instantiation of function template specialization \'std::__unguarded_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__unguarded_insertion_sort(__first + int(_S_threshold), __last,\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1940:9: note: in instantiation of function template specialization \'std::__final_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__final_insertion_sort(__first, __last, __comp);\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization \'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());\\n ^\\nmatrix-sort.cpp:161:18: note: in instantiation of function template specialization \'std::sort<diagonal<int>::diagonal_iter>\' requested here\\n std::sort(d.begin(), d.end());\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1782:5: note: candidate template ignored: substitution failure [with _RandomAccessIterator = diagonal<int>::diagonal_iter, _Compare = __gnu_cxx::__ops::_Val_less_iter]\\n __unguarded_linear_insert(_RandomAccessIterator __last,\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1923:11: error: object of type \'diagonal<int>::diagonal_iter\' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]\\n __last = __cut;\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1937:9: note: in instantiation of function template specialization \'std::__introsort_loop<diagonal<int>::diagonal_iter, long, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__introsort_loop(__first, __last,\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization \'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());\\n ^\\nmatrix-sort.cpp:161:18: note: in instantiation of function template specialization \'std::sort<diagonal<int>::diagonal_iter>\' requested here\\n std::sort(d.begin(), d.end());\\n ^\\nmatrix-sort.cpp:17:19: note: copy assignment operator of \'diagonal_iter\' is implicitly deleted because field \'m\' is of reference type \'diagonal<int>::matrix_t &\' (aka \'vector<std::vector<int>> &\')\\n matrix_t& m;\\n ^\\n```\\n\\nThat\'s a lot of noise, isn\'t it? Let\'s focus on the important parts:\\n\\n```\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1792:11: error: object of type \'diagonal<int>::diagonal_iter\' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]\\n\u2026\\nmatrix-sort.cpp:17:19: note: copy assignment operator of \'diagonal_iter\' is implicitly deleted because field \'m\' is of reference type \'diagonal<int>::matrix_t &\' (aka \'vector<std::vector<int>> &\')\\n matrix_t& m;\\n ^\\n```\\n\\nAh! We have a reference in our iterator, and this prevents us from having a copy\\nassignment operator (that is used \u201csomewhere\u201d in the sorting algorithm). Well\u2026\\nLet\'s just wrap it!\\n\\n```diff\\n# we need to keep a different type than reference\\n- matrix_t& m;\\n+ std::reference_wrapper<matrix_t> m;\\n\\n# in comparison we need to get the reference out of the wrapper first\\n- return x == rhs.x && y == rhs.y && m == rhs.m;\\n+ return x == rhs.x && y == rhs.y && m.get() == rhs.m.get();\\n\\n# same when we return a reference to the \u201ccell\u201d in the matrix\\n- reference operator*() const { return m[y][x]; }\\n+ reference operator*() const { return m.get()[y][x]; }\\n\\n# and finally in the assertions that we set for the \u201cdistance\u201d and \u201cless than\u201d\\n- assert(m == rhs.m);\\n+ assert(m.get() == rhs.m.get());\\n```\\n\\nWe\'re done now! We have written an iterator over diagonals for a 2D `vector`. You can have a look at the final result [here](pathname:///files/blog/leetcode/sort-matrix-diagonally/matrix-sort.cpp).\\n\\n[^1]: just because I\'m used to it and don\'t care about your opinion ;)\\n[^2]: exercise at your own risk\\n[^3]: me in 5 minutes in fact, but don\'t make me scared\\n[^4]: me in the next section\u2026"},{"id":"aoc-2022/2nd-week","metadata":{"permalink":"/blog/aoc-2022/2nd-week","editUrl":"https://github.com/mfocko/blog/tree/main/blog/aoc-2022/02-week-2.md","source":"@site/blog/aoc-2022/02-week-2.md","title":"2nd week of Advent of Code \'22 in Rust","description":"Surviving second week in Rust.","date":"2022-12-25T23:15:00.000Z","formattedDate":"December 25, 2022","tags":[{"label":"advent-of-code","permalink":"/blog/tags/advent-of-code"},{"label":"advent-of-code-2022","permalink":"/blog/tags/advent-of-code-2022"},{"label":"rust","permalink":"/blog/tags/rust"}],"readingTime":20.875,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"2nd week of Advent of Code \'22 in Rust","description":"Surviving second week in Rust.","date":"2022-12-25T23:15","slug":"aoc-2022/2nd-week","authors":"mf","tags":["advent-of-code","advent-of-code-2022","rust"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"Sort the matrix diagonally","permalink":"/blog/leetcode/sort-diagonally"},"nextItem":{"title":"1st week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/1st-week"}},"content":"Let\'s go through the second week of [_Advent of Code_] in Rust.\\n\\n\x3c!--truncate--\x3e\\n\\n## [Day 8: Treetop Tree House](https://adventofcode.com/2022/day/8)\\n\\n:::info tl;dr\\n\\nWe get a forest and we want to know how many trees are visible from the outside.\\nApart from that we want to find the best view.\\n\\n:::\\n\\nNothing interesting. We are moving around 2D map though. And indexing can get a\\nbit painful when doing so, let\'s refactor it a bit ;) During the preparation for\\nthe AoC, I have written `Vector2D` and now it\'s time to extend it with indexing\\nof `Vec` of `Vec`s. In my solution I was manipulating with indices in the following\\nway:\\n\\n- swapping them\\n- checking whether they are correct indices for the `Vec<Vec<T>>`\\n- indexing `Vec<Vec<T>>` with them\\n\\n:::caution\\n\\nI\'m getting familiar with Rust and starting to \u201cabuse\u201d it\u2026 While doing so, I\'m\\nalso uncovering some \u201cfeatures\u201d that I don\'t really like. Therefore I will mark\\nall of my rants with _thicc_ **\xab\u21af\xbb** mark and will try to \u201clock\u201d them into their\\nown \u201cbox of hell\u201d.\\n\\n:::\\n\\n#### Swapping indices\\n\\nRelatively simple implementation, just take the values, swap them and return new\\nvector.\\n\\n```rust\\nimpl<T: Copy> Vector2D<T> {\\n pub fn swap(&self) -> Self {\\n Self {\\n x: self.y,\\n y: self.x,\\n }\\n }\\n}\\n```\\n\\nPretty straight-forward implementation, but let\'s talk about the `T: Copy`. We\\nneed to use it, since we are returning a **new** vector, with swapped **values**.\\nIf we had values that cannot be copied, the only thing we could do, would be a\\nvector of references (and it would also introduce a lifetime, to which we\'ll get\\nlater on). This is pretty similar with the operations on sets from the first week.\\n\\n#### Indexing `Vec`\\n\\nI will start with the indexing, cause bound-checking is a bit more\u2026 complicated\\nthan I would like to.\\n\\n```rust\\npub fn index<\'a, T, U>(v: &\'a [Vec<U>], idx: &Vector2D<T>) -> &\'a U\\nwhere\\n usize: TryFrom<T>,\\n <usize as TryFrom<T>>::Error: Debug,\\n T: Copy,\\n{\\n let (x, y): (usize, usize) = (idx.x.try_into().unwrap(), idx.y.try_into().unwrap());\\n &v[y][x]\\n}\\n```\\n\\nLet\'s talk about this mess\u2026 Body of the function is probably the most easy part\\nand should not be hard to understand, we just take the `x` and `y` and convert\\nthem both to `usize` type that can be used later on for indexing.\\n\\nThe type signature of the function is where the fun is at :wink: We are trying\\nto convert unknown type to `usize`, so we must bound the `T` as a type that can\\nbe converted to `usize`, that\'s how we got `usize: TryFrom<T>` which basically\\nsays that `usize` must implement `TryFrom<T>` trait and therefore allows us to\\nconvert the indices to actual `usize` indices. Using `.unwrap()` also forces us\\nto bound the error that can occur when converting `T` into `usize`, that\'s how\\nwe get `<usize as TryFrom<T>>::Error: Debug` which loosely means\\n\\n> error during conversion of `T` into `usize` must implement `Debug`,\\n> i.e. can be printed in some way or other\\n\\n`T: Copy` is required by `.try_into()` which takes `T` by-value.\\n\\nAnd now we are left only with the first line of the definition.\\n\\n:::note\\n\\nSkilled Rustaceans might notice that this implementation is rather flaky and can\\nbreak in multiple places at once. I\'ll get back to it\u2026\\n\\n:::\\n\\nLet\'s split it in multiple parts:\\n\\n- `v: &\'a [Vec<U>]` represents the 2D `Vec`, we are indexing, `Vec` implements\\n `Slice` trait and _clippy_ recommends using `&[T]` to `&Vec<T>`, exact details\\n are unknown to me\\n- `idx: &Vector2D<T>` represents the _indices_ which we use, we take them by\\n reference to avoid an unnecessary copy\\n- `-> &\'a U` means that we are returning a _reference_ to some value of type `U`.\\n Now the question is what does the `\'a` mean, we can also see it as a generic\\n type declared along `T` and `U`. And the answer is _relatively_ simple, `\'a`\\n represents a _lifetime_. We take the `v` by a reference and return a reference,\\n borrow checker validates all of the _borrows_ (or references), so we need to\\n specify that our returned value has _the same lifetime_ as the vector we have\\n taken by a reference, i.e. returned reference must live at least as long as the\\n `v`. This way we can \u201cbe sure\u201d that the returned reference is valid.\\n\\n##### Issues\\n\\nFirst issue that our implementation has is the fact that we cannot get a mutable\\nreference out of that function. This could be easily resolved by introducing new\\nfunction, e.g. `index_mut`. Which I have actually done while writing this part:\\n\\n```rust\\npub fn index_mut<\'a, T, U>(v: &\'a mut [Vec<U>], idx: &Vector2D<T>) -> &\'a mut U\\nwhere\\n usize: TryFrom<T>,\\n <usize as TryFrom<T>>::Error: Debug,\\n T: Copy,\\n{\\n let (x, y): (usize, usize) = (idx.x.try_into().unwrap(), idx.y.try_into().unwrap());\\n &mut v[y][x]\\n}\\n```\\n\\n:::caution **\xab\u21af\xbb** Why can\'t we use one function?\\n\\nWhen we consider a `Vec<T>`, we don\'t need to consider containers as `T`, Rust\\nimplements indexing as traits `Index<T>` and `IndexMut<T>` that do the dirty work\\nbehind syntactic sugar of `container[idx]`.\\n\\nHowever, implementing of traits is not allowed for _external_ types, i.e. types\\nthat you haven\'t defined yourself. This means that you can implement indexing\\nover containers that you have implemented yourself, but you cannot use your own\\ntypes for indexing \u201cbuilt-in\u201d types.\\n\\nAnother part of this rabbit hole is trait `SliceIndex<T>` that is of a relevance\\nbecause of\\n\\n```rust\\nimpl<T, I> Index<I> for [T]\\nwhere\\n I: SliceIndex<[T]>\\n\\nimpl<T, I, A> Index<I> for Vec<T, A>\\nwhere\\n I: SliceIndex<[T]>,\\n A: Allocator\\n\\nimpl<T, I, const N: usize> Index<I> for [T; N]\\nwhere\\n [T]: Index<I>\\n```\\n\\nIn other words, if your type implements `SliceIndex<T>` trait, it can be used\\nfor indexing. As of now, this trait has all of its required methods experimental\\nand is marked as `unsafe`.\\n\\n:::\\n\\nAnother problem is a requirement for indexing either `[Vec<T>]` or `Vec<Vec<T>>`.\\nThis requirement could be countered by removing inner type `Vec<T>` and constraining\\nit by a trait `Index` (or `IndexMut` respectively) in a following way\\n\\n```rust\\npub fn index<\'a, C, T>(v: &\'a [C], idx: &Vector2D<T>) -> &\'a C::Output\\nwhere\\n usize: TryFrom<T>,\\n <usize as TryFrom<T>>::Error: Debug,\\n T: Copy,\\n C: Index<usize>\\n{\\n let (x, y): (usize, usize) = (idx.x.try_into().unwrap(), idx.y.try_into().unwrap());\\n &v[y][x]\\n}\\n```\\n\\nGiven this, we can also give a more meaningful typename for indexing type, such\\nas `I`.\\n\\n#### Checking bounds\\n\\nNow we can get to the boundary checks, it is very similar, but a more\u2026 dirty.\\nFirst approach that came up was to convert the indices in `Vector2D` to `usize`,\\nbut when you add the indices up, e.g. when checking the neighbors, you can end\\nup with negative values which, unlike in C++, causes an error (instead of underflow\\nthat you can use to your advantage; you can easily guess how).\\n\\nSo how can we approach this then? Well\u2026 we will convert the bounds instead of\\nthe indices and that lead us to:\\n\\n```rust\\npub fn in_range<T, U>(v: &[Vec<U>], idx: &Vector2D<T>) -> bool\\nwhere\\n usize: TryInto<T>,\\n <usize as TryInto<T>>::Error: Debug,\\n T: PartialOrd + Copy,\\n{\\n idx.y >= 0.try_into().unwrap()\\n && idx.y < v.len().try_into().unwrap()\\n && idx.x >= 0.try_into().unwrap()\\n && idx.x\\n < v[TryInto::<usize>::try_into(idx.y).unwrap()]\\n .len()\\n .try_into()\\n .unwrap()\\n}\\n```\\n\\nYou can tell that it\'s definitely a shitty code. Let\'s improve it now! We will\\nget back to the original idea, but do it better. We know that we cannot convert\\nnegative values into `usize`, **but** we also know that conversion like that\\nreturns a `Result<T, E>` which we can use to our advantage.\\n\\n```rust\\npub fn in_range<T, U>(v: &[Vec<U>], idx: &Vector2D<T>) -> bool\\nwhere\\n T: Copy,\\n usize: TryFrom<T>,\\n{\\n usize::try_from(idx.y)\\n .and_then(|y| usize::try_from(idx.x).map(|x| y < v.len() && x < v[y].len()))\\n .unwrap_or(false)\\n}\\n```\\n\\n`Result<T, E>` is a type similar to `Either` in Haskell and it allows us to chain\\nmultiple operations on correct results or propagate the original error without\\ndoing anything. Let\'s dissect it one-by-one.\\n\\n`try_from` is a method implemented in `TryFrom` trait, that allows you to convert\\ntypes and either successfully convert them or fail (with a reasonable error). This\\nmethod returns `Result<T, E>`.\\n\\nWe call `and_then` on that _result_, let\'s have a look at the type signature of\\n`and_then`, IMO it explains more than enough:\\n\\n```rust\\npub fn and_then<U, F>(self, op: F) -> Result<U, E>\\nwhere\\n F: FnOnce(T) -> Result<U, E>\\n```\\n\\nOK\u2026 So it takes the result and a function and returns another result with\\ndifferent value and different error. However we can see that the function, which\\nrepresents an operation on a result, takes just the value, i.e. it doesn\'t care\\nabout any previous error. To make it short:\\n\\n> `and_then` allows us to run an operation, which can fail, on the correct result\\n\\nWe parsed a `y` index and now we try to convert the `x` index with `try_from`\\nagain, but on that result we use `map` rather than `and_then`, why would that be?\\n\\n```rust\\npub fn map<U, F>(self, op: F) -> Result<U, E>\\nwhere\\n F: FnOnce(T) -> U\\n```\\n\\nHuh\u2026 `map` performs an operation that **cannot** fail. And finally we use\\n`unwrap_or` which takes the value from result, or in case of an error returns the\\ndefault that we define.\\n\\nHow does this work then? If `y` is negative, the conversion fails and the error\\npropagates all the way to `unwrap_or`, if `y` can be a correct `usize` value, then\\nwe do the same with `x`. If `x` is negative, we propagate the error as with `y`,\\nand if it\'s not, then we check whether it exceeds the higher bounds or not.\\n\\n### Solution\\n\\nRelatively simple, you just need follow the rules and not get too smart, otherwise\\nit will get back at you.\\n\\n## [Day 9: Rope Bridge](https://adventofcode.com/2022/day/9)\\n\\n:::info tl;dr\\n\\nWe get a rope with knots and we want to track how many different positions are\\nvisited with the rope\'s tail.\\n\\n:::\\n\\nBy this day, I have come to a conclusion that current skeleton for each day\\ngenerates a lot of boilerplate. And even though it can be easily copied, it\'s\\njust a waste of space and unnecessary code. Let\'s \u201csimplify\u201d this (on one end\\nwhile creating monster on the other end). I\'ve gone through what we need in the\\npreparations for the AoC. Let\'s sum up our requirements:\\n\\n- parsing\\n- part 1 & 2\\n- running on sample / input\\n- tests\\n\\nParsing and implementation of both parts is code that changes each day and we\\ncannot do anything about it. However running and testing can be simplified!\\n\\nLet\'s introduce and export a new module `solution` that will take care of all of\\nthis. We will start by introducing a trait for each day.\\n\\n```rust\\npub trait Solution<Input, Output: Display> {\\n fn parse_input<P: AsRef<Path>>(pathname: P) -> Input;\\n\\n fn part_1(input: &Input) -> Output;\\n fn part_2(input: &Input) -> Output;\\n}\\n```\\n\\nThis does a lot of work for us already, we have defined a trait and for each day\\nwe will create a structure representing a specific day. That structure will also\\nimplement the `Solution` trait.\\n\\nNow we need to get rid of the boilerplate, we can\'t get rid of the `main` function,\\nbut we can at least move out the functionality.\\n\\n```rust\\nfn run(type_of_input: &str) -> Result<()>\\nwhere\\n Self: Sized,\\n{\\n tracing_subscriber::fmt()\\n .with_env_filter(EnvFilter::from_default_env())\\n .with_target(false)\\n .with_file(true)\\n .with_line_number(true)\\n .without_time()\\n .compact()\\n .init();\\n color_eyre::install()?;\\n\\n let input = Self::parse_input(format!(\\"{}s/{}.txt\\", type_of_input, Self::day()));\\n\\n info!(\\"Part 1: {}\\", Self::part_1(&input));\\n info!(\\"Part 2: {}\\", Self::part_2(&input));\\n\\n Ok(())\\n}\\n\\nfn main() -> Result<()>\\nwhere\\n Self: Sized,\\n{\\n Self::run(\\"input\\")\\n}\\n```\\n\\nThis is all part of the `Solution` trait, which can implement methods while being\\ndependent on what is provided by the implementing types. In this case, we just\\nneed to bound the `Output` type to implement `Display` that is necessary for the\\n`info!` and format string there.\\n\\nNow we can get to first of the nasty things we are going to do\u2026 And it is the\\n`day()` method that you can see being used when constructing path to the input\\nfile. That method will generate a name of the file, e.g. `day01` and we know that\\nwe can _somehow_ deduce it from the structure name, given we name it reasonably.\\n\\n```rust\\nfn day() -> String {\\n let mut day = String::from(type_name::<Self>().split(\\"::\\").next().unwrap());\\n day.make_ascii_lowercase();\\n\\n day.to_string()\\n}\\n```\\n\\n:::caution `type_name`\\n\\nThis feature is still experimental and considered to be internal, it is not\\nadvised to use it any production code.\\n\\n:::\\n\\nAnd now we can get to the nastiest stuff :weary: We will **generate** the tests!\\n\\nWe want to be able to generate tests for sample input in a following way:\\n\\n```rust\\ntest_sample!(day_01, Day01, 42, 69);\\n```\\n\\nThere\'s not much we can do, so we will write a macro to generate the tests for us.\\n\\n```rust\\n#[macro_export]\\nmacro_rules! test_sample {\\n ($mod_name:ident, $day_struct:tt, $part_1:expr, $part_2:expr) => {\\n #[cfg(test)]\\n mod $mod_name {\\n use super::*;\\n\\n #[test]\\n fn test_part_1() {\\n let sample =\\n $day_struct::parse_input(&format!(\\"samples/{}.txt\\", $day_struct::day()));\\n assert_eq!($day_struct::part_1(&sample), $part_1);\\n }\\n\\n #[test]\\n fn test_part_2() {\\n let sample =\\n $day_struct::parse_input(&format!(\\"samples/{}.txt\\", $day_struct::day()));\\n assert_eq!($day_struct::part_2(&sample), $part_2);\\n }\\n }\\n };\\n}\\n```\\n\\nWe have used it in a similar way as macros in C/C++, one of the things that we\\ncan use to our advantage is defining \u201ctype\u201d of the parameters for the macro. All\\nparameters have their name prefixed with `$` sign and you can define various \u201cforms\u201d\\nof your macro. Let\'s go through it!\\n\\nWe have following parameters:\\n\\n- `$mod_name` which represents the name for the module with tests, it is typed\\n with `ident` which means that we want a valid identifier to be passed in.\\n- `$day_struct` represents the structure that will be used for tests, it is typed\\n with `tt` which represents a _token tree_, in our case it is a type.\\n- `$part_X` represents the expected output for the `X`th part and is of type `expr`\\n which literally means an _expression_.\\n\\nApart from that we need to use `#[macro_export]` to mark the macro as exported\\nfor usage outside of the module. Now our skeleton looks like:\\n\\n```rust\\nuse aoc_2022::*;\\n\\ntype Input = String;\\ntype Output = String;\\n\\nstruct DayXX;\\nimpl Solution<Input, Output> for DayXX {\\n fn parse_input<P: AsRef<Path>>(pathname: P) -> Input {\\n file_to_string(pathname)\\n }\\n\\n fn part_1(input: &Input) -> Output {\\n todo!()\\n }\\n\\n fn part_2(input: &Input) -> Output {\\n todo!()\\n }\\n}\\n\\nfn main() -> Result<()> {\\n // DayXX::run(\\"sample\\")\\n DayXX::main()\\n}\\n\\n// test_sample!(day_XX, DayXX, , );\\n```\\n\\n### Solution\\n\\nNot much to talk about, it is relatively easy to simulate.\\n\\n## [Day 10: Cathode-Ray Tube](https://adventofcode.com/2022/day/10)\\n\\n:::info tl;dr\\n\\nEmulating basic arithmetic operations on a CPU and drawing on CRT based on the\\nCPU\'s accumulator.\\n\\n:::\\n\\nIn this day I have discovered an issue with my design of the `Solution` trait.\\nAnd the issue is caused by different types of `Output` for the part 1 and part 2.\\n\\nProblem is relatively simple and consists of simulating a CPU, I have approached\\nit in a following way:\\n\\n```rust\\nfn evaluate_instructions(instructions: &[Instruction], mut out: Output) -> Output {\\n instructions\\n .iter()\\n .fold(State::new(), |state, instruction| {\\n state.execute(instruction, &mut out)\\n });\\n\\n out\\n}\\n```\\n\\nWe just take the instructions, we have some state of the CPU and we execute the\\ninstructions one-by-one. Perfect usage of the `fold` (or `reduce` as you may know\\nit from other languages).\\n\\nYou can also see that we have an `Output` type, so the question is how can we fix\\nthat problem. And the answer is very simple and _functional_. Rust allows you to\\nhave an `enumeration` that can _bear_ some other values apart from the type itself.\\n\\n:::tip\\n\\nWe could\'ve seen something like this with the `Result<T, E>` type that can be\\ndefined as\\n\\n```rust\\nenum Result<T, E> {\\n Ok(T),\\n Err(E)\\n}\\n```\\n\\n###### What does that mean though?\\n\\nWhen we have an `Ok` value, it has the result itself, and when we get an `Err`\\nvalue, it has the error. This also allows us to handle _results_ in a rather\\npretty way:\\n\\n```rust\\nmatch do_something(x) {\\n Ok(y) => {\\n println!(\\"SUCCESS: {}\\", y);\\n },\\n Err(y) => {\\n eprintln!(\\"ERROR: {}\\", y);\\n }\\n}\\n```\\n\\n:::\\n\\nMy solution has a following outline:\\n\\n```rust\\nfn execute(&self, i: &Instruction, output: &mut Output) -> State {\\n // execute the instruction\\n\\n // collect results if necessary\\n match output {\\n Output::Part1(x) => self.execute_part_1(y, x),\\n Output::Part2(x) => self.execute_part_2(y, x),\\n }\\n\\n // return the obtained state\\n new_state\\n}\\n```\\n\\nYou might think that it\'s a perfectly reasonable thing to do. Yes, **but** notice\\nthat the `match` statement doesn\'t _collect_ the changes in any way and also we\\npass `output` by `&mut`, so it is shared across each _iteration_ of the `fold`.\\n\\nThe dirty and ingenious thing is that `x`s are passed by `&mut` too and therefore\\nthey are directly modified by the helper functions. To sum it up and let it sit\\n\\n> We are **collecting** the result **into** an **enumeration** that is **shared**\\n> across **all** iterations of `fold`.\\n\\n### Solution\\n\\nSimilar to _Day 9_, but there are some technical details that can get you.\\n\\n## [Day 11: Monkey in the Middle](https://adventofcode.com/2022/day/11)\\n\\n:::info tl;dr\\n\\nSimulation of monkeys throwing stuff around and measuring your stress levels\\nwhile your stuff is being passed around.\\n\\n:::\\n\\nI think I decided to use regular expressions here for the first time, cause\\nparsing the input was a pain.\\n\\nAlso I didn\'t expect to implement Euclidean algorithm in Rust\u2026\\n\\n### Solution\\n\\nAgain, we\'re just running a simulation. Though I must admit it was very easy to\\nmake a small technical mistakes that could affect the final results very late.\\n\\n## [Day 12: Hill Climbing Algorithm](https://adventofcode.com/2022/day/12)\\n\\n:::info tl;dr\\n\\nFinding shortest path up the hill and also shortest path down to the ground while\\nalso rolling down the hill\u2026\\n\\n:::\\n\\nAs I have said in the _tl;dr_, we are looking for the shortest path, but the start\\nand goal differ for the part 1 and 2. So I have decided to refactor my solution\\nto a BFS algorithm that takes necessary parameters via functions:\\n\\n```rust\\nfn bfs<F, G>(\\n graph: &[Vec<char>], start: &Position, has_edge: F, is_target: G\\n) -> Option<usize>\\nwhere\\n F: Fn(&[Vec<char>], &Position, &Position) -> bool,\\n G: Fn(&[Vec<char>], &Position) -> bool\\n```\\n\\nWe pass the initial vertex from the caller and everything else is left to the BFS\\nalgorithm, based on the `has_edge` and `is_target` functions.\\n\\nThis was easy! And that is not very usual in Rust once you want to pass around\\nfunctions. :eyes:\\n\\n### Solution\\n\\nLooking for the shortest path\u2026 Must be Dijkstra, right? **Nope!** Half of the\\nReddit got jebaited though. In all fairness, nothing stops you from implementing\\nthe Dijkstra\'s algorithm for finding the shortest path, **but** if you know that\\nall connected vertices are in a unit (actually $d = 1$) distance from each other,\\nthen you know that running Dijkstra is equivalent to running BFS, only with worse\\ntime complexity, because of the priority heap instead of the queue.\\n\\n## [Day 13: Distress Signal](https://adventofcode.com/2022/day/13)\\n\\n:::info tl;dr\\n\\nProcessing packets with structured data from the distress signal.\\n\\n:::\\n\\nYou can implement a lot of traits if you want to. It is _imperative_ to implement\\nordering on the packets. I had a typo, so I also proceeded to implement a `Display`\\ntrait for debugging purposes:\\n\\n```rust\\nimpl Display for Packet {\\n fn fmt(&self, f: &mut std::fmt::Formatter<\'_>) -> std::fmt::Result {\\n match self {\\n Packet::Integer(x) => write!(f, \\"{x}\\"),\\n Packet::List(lst) => write!(f, \\"[{}]\\", lst.iter().map(|p| format!(\\"{p}\\")).join(\\",\\")),\\n }\\n }\\n}\\n```\\n\\n### Solution\\n\\nA lot of technical details\u2026 Parsing is nasty too\u2026\\n\\n## [Day 14: Regolith Reservoir](https://adventofcode.com/2022/day/14)\\n\\n:::info tl;dr\\n\\nLet\'s simulate falling sand grain-by-grain.\\n\\n:::\\n\\nAgain, both parts are relatively similar with minimal changes, so it is a good\\nidea to refactor it a bit. Similar approach to the [BFS above]. Also this is the\\nfirst day where I ran into efficiency issues and had to redo my solution to speed\\nit up just a bit.\\n\\n### Solution\\n\\nTedious.\\n\\n## Post Mortem\\n\\n### Indexing\\n\\nI was asked about the indexing after publishing the blog. And truly it is rather\\ncomplicated topic, especially after releasing `SliceIndex<I>` trait. I couldn\'t\\nleave it be, so I tried to implement the `Index` and `IndexMut` trait.\\n\\n:::note\\n\\nI have also mentioned that the `SliceIndex` trait is `unsafe`, but truth be told,\\nonly _unsafe_ part are the 2 methods that are named `*unchecked*`. Anyways, I will\\nbe implementing the `Index*` traits for now, rather than the `SliceIndex`.\\n\\n:::\\n\\nIt\'s relatively straightforward\u2026\\n\\n```rust\\nimpl<I, C> Index<Vector2D<I>> for [C]\\nwhere\\n I: Copy + TryInto<usize>,\\n <I as TryInto<usize>>::Error: Debug,\\n C: Index<usize>,\\n{\\n type Output = C::Output;\\n\\n fn index(&self, index: Vector2D<I>) -> &Self::Output {\\n let (x, y): (usize, usize) =\\n (index.x.try_into().unwrap(), index.y.try_into().unwrap());\\n &self[y][x]\\n }\\n}\\n\\nimpl<I, C> IndexMut<Vector2D<I>> for [C]\\nwhere\\n I: Copy + TryInto<usize>,\\n <I as TryInto<usize>>::Error: Debug,\\n C: IndexMut<usize>,\\n{\\n fn index_mut(&mut self, index: Vector2D<I>) -> &mut Self::Output {\\n let (x, y): (usize, usize) =\\n (index.x.try_into().unwrap(), index.y.try_into().unwrap());\\n &mut self[y][x]\\n }\\n}\\n```\\n\\nWe can see a lot of similarities to the implementation of `index` and `index_mut`\\nfunctions. In the end, they are 1:1, just wrapped in the trait that provides a\\nsyntax sugar for `container[idx]`.\\n\\n:::note\\n\\nI have also switched from using the `TryFrom` to `TryInto` trait, since it better\\nmatches what we are using, the `.try_into` rather than `usize::try_from`.\\n\\nAlso implementing `TryFrom` automatically provides you with a `TryInto` trait,\\nsince it is relatively easy to implement. Just compare the following:\\n\\n```rust\\npub trait TryFrom<T>: Sized {\\n type Error;\\n\\n fn try_from(value: T) -> Result<Self, Self::Error>;\\n}\\n\\npub trait TryInto<T>: Sized {\\n type Error;\\n\\n fn try_into(self) -> Result<T, Self::Error>;\\n}\\n```\\n\\n:::\\n\\nOK, so we have our trait implemented, we should be able to use `container[index]`,\\nright? Yes\u2026 but actually no :frowning:\\n\\n```\\nerror[E0277]: the type `[std::vec::Vec<i8>]` cannot be indexed by `aoc_2022::Vector2D<usize>`\\n --\x3e src/bin/day08.rs:26:18\\n |\\n26 | if trees[pos] > tallest {\\n | ^^^ slice indices are of type `usize` or ranges of `usize`\\n |\\n = help: the trait `std::slice::SliceIndex<[std::vec::Vec<i8>]>` is not implemented for `aoc_2022::Vector2D<usize>`\\n = note: required for `std::vec::Vec<std::vec::Vec<i8>>` to implement `std::ops::Index<aoc_2022::Vector2D<usize>>`\\n\\nerror[E0277]: the type `[std::vec::Vec<i8>]` cannot be indexed by `aoc_2022::Vector2D<usize>`\\n --\x3e src/bin/day08.rs:30:28\\n |\\n30 | max(tallest, trees[pos])\\n | ^^^ slice indices are of type `usize` or ranges of `usize`\\n |\\n = help: the trait `std::slice::SliceIndex<[std::vec::Vec<i8>]>` is not implemented for `aoc_2022::Vector2D<usize>`\\n = note: required for `std::vec::Vec<std::vec::Vec<i8>>` to implement `std::ops::Index<aoc_2022::Vector2D<usize>>`\\n\\nerror[E0277]: the type `[std::vec::Vec<i8>]` cannot be indexed by `aoc_2022::Vector2D<isize>`\\n --\x3e src/bin/day08.rs:52:28\\n |\\n52 | let max_height = trees[position];\\n | ^^^^^^^^ slice indices are of type `usize` or ranges of `usize`\\n |\\n = help: the trait `std::slice::SliceIndex<[std::vec::Vec<i8>]>` is not implemented for `aoc_2022::Vector2D<isize>`\\n = note: required for `std::vec::Vec<std::vec::Vec<i8>>` to implement `std::ops::Index<aoc_2022::Vector2D<isize>>`\\n```\\n\\nWhy? We have it implemented for the slices (`[C]`), why doesn\'t it work? Well,\\nthe fun part consists of the fact that in other place, where we were using it,\\nwe were passing the `&[Vec<T>]`, but this is coming from a helper functions that\\ntake `&Vec<Vec<T>>` instead. And\u2026 we don\'t implement `Index` and `IndexMut` for\\nthose. Just for the slices. \ud83e\udd2f _What are we going to do about it?_\\n\\nWe can either start copy-pasting or be smarter about it\u2026 I choose to be smarter,\\nso let\'s implement a macro! The only difference across the implementations are\\nthe types of the outer containers. Implementation doesn\'t differ **at all**!\\n\\nImplementing the macro can be done in a following way:\\n\\n```rust\\nmacro_rules! generate_indices {\\n ($container:ty) => {\\n impl<I, C> Index<Vector2D<I>> for $container\\n where\\n I: Copy + TryInto<usize>,\\n <I as TryInto<usize>>::Error: Debug,\\n C: Index<usize>,\\n {\\n type Output = C::Output;\\n\\n fn index(&self, index: Vector2D<I>) -> &Self::Output {\\n let (x, y): (usize, usize) =\\n (index.x.try_into().unwrap(), index.y.try_into().unwrap());\\n &self[y][x]\\n }\\n }\\n\\n impl<I, C> IndexMut<Vector2D<I>> for $container\\n where\\n I: Copy + TryInto<usize>,\\n <I as TryInto<usize>>::Error: Debug,\\n C: IndexMut<usize>,\\n {\\n fn index_mut(&mut self, index: Vector2D<I>) -> &mut Self::Output {\\n let (x, y): (usize, usize) =\\n (index.x.try_into().unwrap(), index.y.try_into().unwrap());\\n &mut self[y][x]\\n }\\n }\\n };\\n}\\n```\\n\\nAnd now we can simply do\\n\\n```rust\\ngenerate_indices!(VecDeque<C>);\\ngenerate_indices!([C]);\\ngenerate_indices!(Vec<C>);\\n// generate_indices!([C; N], const N: usize);\\n```\\n\\nThe last type (I took the inspiration from the implementations of the `Index` and\\n`IndexMut` traits) is a bit problematic, because of the `const N: usize` part,\\nwhich I haven\'t managed to be able to parse. And that\'s how I got rid of the error.\\n\\n:::note\\n\\nIf I were to use 2D-indexing over `[C; N]` slices, I\'d probably just go with the\\ncopy-paste, cause the cost of this \u201cmonstrosity\u201d outweighs the benefits of no DRY.\\n\\n:::\\n\\n#### Cause of the problem\\n\\nThis issue is relatively funny. If you don\'t use any type aliases, just the raw\\ntypes, you\'ll get suggested certain changes by the _clippy_. For example if you\\nconsider the following piece of code\\n\\n```rust\\nfn get_sum(nums: &Vec<i32>) -> i32 {\\n nums.iter().sum()\\n}\\n\\nfn main() {\\n let nums = vec![1, 2, 3];\\n println!(\\"Sum: {}\\", get_sum(&nums));\\n}\\n```\\n\\nand you run _clippy_ on it, you will get\\n\\n```\\nChecking playground v0.0.1 (/playground)\\nwarning: writing `&Vec` instead of `&[_]` involves a new object where a slice will do\\n --\x3e src/main.rs:1:18\\n |\\n1 | fn get_sum(nums: &Vec<i32>) -> i32 {\\n | ^^^^^^^^^ help: change this to: `&[i32]`\\n |\\n = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg\\n = note: `#[warn(clippy::ptr_arg)]` on by default\\n\\nwarning: `playground` (bin \\"playground\\") generated 1 warning\\n Finished dev [unoptimized + debuginfo] target(s) in 0.61s\\n```\\n\\nHowever, if you introduce a type alias, such as\\n\\n```rust\\ntype Numbers = Vec<i32>;\\n```\\n\\nThen _clippy_ won\'t say anything, cause there is literally nothing to suggest.\\nHowever the outcome is not the same\u2026\\n\\n[_advent of code_]: https://adventofcode.com\\n[bfs above]: #day-12-hill-climbing-algorithm"},{"id":"aoc-2022/1st-week","metadata":{"permalink":"/blog/aoc-2022/1st-week","editUrl":"https://github.com/mfocko/blog/tree/main/blog/aoc-2022/01-week-1.md","source":"@site/blog/aoc-2022/01-week-1.md","title":"1st week of Advent of Code \'22 in Rust","description":"Surviving first week in Rust.","date":"2022-12-15T01:15:00.000Z","formattedDate":"December 15, 2022","tags":[{"label":"advent-of-code","permalink":"/blog/tags/advent-of-code"},{"label":"advent-of-code-2022","permalink":"/blog/tags/advent-of-code-2022"},{"label":"rust","permalink":"/blog/tags/rust"}],"readingTime":12.4,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"1st week of Advent of Code \'22 in Rust","description":"Surviving first week in Rust.","date":"2022-12-15T01:15","slug":"aoc-2022/1st-week","authors":"mf","tags":["advent-of-code","advent-of-code-2022","rust"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"2nd week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/2nd-week"},"nextItem":{"title":"Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/intro"}},"content":"Let\'s go through the first week of [_Advent of Code_] in Rust.\\n\\n\x3c!--truncate--\x3e\\n\\n:::note\\n\\nIf you wish to have a look at the solutions, you can follow them on my [GitLab].\\nMore specifically in the [`/src/bin/`].\\n\\n:::\\n\\nI will try to summarize my experience with using Rust for the AoC. Trying it out\\nages ago, I believe it will be _pain and suffering_, but we will see. For each\\nday I will also try to give a tl;dr of the problem, so that you can better imagine\\nthe relation to my woes or :+1: moments.\\n\\n## [Day 1: Calorie Counting](https://adventofcode.com/2022/day/1)\\n\\n:::info tl;dr\\n\\nAs the name suggests, we get the calories of the food contained in the elves\\nbackpacks and we want to choose the elf that has the most food ;)\\n\\n:::\\n\\n> Wakey wakey!\\n\\nProgramming in Rust at 6am definitely hits. I\'ve also forgotten to mention how I\\nhandle samples. With each puzzle you usually get a sample input and expected\\noutput. You can use them to verify that your solution works, or usually doesn\'t.\\n\\nAt first I\'ve decided to put asserts into my `main`, something like\\n\\n```rust\\nassert_eq!(part_1(&sample), 24000);\\ninfo!(\\"Part 1: {}\\", part_1(&input));\\n\\nassert_eq!(part_2(&sample), 45000);\\ninfo!(\\"Part 2: {}\\", part_2(&input));\\n```\\n\\nHowever, once you get further, the sample input may take some time to run itself.\\nSo in the end, I have decided to turn them into unit tests:\\n\\n```rust\\n#[cfg(test)]\\nmod tests {\\n use super::*;\\n\\n #[test]\\n fn test_part_1() {\\n let sample = parse_input(\\"samples/day01.txt\\");\\n assert_eq!(part_1(&sample), 24000);\\n }\\n\\n #[test]\\n fn test_part_2() {\\n let sample = parse_input(\\"samples/day01.txt\\");\\n assert_eq!(part_2(&sample), 45000);\\n }\\n}\\n```\\n\\nAnd later on I have noticed, it\'s hard to tell the difference between the days,\\nso I further renamed the `mod` from generic `tests` to reflect the days.\\n\\nAlso after finishing the first day puzzle, I have installed an [`sccache`] to\\ncache the builds, so that the build time is lower, cause it was kinda unbearable.\\n\\n### Solution\\n\\nWell, it\'s a pretty simple problem. You just take the input, sum the calories and\\nfind the biggest one. However, if we try to generalize to more than the biggest\\none, the fun appears. We have few options:\\n\\n- keep all the calories, sort them, take what we need\\n- keep all the calories and use max heap\\n- use min heap and maintain at most N calories that we need\\n\\n## [Day 2: Rock Paper Scissors](https://adventofcode.com/2022/day/2)\\n\\n:::info tl;dr\\n\\nYou want to know what score did you achieve while playing _Rock Paper Scissors_.\\nAnd then you want to be strategic about it.\\n\\n:::\\n\\nApart from the technical details of the puzzle, it went relatively smooth.\\n\\n### Solution\\n\\nI took relatively na\xefve approach and then tried to simplify it.\\n\\n## [Day 3: Rucksack Reorganization](https://adventofcode.com/2022/day/3)\\n\\n:::info tl;dr\\n\\nLet\'s go reorganize elves\' backpacks! Each backpacks has 2 compartments and you\\nwant to find the common item among those compartments. Each of them has priority,\\nyou care only about the sum.\\n\\n:::\\n\\nThis is the day where I started to fight the compiler and neither of us decided\\nto give up. Let\'s dive into it \\\\o/\\n\\n:::tip Fun fact\\n\\nFighting the compiler took me 30 minutes.\\n\\n:::\\n\\nWe need to find a common item among 2 collections, that\'s an easy task, right?\\nWe can construct 2 sets and find an intersection:\\n\\n```rust\\nlet top: HashSet<i32> = [1, 2, 3].iter().collect();\\nlet bottom: HashSet<i32> = [3, 4, 5].iter().collect();\\n```\\n\\nNow, the first issue that we encounter is caused by the fact that we are using\\na slice (the `[\u2026]`), iterator of that returns **references** to the numbers.\\nAnd we get immediately yelled at by the compiler, because the numbers are discarded\\nafter running the `.collect`. To fix this, we can use `.into_iter`:\\n\\n```rust\\nlet top: HashSet<i32> = [1, 2, 3].into_iter().collect();\\nlet bottom: HashSet<i32> = [3, 4, 5].into_iter().collect();\\n```\\n\\nThis way the numbers will get copied instead of referenced. OK, let\'s find the\\nintersection of those 2 collections:\\n\\n```rust\\nprintln!(\\"Common elements: {:?}\\", top.intersection(&bottom));\\n```\\n\\n```\\nCommon elements: [3]\\n```\\n\\n:::caution\\n\\nNotice that we need to do `&bottom`. It explicitly specifies that `.intersection`\\n**borrows** the `bottom`, i.e. takes an immutable reference to it.\\n\\n:::\\n\\nThat\'s what we want, right? Looks like it! \\\\o/\\n\\nNext part wants us to find the common element among all of the backpacks. OK, so\\nthat should be fairly easy, we have an intersection and we want to find intersection\\nover all of them.\\n\\nLet\'s have a look at the type of the `.intersection`\\n\\n```rust\\npub fn intersection<\'a>(\\n\xa0\xa0\xa0\xa0&\'a self,\\n\xa0\xa0\xa0\xa0other: &\'a HashSet<T, S>\\n) -> Intersection<\'a, T, S>\\n```\\n\\nOK\u2026 Huh\u2026 But we have an example there!\\n\\n```rust\\nlet intersection: HashSet<_> = a.intersection(&b).collect();\\n```\\n\\nCool, that\'s all we need.\\n\\n```rust\\nlet top: HashSet<i32> = [1, 2, 3, 4].into_iter().collect();\\nlet bottom: HashSet<i32> = [3, 4, 5, 6].into_iter().collect();\\nlet top_2: HashSet<i32> = [2, 3, 4, 5, 6].into_iter().collect();\\nlet bottom_2: HashSet<i32> = [4, 5, 6].into_iter().collect();\\n\\nlet intersection: HashSet<_> = top.intersection(&bottom).collect();\\nprintln!(\\"Intersection: {:?}\\", intersection);\\n```\\n\\n```\\nIntersection: {3, 4}\\n```\\n\\nCool, so let\'s do the intersection with the `top_2`:\\n\\n```rust\\nlet top: HashSet<i32> = [1, 2, 3, 4].into_iter().collect();\\nlet bottom: HashSet<i32> = [3, 4, 5, 6].into_iter().collect();\\nlet top_2: HashSet<i32> = [2, 3, 4, 5, 6].into_iter().collect();\\nlet bottom_2: HashSet<i32> = [4, 5, 6].into_iter().collect();\\n\\nlet intersection: HashSet<_> = top.intersection(&bottom).collect();\\nlet intersection: HashSet<_> = intersection.intersection(&top_2).collect();\\nprintln!(\\"Intersection: {:?}\\", intersection);\\n```\\n\\nAnd we get yelled at by the compiler:\\n\\n```\\nerror[E0308]: mismatched types\\n --\x3e src/main.rs:10:58\\n |\\n10 | let intersection: HashSet<_> = intersection.intersection(&top_2).collect();\\n | ------------ ^^^^^^ expected `&i32`, found `i32`\\n | |\\n | arguments to this function are incorrect\\n |\\n = note: expected reference `&HashSet<&i32>`\\n found reference `&HashSet<i32>`\\n```\\n\\n/o\\\\ What the hell is going on here? Well, the funny thing is, that this operation\\ndoesn\'t return the elements themselves, but the references to them and when we pass\\nthe third set, it has just the values themselves, without any references.\\n\\n:::tip\\n\\nIt may seem as a very weird decision, but in fact it makes some sense\u2026 It allows\\nyou to do intersection of items that may not be possible to copy. Overall this is\\na \u201ctax\u201d for having a borrow checker ~~drilling your ass~~ having your back and\\nmaking sure you\'re not doing something naughty that may cause an **undefined**\\n**behavior**.\\n\\n:::\\n\\nTo resolve this we need to get an iterator that **clones** the elements:\\n\\n```rust\\nlet top: HashSet<i32> = [1, 2, 3, 4].into_iter().collect();\\nlet bottom: HashSet<i32> = [3, 4, 5, 6].into_iter().collect();\\nlet top_2: HashSet<i32> = [2, 3, 4, 5, 6].into_iter().collect();\\nlet bottom_2: HashSet<i32> = [4, 5, 6].into_iter().collect();\\n\\nlet intersection: HashSet<_> = top.intersection(&bottom).cloned().collect();\\nlet intersection: HashSet<_> = intersection.intersection(&top_2).cloned().collect();\\nlet intersection: HashSet<_> = intersection.intersection(&bottom_2).cloned().collect();\\nprintln!(\\"Intersection: {:?}\\", intersection);\\n```\\n\\n```\\nIntersection: {4}\\n```\\n\\n### Solution\\n\\nThe approach is pretty simple, if you omit the _1on1 with the compiler_. You just\\nhave some fun with the set operations :)\\n\\n## [Day 4: Camp Cleanup](https://adventofcode.com/2022/day/4)\\n\\n:::info tl;dr\\n\\nElves are cleaning up the camp and they got overlapping sections to clean up.\\nFind how many overlap and can take the day off.\\n\\n:::\\n\\n[`RangeInclusive`] is your friend not an enemy :)\\n\\n### Solution\\n\\nRelatively easy, you just need to parse the input and know what you want. Rust\'s\\n`RangeInclusive` type helped a lot, cause it took care of all abstractions.\\n\\n## [Day 5: Supply Stacks](https://adventofcode.com/2022/day/5)\\n\\n:::info tl;dr\\n\\nLet\'s play with stacks of crates.\\n\\n:::\\n\\nVery easy problem with very annoying input. You can judge yourself:\\n\\n```\\n [D]\\n[N] [C]\\n[Z] [M] [P]\\n 1 2 3\\n\\nmove 1 from 2 to 1\\nmove 3 from 1 to 3\\nmove 2 from 2 to 1\\nmove 1 from 1 to 2\\n```\\n\\nGood luck transforming that into something reasonable :)\\n\\n:::tip Fun fact\\n\\nTook me 40 minutes to parse this reasonably, including fighting the compiler.\\n\\n:::\\n\\n### Solution\\n\\nFor the initial solution I went with a manual solution (as in _I have done all_\\n_the work_. Later on I have decided to explore the `std` and interface of the\\n`std::vec::Vec` and found [`split_off`] which takes an index and splits (duh)\\nthe vector:\\n\\n```rust\\nlet mut vec = vec![1, 2, 3];\\nlet vec2 = vec.split_off(1);\\nassert_eq!(vec, [1]);\\nassert_eq!(vec2, [2, 3]);\\n```\\n\\nThis helped me simplify my solution a lot and also get rid of some _edge cases_.\\n\\n## [Day 6: Tuning Trouble](https://adventofcode.com/2022/day/6)\\n\\n:::info tl;dr\\n\\nFinding start of the message in a very weird protocol. Start of the message is\\ndenoted by $N$ unique consecutive characters.\\n\\n:::\\n\\n### Solution\\n\\nA lot of different approaches, knowing that we are dealing with input consisting\\nsolely of ASCII letters, I bit the bullet and went with sliding window and\\nconstructing sets from that window, checking if the set is as big as the window.\\n\\nOne possible optimization could consist of keeping a bit-vector (i.e. `usize`\\nvariable) of encountered characters and updating it as we go. However this has\\na different issue and that is removal of the characters from the left side of the\\nwindow. We don\'t know if the same character is not included later on.\\n\\nOther option is to do similar thing, but keeping the frequencies of the letters,\\nand again knowing we have only ASCII letters we can optimize by having a vector\\nof 26 elements that keeps count for each lowercase letter.\\n\\n## [Day 7: No Space Left On Device](https://adventofcode.com/2022/day/7)\\n\\n:::info tl;dr\\n\\nLet\'s simulate [`du`] to get some stats about our file system and then pinpoint\\ndirectories that take a lot of space and should be deleted.\\n\\n:::\\n\\n> I was waiting for this moment, and yet it got me!\\n> _imagine me swearing for hours_\\n\\n### Solution\\n\\nWe need to \u201c_build_\u201d a file system from the input that is given in a following form:\\n\\n```\\n$ cd /\\n$ ls\\ndir a\\n14848514 b.txt\\n8504156 c.dat\\ndir d\\n$ cd a\\n$ ls\\ndir e\\n29116 f\\n2557 g\\n62596 h.lst\\n$ cd e\\n$ ls\\n584 i\\n$ cd ..\\n$ cd ..\\n$ cd d\\n$ ls\\n4060174 j\\n8033020 d.log\\n5626152 d.ext\\n7214296 k\\n```\\n\\nThere are few ways in which you can achieve this and also you can assume some\\npreconditions, but why would we do that, right? :)\\n\\nYou can \u201cslap\u201d this in either [`HashMap`] or [`BTreeMap`] and call it a day.\\nAnd that would be boring\u2026\\n\\n:::tip\\n\\n`BTreeMap` is quite fitting for this, don\'t you think?\\n\\n:::\\n\\nI always wanted to try allocation on heap in Rust, so I chose to implement a tree.\\nI fought with the `Box<T>` for some time and was losing\u2026\\n\\nThen I looked up some implementations of trees or linked lists and decided to try\\n`Rc<Cell<T>>`. And I got my _ass whopped_ by the compiler once again. /o\\\\\\n\\n:::tip\\n\\n`Box<T>` represents a dynamically allocated memory on heap. It is a single pointer,\\nyou can imagine this as `std::unique_ptr<T>` in C++.\\n\\n`Rc<T>` represents a dynamically allocated memory on heap. On top of that it is\\n_reference counted_ (that\'s what the `Rc` stands for). You can imagine this as\\n`std::shared_ptr<T>` in C++.\\n\\nNow the fun stuff. Neither of them lets you **mutate** the contents of the memory.\\n\\n`Cell<T>` allows you to mutate the memory. Can be used reasonably with types that\\ncan be copied, because the memory safety is guaranteed by copying the contents\\nwhen there is more than one **mutable** reference to the memory.\\n\\n`RefCell<T>` is similar to the `Cell<T>`, but the borrowing rules (how many mutable\\nreferences are present) are checked dynamically.\\n\\nSo in the end, if you want something like `std::shared_ptr<T>` in Rust, you want\\nto have `Rc<RefCell<T>>`.\\n\\n:::\\n\\nSo, how are we going to represent the file system then? We will use an enumeration,\\nhehe, which is an algebraic data type that can store some stuff in itself :weary:\\n\\n```rust\\ntype FileHandle = Rc<RefCell<AocFile>>;\\n\\n#[derive(Debug)]\\nenum AocFile {\\n File(usize),\\n Directory(BTreeMap<String, FileHandle>),\\n}\\n```\\n\\nLet\'s go over it! `FileHandle` represents dynamically allocated `AocFile`, not\\nmuch to discuss. What does the `#[derive(Debug)]` do though? It lets us to print\\nout the value of that enumeration, it\'s derived, so it\'s not as good as if we had\\nimplemented it ourselves, but it\'s good enough for debugging, hence the name.\\n\\nNow to the fun part! `AocFile` value can be represented in two ways:\\n\\n- `File(usize)`, e.g. `AocFile::File(123)` and we can pattern match it, if we\\n need to\\n- `Directory(BTreeMap<String, FileHandle>)` will represent the directory and will\\n contain map matching the name of the files (or directories) within to their\\n respective file handles\\n\\nI will omit the details about constructing this file system, cause there are a lot\\nof technicalities introduced by the nature of the input. However if you are\\ninterested, you can have a look at my solution.\\n\\nWe need to find small enough directories and also find the smallest directory that\\nwill free enough space. Now the question is, how could we do that. And there are\\nmultiple ways I will describe.\\n\\nI have chosen to implement [_tree catamorphism_] :weary:. It is basically a fold\\nover a tree data structure. We descent down into the leaves and propagate computed\\nresults all the way to the root. You can also notice that this approach is very\\nsimilar to _dynamic programming_, we find overlapping sections of the computation\\nand try to minimize the additional work (in this case: we need to know sizes of\\nour descendants, but we have already been there).\\n\\nAnother approach that has been suggested to me few days later is running DFS on\\nthe graph. And, funnily enough, we would still need to combine what we found in\\nthe branches where we descent. So in the end, it would work very similarly to my\\nsolution.\\n\\nOne of the more exotic options would be precomputing the required information at\\nthe same time as parsing. That could be done by adding additional fields to the\\nnodes which would allow storing such information and updating it as we construct\\nthe file system.\\n\\n## Post Mortem\\n\\nThings that have been brought up in the discussion later on.\\n\\n### `Rc<T>` vs `Rc<RefCell<T>>`\\n\\nIt has been brought up that I have a contradicting statement regarding the\\ndynamically allocated memory. Specifically:\\n\\n- You can imagine `Rc<T>` as an `std::shared_ptr<T>` (in C++)\\n- When you want an equivalent of `std::shared_ptr<T>`, you want to use\\n `Rc<RefCell<T>>`\\n\\nNow, in Rust it is a bit more complicated, because the type that represents the\\n\u201cshared pointer\u201d is `Rc<T>`. What `RefCell<T>` does is making sure that there is\\nonly one \u201cowner\u201d of a mutable reference at a time (and dynamically, as opposed\\nto the `Cell<T>`).\\n\\nTherefore to be precise and correct about the equivalents of `std::shared_ptr<T>`\\nin Rust, we can say that\\n\\n- `Rc<T>` is an equivalent of a `const std::shared_ptr<T>`,\\n- and `Rc<RefCell<T>>` is an equivalent of a `std::shared_ptr<T>`.\\n\\nYou can easily see that they only differ in the mutability. (And even that is not\\nas simple as it seems, because there is also `Cell<T>`)\\n\\n[_advent of code_]: https://adventofcode.com\\n[gitlab]: https://gitlab.com/mfocko/advent-of-code-2022\\n[`/src/bin/`]: https://gitlab.com/mfocko/advent-of-code-2022/-/tree/main/src/bin\\n[`sccache`]: https://github.com/mozilla/sccache\\n[`rangeinclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html\\n[`split_off`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.split_off\\n[`du`]: https://www.man7.org/linux/man-pages/man1/du.1.html\\n[`hashmap`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html\\n[`btreemap`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html\\n[_tree catamorphism_]: https://en.wikipedia.org/wiki/Catamorphism#Tree_fold"},{"id":"aoc-2022/intro","metadata":{"permalink":"/blog/aoc-2022/intro","editUrl":"https://github.com/mfocko/blog/tree/main/blog/aoc-2022/00-intro.md","source":"@site/blog/aoc-2022/00-intro.md","title":"Advent of Code \'22 in Rust","description":"Preparing for Advent of Code \'22.","date":"2022-12-14T21:45:00.000Z","formattedDate":"December 14, 2022","tags":[{"label":"advent-of-code","permalink":"/blog/tags/advent-of-code"},{"label":"advent-of-code-2022","permalink":"/blog/tags/advent-of-code-2022"},{"label":"rust","permalink":"/blog/tags/rust"}],"readingTime":8.665,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"Advent of Code \'22 in Rust","description":"Preparing for Advent of Code \'22.","date":"2022-12-14T21:45","slug":"aoc-2022/intro","authors":"mf","tags":["advent-of-code","advent-of-code-2022","rust"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"1st week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/1st-week"}},"content":"Let\'s talk about the preparations for this year\'s [_Advent of Code_].\\n\\n\x3c!--truncate--\x3e\\n\\n## Choosing a language\\n\\nWhen choosing a language for AoC, you usually want a language that gives you a\\nquick feedback which allows you to iterate quickly to the solution of the puzzle.\\nOne of the most common choices is Python, many people also use JavaScript or Ruby.\\n\\nGiven the competitive nature of the AoC and popularity among competitive programming,\\nC++ might be also a very good choice. Only if you are familiar with it, I guess\u2026\\n\\nIf you want a challenge, you might also choose to rotate the languages each day.\\nThough I prefer to use only one language.\\n\\nFor this year I have been deciding between _Rust_, _C++_ and _Pascal_ or _Ada_.\\n\\nI have tried Rust last year and have survived with it for 3 days and then gave\\nup and switched to _Kotlin_, which was pretty good given it is \u201cJava undercover\u201d.\\nI pretty much like the ideas behind Rust, I am not sure about the whole cult and\\nimplementation of those ideas though. After some years with C/C++, I would say\\nthat Rust feels _too safe_ for my taste and tries to \u201c_punish me_\u201d even for the\\nmost trivial things.\\n\\nC++ is a very robust, but also comes with a wide variety of options providing you\\nthe ability to shoot yourself in the leg. I have tried to solve few days of previous\\nAdvent of Code events, it was _relatively easy_ to solve the problems in C++, given\\nthat I do not admit writing my own iterator for `enumerate`\u2026\\n\\nPascal or Ada were meme choices :) Ada is heavily inspired by Pascal and has a\\npretty nice standard library that offers enough to be able to quickly solve some\\nproblems in it. However the toolkit is questionable :/\\n\\n## Choosing libraries\\n\\n## Preparations for Rust\\n\\nAll of the sources, later on including solutions, can be found at my\\n[GitLab].\\n\\n### Toolkit\\n\\nSince we are using Rust, we are going to use a [Cargo] and more than likely VSCode\\nwith [`rust-analyzer`]. Because of my choice of libraries, we will also introduce\\na `.envrc` file that can be used by [`direnv`], which allows you to set specific\\nenvironment variables when you enter a directory. In our case, we will use\\n\\n```bash\\n# to show nice backtrace when using the color-eyre\\nexport RUST_BACKTRACE=1\\n\\n# to catch logs generated by tracing\\nexport RUST_LOG=trace\\n```\\n\\nAnd for the one of the most obnoxious things ever, we will use a script to download\\nthe inputs instead of \u201c_clicking, opening and copying to a file_\u201d[^1]. There is\\nno need to be _fancy_, so we will adjust Python script by Martin[^2].\\n\\n```py\\n#!/usr/bin/env python3\\n\\nimport datetime\\nimport yaml\\nimport requests\\nimport sys\\n\\n\\ndef load_config():\\n with open(\\"env.yaml\\", \\"r\\") as f:\\n js = yaml.load(f, Loader=yaml.Loader)\\n return js[\\"session\\"], js[\\"year\\"]\\n\\n\\ndef get_input(session, year, day):\\n return requests.get(\\n f\\"https://adventofcode.com/{year}/day/{day}/input\\",\\n cookies={\\"session\\": session},\\n headers={\\n \\"User-Agent\\": \\"{repo} by {mail}\\".format(\\n repo=\\"gitlab.com/mfocko/advent-of-code-2022\\",\\n mail=\\"me@mfocko.xyz\\",\\n )\\n },\\n ).content.decode(\\"utf-8\\")\\n\\n\\ndef main():\\n day = datetime.datetime.now().day\\n if len(sys.argv) == 2:\\n day = sys.argv[1]\\n\\n session, year = load_config()\\n problem_input = get_input(session, year, day)\\n\\n with open(f\\"./inputs/day{day:>02}.txt\\", \\"w\\") as f:\\n f.write(problem_input)\\n\\n\\nif __name__ == \\"__main__\\":\\n main()\\n```\\n\\nIf the script is called without any arguments, it will deduce the day from the\\nsystem, so we do not need to change the day every morning. It also requires a\\nconfiguration file:\\n\\n```yaml\\n# env.yaml\\nsession: \u2039your session cookie\u203a\\nyear: 2022\\n```\\n\\n### Libraries\\n\\nLooking at the list of the libraries, I have chosen \u201ca lot\u201d of them. Let\'s walk\\nthrough each of them.\\n\\n[`tracing`] and [`tracing-subscriber`] are the crates that can be used for tracing\\nand logging of your Rust programs, there are also other crates that can help you\\nwith providing backtrace to the Sentry in case you have deployed your application\\nsomewhere and you want to watch over it. In our use case we will just utilize the\\nmacros for debugging in the terminal.\\n\\n[`thiserror`], [`anyhow`] and [`color-eyre`] are used for error reporting.\\n`thiserror` is a very good choice for libraries, cause it extends the `Error`\\nfrom the `std` and allows you to create more convenient error types. Next is\\n`anyhow` which kinda builds on top of the `thiserror` and provides you with simpler\\nerror handling in binaries[^3]. And finally we have `color-eyre` which, as I found\\nout later, is a colorful (_wink wink_) extension of `eyre` which is fork of `anyhow`\\nwhile supporting customized reports.\\n\\nIn the end I have decided to remove `thiserror` and `anyhow`, since first one is\\nsuitable for libraries and the latter was basically fully replaced by `{color-,}eyre`.\\n\\n[`regex`] and [`lazy_static`] are a very good and also, I hope, self-explanatory\\ncombination. `lazy_static` allows you to have static variables that must be initialized\\nduring runtime.\\n\\n[`itertools`] provides some nice extensions to the iterators from the `std`.\\n\\n### My own \u201clibrary\u201d\\n\\nWhen creating the crate for this year\'s Advent of Code, I have chosen a library\\ntype. Even though standard library is huge, some things might not be included and\\nalso we can follow _KISS_. I have 2 modules that my \u201clibrary\u201d exports, one for\\nparsing and one for 2D vector (that gets used quite often during Advent of Code).\\n\\nKey part is, of course, processing the input and my library exports following\\nfunctions that get used a lot:\\n\\n```rust\\n/// Reads file to the string.\\npub fn file_to_string<P: AsRef<Path>>(pathname: P) -> String;\\n\\n/// Reads file and returns it as a vector of characters.\\npub fn file_to_chars<P: AsRef<Path>>(pathname: P) -> Vec<char>;\\n\\n/// Reads file and returns a vector of parsed structures. Expects each structure\\n/// on its own line in the file. And `T` needs to implement `FromStr` trait.\\npub fn file_to_structs<P: AsRef<Path>, T: FromStr>(pathname: P) -> Vec<T>\\nwhere\\n <T as FromStr>::Err: Debug;\\n\\n/// Converts iterator over strings to a vector of parsed structures. `T` needs\\n/// to implement `FromStr` trait and its error must derive `Debug` trait.\\npub fn strings_to_structs<T: FromStr, U>(\\n iter: impl Iterator<Item = U>\\n) -> Vec<T>\\nwhere\\n <T as std::str::FromStr>::Err: std::fmt::Debug,\\n U: Deref<Target = str>;\\n\\n/// Reads file and returns it as a vector of its lines.\\npub fn file_to_lines<P: AsRef<Path>>(pathname: P) -> Vec<String>;\\n```\\n\\nAs for the vector, I went with a rather simple implementation that allows only\\naddition of the vectors for now and accessing the elements via functions `x()`\\nand `y()`. Also the vector is generic, so we can use it with any numeric type we\\nneed.\\n\\n### Skeleton\\n\\nWe can also prepare a template to quickly bootstrap each of the days. We know\\nthat each puzzle has 2 parts, which means that we can start with 2 functions that\\nwill solve them.\\n\\n```rust\\nfn part1(input: &Input) -> Output {\\n todo!()\\n}\\n\\nfn part2(input: &Input) -> Output {\\n todo!()\\n}\\n```\\n\\nBoth functions take reference to the input and return some output (in majority\\nof puzzles, it is the same type). `todo!()` can be used as a nice placeholder,\\nit also causes a panic when reached and we could also provide some string with\\nan explanation, e.g. `todo!(\\"part 1\\")`. We have not given functions a specific\\ntype and to avoid as much copy-paste as possible, we will introduce type aliases.\\n\\n```rust\\ntype Input = String;\\ntype Output = i32;\\n```\\n\\n:::tip\\n\\nThis allows us to quickly adjust the types only in one place without the need to\\ndo _regex-replace_ or replace them manually.\\n\\n:::\\n\\nFor each day we get a personalized input that is provided as a text file. Almost\\nall the time, we would like to get some structured type out of that input, and\\ntherefore it makes sense to introduce a new function that will provide the parsing\\nof the input.\\n\\n```rust\\nfn parse_input(path: &str) -> Input {\\n todo!()\\n}\\n```\\n\\nThis \u201cparser\u201d will take a path to the file, just in case we would like to run the\\nsample instead of input.\\n\\nOK, so now we can write a `main` function that will take all of the pieces and\\nrun them.\\n\\n```rust\\nfn main() {\\n let input = parse_input(\\"inputs/dayXX.txt\\");\\n\\n println!(\\"Part 1: {}\\", part_1(&input));\\n println!(\\"Part 2: {}\\", part_2(&input));\\n}\\n```\\n\\nThis would definitely do :) But we have installed a few libraries and we want to\\nuse them. In this part we are going to utilize _[`tracing`]_ (for tracing, duh\u2026)\\nand _[`color-eyre`]_ (for better error reporting, e.g. from parsing).\\n\\n```rust\\nfn main() -> Result<()> {\\n tracing_subscriber::fmt()\\n .with_env_filter(EnvFilter::from_default_env())\\n .with_target(false)\\n .with_file(true)\\n .with_line_number(true)\\n .without_time()\\n .compact()\\n .init();\\n color_eyre::install()?;\\n\\n let input = parse_input(\\"inputs/dayXX.txt\\");\\n\\n info!(\\"Part 1: {}\\", part_1(&input));\\n info!(\\"Part 2: {}\\", part_2(&input));\\n\\n Ok(())\\n}\\n```\\n\\nThe first statement will set up tracing and configure it to print out the logs to\\nterminal, based on the environment variable. We also change the formatting a bit,\\nsince we do not need all the _fancy_ features of the logger. Pure initialization\\nwould get us logs like this:\\n\\n```\\n2022-12-11T19:53:19.975343Z INFO day01: Part 1: 0\\n```\\n\\nHowever after running that command, we will get the following:\\n\\n```\\n INFO src/bin/day01.rs:35: Part 1: 0\\n```\\n\\nAnd the `color_eyre::install()?` is quite straightforward. We just initialize the\\nerror reporting by _color eyre_.\\n\\n:::caution\\n\\nNotice that we had to add `Ok(())` to the end of the function and adjust the\\nreturn type of the `main` to `Result<()>`. It is caused by the _color eyre_ that\\ncan be installed only once and therefore it can fail, that is how we got the `?`\\nat the end of the `::install` which _unwraps_ the **\xbbresult\xab** of the installation.\\n\\n:::\\n\\nOverall we will get to a template like this:\\n\\n```rust\\nuse aoc_2022::*;\\n\\nuse color_eyre::eyre::Result;\\nuse tracing::info;\\nuse tracing_subscriber::EnvFilter;\\n\\ntype Input = String;\\ntype Output = i32;\\n\\nfn parse_input(path: &str) -> Input {\\n todo!()\\n}\\n\\nfn part1(input: &Input) -> Output {\\n todo!()\\n}\\n\\nfn part2(input: &Input) -> Output {\\n todo!()\\n}\\n\\nfn main() -> Result<()> {\\n tracing_subscriber::fmt()\\n .with_env_filter(EnvFilter::from_default_env())\\n .with_target(false)\\n .with_file(true)\\n .with_line_number(true)\\n .without_time()\\n .compact()\\n .init();\\n color_eyre::install()?;\\n\\n let input = parse_input(\\"inputs/dayXX.txt\\");\\n\\n info!(\\"Part 1: {}\\", part_1(&input));\\n info!(\\"Part 2: {}\\", part_2(&input));\\n\\n Ok(())\\n}\\n```\\n\\n[^1]:\\n Copy-pasting might be a relaxing thing to do, but you can also discover\\n nasty stuff about your PC. See [this Reddit post and the comment].\\n\\n[^2]: [GitHub profile](https://github.com/martinjonas)\\n[^3]:\\n Even though you can use it even for libraries, but handling errors from\\n libraries using `anyhow` is nasty\u2026 You will be the stinky one ;)\\n\\n[_advent of code_]: https://adventofcode.com\\n[gitlab]: https://gitlab.com/mfocko/advent-of-code-2022\\n[cargo]: https://doc.rust-lang.org/cargo/\\n[`rust-analyzer`]: https://rust-analyzer.github.io/\\n[`direnv`]: https://direnv.net/\\n[`tracing`]: https://crates.io/crates/tracing\\n[`tracing-subscriber`]: https://crates.io/crates/tracing-subscriber\\n[`thiserror`]: https://crates.io/crates/thiserror\\n[`anyhow`]: https://crates.io/crates/anyhow\\n[`color-eyre`]: https://crates.io/crates/color-eyre\\n[`regex`]: https://crates.io/crates/regex\\n[`lazy_static`]: https://crates.io/crates/lazy_static\\n[`itertools`]: https://crates.io/crates/itertools\\n[this reddit post and the comment]: https://www.reddit.com/r/adventofcode/comments/zb98pn/comment/iyq0ono"}]}')}}]); \ No newline at end of file diff --git a/assets/js/4200b1a9.d764baec.js b/assets/js/4200b1a9.d764baec.js deleted file mode 100644 index e320695..0000000 --- a/assets/js/4200b1a9.d764baec.js +++ /dev/null @@ -1 +0,0 @@ -"use strict";(self.webpackChunkfi=self.webpackChunkfi||[]).push([[866],{24612:e=>{e.exports=JSON.parse('{"blogPosts":[{"id":"/2023/08/02/copr","metadata":{"permalink":"/blog/2023/08/02/copr","editUrl":"https://github.com/mfocko/blog/tree/main/blog/2023-08-02-copr.md","source":"@site/blog/2023-08-02-copr.md","title":"How can Copr help with broken dependencies","description":"Copr comes to save you when maintainer doesn\'t care.","date":"2023-08-02T00:00:00.000Z","formattedDate":"August 2, 2023","tags":[{"label":"\ud83c\udfed","permalink":"/blog/tags/\ud83c\udfed"},{"label":"red-hat","permalink":"/blog/tags/red-hat"},{"label":"copr","permalink":"/blog/tags/copr"},{"label":"admin","permalink":"/blog/tags/admin"},{"label":"vps","permalink":"/blog/tags/vps"}],"readingTime":3.44,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. your opinionated admin","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"How can Copr help with broken dependencies","description":"Copr comes to save you when maintainer doesn\'t care.","date":"2023-08-02T00:00:00.000Z","authors":[{"key":"mf","title":"a.k.a. your opinionated admin"}],"tags":["\ud83c\udfed","red-hat","copr","admin","vps"]},"unlisted":false,"nextItem":{"title":"4th week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/4th-week"}},"content":"When you decide to run Fedora on your VPS, you might get screwed over by using\\nrandom repositories\u2026\\n\\n\x3c!--truncate--\x3e\\n\\nWhen I \u201creserved\u201d my VPS[^1] back in June \'20, I slapped Fedora on it without\\nthinking. I bet 99% of people would say that I\'m crazy for doing such thing[^2],\\n**BUT** I\'ve been using Fedora on my PCs for some time already and it felt very\\nstable and natural to just use, even for VPS.\\n\\nOne of the first things I\'ve done was setting up a mail server. You may guess\\nwhat\'s the fun part about having a mail server\u2026 Yes, it\'s all the spam you\\nreceive and only then you realize how much \u201ccrap\u201d gets filtered on free mail\\nservices. To battle this problem I chose to use\\n[rspamd](https://github.com/rspamd/rspamd) that had CentOS support, but someone\\nhad a [Copr](https://copr.fedorainfracloud.org/) repository that I used to\\ninstall it.\\n\\n## How does Copr repositories work?\\n\\nIf you have ever used Ubuntu, you might be familiar with the concept since it is\\nvery close to [PPAs](https://help.ubuntu.com/community/PPA).\\n\\ntl;dr of the whole process consists of\\n\\n1. enabling the Copr repository, and\\n2. installing the desired package.\\n\\nSo in shell you would do\\n\\n```\\n# dnf copr enable \u2039copr-repository\u203a\\n# dnf install \u2039package-from-the-repository\u203a\\n```\\n\\nAnd\u2026 that\'s it! Nothing else needed! Simple, right? And literally same process\\nas you would do for the PPA.\\n\\n:::tip AUR\\n\\nOn the other hand, if you are familiar with the archLinux, you definitely know\\nAUR and what it can do for you. Copr repository is pretty similar, but the\\npackages are prebuilt in Copr and Copr repositories can carry the required\\ndependencies for said packages, which simplifies the distribution, and can even\\nhelp with installing singular packages (when you just need the dependency, not\\neverything).\\n\\n:::\\n\\n## My issue\\n\\nNow you might wonder how would I use it on my VPS. It\'s rather simple, once in\\n6 months a new Fedora release comes out. And you need to upgrade to newer\\nrelease\u2026 You don\'t need to do it right away and for such setup it probably isn\'t\\neven recommended.\\n\\n:::tip\\n\\nFedora releases are supported for a year, i.e. they live 6 months till the next\\nrelease and then another 6 months till another release.\\n\\nSome people prefer to run one version \u201cbehind\u201d. If you ever decide to run it on\\nyour home server or in a similar setup, it might be a pretty good idea to\\nfollow. I\'m using the \u201clatest greatest\u201d, cause why not :smile:\\n\\nOne way or another, you still need to bump the release every six months, unless\\nyou\'d bump 2 releases at once every year, which would be a decision, since, at\\nleast I, cannot see any benefits in it\u2026 You don\'t go for \u201cstability\u201d, cause once\\na year you switch to the latest release and then, before you bump, you use one\\nyear old software, so you\'re not even using the latest.\\n\\n:::\\n\\nFast-forward 2 years in the future, new Fedora release came out (October \'22)\\nand I was doing an upgrade. Dependencies of the rspamd have been updated and\\nrspamd builds in Copr have failed and no one fixed it. Cool, so now I can\\nupgrade, but can either ignore the dependencies or uninstall the rspamd\u2026\\n\\n## How can Copr help?\\n\\nI have managed to find\\n[specfile](https://github.com/rspamd/rspamd/blob/master/rpm/rspamd.spec) for the\\nrspamd package that they use for CentOS. There were some files apart from the\\nspecfile, so I had to make an SRPM locally and then\u2026 I just uploaded the SRPM\\nto the Copr to\\n[build](https://copr.fedorainfracloud.org/coprs/mfocko/rspamd/build/5046567/)\\nan RPM.\\n\\nI have switched the previous Copr repository for rspamd with my own and happily\\nproceeded with the upgrade.\\n\\n## Conclusion\\n\\nCopr is heavily used for testing builds on the upstream with\\n[Packit](https://packit.dev). However, as you can see, it is possible to use it\\n**very well** for packaging your own stuff and avoiding issues (such as the one\\nI have described above), if need be.\\n\\n[^1]: [vpsFree.cz](https://vpsfree.cz)\\n[^2]:\\n Even though I\'ve been running archLinux on some Raspberry Pi\'s and also\\n on one of my \u201chome servers\u201d, before getting the VPS. You could say I like\\n to live on the edge\u2026"},{"id":"aoc-2022/4th-week","metadata":{"permalink":"/blog/aoc-2022/4th-week","editUrl":"https://github.com/mfocko/blog/tree/main/blog/aoc-2022/04-week-4.md","source":"@site/blog/aoc-2022/04-week-4.md","title":"4th week of Advent of Code \'22 in Rust","description":"Surviving fourth week in Rust.","date":"2023-07-07T15:14:00.000Z","formattedDate":"July 7, 2023","tags":[{"label":"advent-of-code","permalink":"/blog/tags/advent-of-code"},{"label":"advent-of-code-2022","permalink":"/blog/tags/advent-of-code-2022"},{"label":"rust","permalink":"/blog/tags/rust"}],"readingTime":15.175,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"4th week of Advent of Code \'22 in Rust","description":"Surviving fourth week in Rust.","date":"2023-07-07T15:14","slug":"aoc-2022/4th-week","authors":"mf","tags":["advent-of-code","advent-of-code-2022","rust"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"How can Copr help with broken dependencies","permalink":"/blog/2023/08/02/copr"},"nextItem":{"title":"3rd week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/3rd-week"}},"content":"Let\'s go through the fourth week of [_Advent of Code_] in Rust.\\n\\n\x3c!--truncate--\x3e\\n\\n## [Day 22: Monkey Map](https://adventofcode.com/2022/day/22)\\n\\n:::info tl;dr\\n\\nSimulating a movement on a 2D map with given instructions. Map becomes a cube in\\nthe 2nd part\u2026\\n\\n:::\\n\\n:::caution Rant\\n\\nThis was the most obnoxious problem of this year\u2026 and a lot of Rust issues have\\nbeen hit.\\n\\n:::\\n\\n### Solution\\n\\nIt seems like a very simple problem to solve, but with very obnoxious changes in\\nthe 2nd part and also it\'s relatively hard to decompose \xbbproperly\xab.\\n\\n#### Column iterator\\n\\nIn the first part of the problem it was needed to know the boundaries of each\\nrow and column, since I stored them in `Vec<Vec<char>>` and padded with spaces\\nto ensure I have a rectangular 2D \u201carray\u201d. However when you wanted to go through\\neach row and column to determine the boundaries, it was very easy to do for the\\nrows (cause each row is a `Vec` element), but not for the columns, since they\\nspan multiple rows.\\n\\nFor this use case I have implemented my own _column iterator_:\\n\\n```rust\\npub struct ColumnIterator<\'a, T> {\\n map: &\'a [Vec<T>],\\n column: usize,\\n\\n i: usize,\\n}\\n\\nimpl<\'a, T> ColumnIterator<\'a, T> {\\n pub fn new(map: &\'a [Vec<T>], column: usize) -> ColumnIterator<\'a, T> {\\n Self { map, column, i: 0 }\\n }\\n}\\n\\nimpl<\'a, T> Iterator for ColumnIterator<\'a, T> {\\n type Item = &\'a T;\\n\\n fn next(&mut self) -> Option<Self::Item> {\\n if self.i >= self.map.len() {\\n return None;\\n }\\n\\n self.i += 1;\\n Some(&self.map[self.i - 1][self.column])\\n }\\n}\\n```\\n\\nGiven this piece of an iterator, it is very easy to factor out the common\\nfunctionality between the rows and columns into:\\n\\n```rust\\nlet mut find_boundaries = |constructor: fn(usize) -> Orientation,\\n iterator: &mut dyn Iterator<Item = &char>,\\n upper_bound,\\n i| {\\n let mut first_non_empty = iterator.enumerate().skip_while(|&(_, &c)| c == \' \');\\n let start = first_non_empty.next().unwrap().0 as isize;\\n\\n let mut last_non_empty = first_non_empty.skip_while(|&(_, &c)| c != \' \');\\n let end = last_non_empty.next().unwrap_or((upper_bound, &\'_\')).0 as isize;\\n\\n boundaries.insert(constructor(i), start..end);\\n};\\n```\\n\\nAnd then use it as such:\\n\\n```rust\\n// construct all horizontal boundaries\\n(0..map.len()).for_each(|row| {\\n find_boundaries(\\n Orientation::horizontal,\\n &mut map[row].iter(),\\n map[row].len(),\\n row,\\n );\\n});\\n\\n// construct all vertical boundaries\\n(0..map[0].len()).for_each(|col| {\\n find_boundaries(\\n Orientation::vertical,\\n &mut ColumnIterator::new(&map, col),\\n map.len(),\\n col,\\n );\\n});\\n```\\n\\n#### Walking around the map\\n\\nOnce the 2nd part got introduced, you start to think about a way how not to\\ncopy-paste a lot of stuff (I haven\'t avoided it anyways\u2026). In this problem, I\'ve\\nchosen to introduce a trait (i.e. _interface_) for 2D and 3D walker.\\n\\n```rust\\ntrait Wrap: Clone {\\n type State;\\n\\n // simulation\\n fn is_blocked(&self) -> bool;\\n fn step(&mut self, steps: isize);\\n fn turn_left(&mut self);\\n fn turn_right(&mut self);\\n\\n // movement\\n fn next(&self) -> (Self::State, Direction);\\n\\n // final answer\\n fn answer(&self) -> Output;\\n}\\n```\\n\\nEach walker maintains its own state and also provides the functions that are\\nused during the simulation. The \u201cpromised\u201d methods are separated into:\\n\\n- _simulation_-related: that are used during the simulation from the `.fold()`\\n- _movement_-related: just a one method that holds most of the logic differences\\n between 2D and 3D\\n- _final answer_: which extracts the _proof of solution_ from the\\n implementation-specific walker\\n\\nBoth 2D and 3D versions borrow the original input and therefore you must\\nannotate the lifetime of it:\\n\\n```rust\\nstruct Wrap2D<\'a> {\\n input: &\'a Input,\\n position: Position,\\n direction: Direction,\\n}\\nimpl<\'a> Wrap2D<\'a> {\\n fn new(input: &\'a Input) -> Wrap2D<\'a> {\\n// \u2026\\n```\\n\\n#### Problems\\n\\nI have used a lot of closures for this problem and once I introduced a parameter\\nthat was of unknown type (apart from the fact it implements a specific trait), I\\ngot suggested a \u201cfix\u201d for the compilation error that resulted in something that\\nwas not possible to parse, cause it, more than likely, violated the grammar.\\n\\nIn a similar fashion, I have been suggested changes that led to a code that\\ndidn\'t make sense by just looking at it (there was no need to try the changes),\\nfor example one suggested change in the closure parameter caused disapperance of\\nthe parameter name. :smile:\\n\\n#### Clippy\\n\\nI have to admit that Clippy was rather helpful here, I\'ll include two examples\\nof rather smart suggestions.\\n\\nWhen writing the parsing for this problem, the first thing I have spotted on the\\n`char` was the `.is_digit()` function that takes a radix as a parameter. Clippy\\nnoticed that I use `radix = 10` and suggested switching to `.is_ascii_digit()`\\nthat does exactly the same thing:\\n\\n```diff\\n- .take_while(|c| c.is_digit(10))\\n+ .take_while(|c| c.is_ascii_digit())\\n```\\n\\nAnother useful suggestion appeared when working with the iterators and I wanted\\nto get the $n$-th element from it. You know the `.skip()`, you know the\\n`.next()`, just \u201cslap\u201d them together and we\'re done for :grin: Well, I got\\nsuggested to use `.nth()` that does exactly the combination of the two mentioned\\nmethods on iterators:\\n\\n```diff\\n- match it.clone().skip(skip).next().unwrap() {\\n+ match it.clone().nth(skip).unwrap() {\\n```\\n\\n## [Day 23: Unstable Diffusion](https://adventofcode.com/2022/day/23)\\n\\n:::info tl;dr\\n\\nSimulating movement of elves around with a set of specific rules.\\n\\n:::\\n\\n### Solution\\n\\nThere\'s not much to mention since it\'s just a cellular automaton simulation\\n(even though the AoC rules for cellular automatons usually get out of hand\\n:wink:).\\n\\nAlthough I had a need to determine boundaries of the elves\' positions and ended\\nup with a nasty DRY violation. Knowing that you you\'re looking for maximum and\\nminimum that are, of course, exactly the same except for initial values and\\ncomparators, it looks like a rather simple fix, but typing in Rust is something\\nelse, right? In the end I settled for a function that computes both boundaries\\nwithout any duplication while using a closure:\\n\\n```rust\\nfn get_bounds(positions: &Input) -> (Vector2D<isize>, Vector2D<isize>) {\\n let f = |init, cmp: &dyn Fn(isize, isize) -> isize| {\\n positions\\n .iter()\\n .fold(Vector2D::new(init, init), |acc, elf| {\\n Vector2D::new(cmp(acc.x(), elf.x()), cmp(acc.y(), elf.y()))\\n })\\n };\\n\\n (f(isize::MAX, &min::<isize>), f(isize::MIN, &max::<isize>))\\n}\\n```\\n\\nThis function returns a pair of 2D vectors that represent opposite points of the\\nbounding rectangle of all elves.\\n\\nYou might ask why would we need a closure and the answer is that `positions`\\ncannot be captured from within the nested function, only via closure. One more\\nfun fact on top of that is the type of the comparator\\n\\n```rust\\n&dyn Fn(isize, isize) -> isize\\n```\\n\\nOnce we remove the `dyn` keyword, compiler yells at us and also includes a way\\nhow to get a more thorough explanation of the error by running\\n\\n $ rustc --explain E0782\\n\\nwhich shows us\\n\\n Trait objects must include the `dyn` keyword.\\n\\n Erroneous code example:\\n\\n ```\\n trait Foo {}\\n fn test(arg: Box<Foo>) {} // error!\\n ```\\n\\n Trait objects are a way to call methods on types that are not known until\\n runtime but conform to some trait.\\n\\n Trait objects should be formed with `Box<dyn Foo>`, but in the code above\\n `dyn` is left off.\\n\\n This makes it harder to see that `arg` is a trait object and not a\\n simply a heap allocated type called `Foo`.\\n\\n To fix this issue, add `dyn` before the trait name.\\n\\n ```\\n trait Foo {}\\n fn test(arg: Box<dyn Foo>) {} // ok!\\n ```\\n\\n This used to be allowed before edition 2021, but is now an error.\\n\\n:::danger Rant\\n\\nNot all of the explanations are helpful though, in some cases they might be even\\nmore confusing than helpful, since they address _very simple_ use cases.\\n\\nAs you can see, even in this case there are two sides to the explanations:\\n\\n- it explains why you need to use `dyn`, but\\n- it still mentions that trait objects need to be heap-allocated via `Box<T>`\\n that, as you can see in my snippet, **does not** apply here :smile: IMO it\'s\\n caused by the fact that we are borrowing it and therefore we don\'t need to\\n care about the size or whereabouts of it.\\n\\n:::\\n\\n:::info C++ parallel\\n\\nIf you dive into the explanation above, you can notice that the `Box<dyn Trait>`\\npattern is very helpful for using types that are not known during compile-time.\\nYou would use a very similar approach in C++ when parsing some data structure\\nfrom input (let\'s say JSON for example).\\n\\nOn the other hand, in this case, it doesn\'t really make much sense, cause you\\ncan clearly see that the types **are known** during the compile-time, which in\\nC++ could be easily resolved by templating the helper function.\\n\\n:::\\n\\n## [Day 24: Blizzard Basin](https://adventofcode.com/2022/day/24)\\n\\n:::info tl;dr\\n\\nNavigating your way through a basin with series of blizzards that move around\\nyou as you move.\\n\\n:::\\n\\n:::caution\\n\\nIt\'s second to last day and I went \u201c_bonkers_\u201d on the Rust :smile: Proceed to\\nread _Solution_ part on your own risk.\\n\\n:::\\n\\n### Solution\\n\\nYou are given a map with blizzards all over the place and you\'re supposed to\\nfind the minimum time it requires you to walk through the basin without getting\\nin any of the blizzards.\\n\\n#### Breakdown\\n\\nRelatively simple, yet a bit annoying, approach can be taken. It\'s technically\\na shortest-path algorithm implementation with some relaxation restrictions and\\nbeing able to stay on one position for some time, so each _vertex_ of the graph\\nis determined by the position on the map and the _timestamp_. I have chosen to\\nuse `Vector3D<usize>`, since `x` and `y` attributes can be used for the position\\nand, well, let\'s use `z` for a timestamp, cause why not, right? :wink:\\n\\n#### Evaluating the blizzards\\n\\n:::caution\\n\\nI think that this is the most perverted abuse of the traits in the whole 4 weeks\\nof AoC in Rust\u2026\\n\\n:::\\n\\nThe blizzards move along their respective directions in time and loop around in\\ntheir respective row/column. Each vertex holds position **and** time, so we can\\n_just_ index the basin with the vertex itself, right? Yes, we can :smiling_imp:\\n\\n:::tip Fun fact\\n\\nWhile writing this part, I\'ve recognized unnecessary verbosity in the code and\\ncleaned it up a bit. The changed version is shown here and the original was just\\nmore verbose.\\n\\n:::\\n\\nI\'ll skip the boring parts of checking bounds and entry/exit of the basin :wink:\\nWe can easily calculate positions of the blizzards using a modular arithmetics:\\n\\n```rust\\nimpl Index<Position> for Basin {\\n type Output = char;\\n\\n fn index(&self, index: Position) -> &Self::Output {\\n // \u2039skipped boring parts\u203a\\n\\n // We need to account for the loops of the blizzards\\n let width = self.cols - 2;\\n let height = self.rows - 2;\\n\\n let blizzard_origin = |size, d, t, i| ((i - 1 + size + d * (t % size)) % size + 1) as usize;\\n [\\n (\\n index.y() as usize,\\n blizzard_origin(width, -1, index.z(), index.x()),\\n \'>\',\\n ),\\n (\\n index.y() as usize,\\n blizzard_origin(width, 1, index.z(), index.x()),\\n \'<\',\\n ),\\n (\\n blizzard_origin(height, -1, index.z(), index.y()),\\n index.x() as usize,\\n \'v\',\\n ),\\n (\\n blizzard_origin(height, 1, index.z(), index.y()),\\n index.x() as usize,\\n \'^\',\\n ),\\n ]\\n .iter()\\n .find_map(|&(y, x, direction)| {\\n if self.map[y][x] == direction {\\n Some(&self.map[y][x])\\n } else {\\n None\\n }\\n })\\n .unwrap_or(&\'.\')\\n }\\n}\\n```\\n\\nAs you can see, there is an expression for calculating the original position and\\nit\'s used multiple times, so why not take it out to a lambda, right? :wink:\\n\\nI couldn\'t get the `rustfmt` to format the `for`-loop nicely, so I\'ve just\\ndecided to go with iterating over an elements of a slice. I have used, once\\nagain, a combination of two functions (`find_map` in this case) to do 2 things\\nat once and at the end, if we haven\'t found any blizzard, we just return the\\nempty space.\\n\\nI think it\'s a very _nice_ (and naughty) way how to use the `Index` trait, don\'t\\nyou think?\\n\\n#### Shortest-path algorithm\\n\\nFor the shortest path you can choose and adjust any of the common shortest-path\\nalgorithms, in my case, I have decided to use [_A\\\\*_] instead of Dijkstra\'s\\nalgorithm, since it better reflects the _cost_ function.\\n\\n:::info Comparison of costs\\n\\nWith the Dijkstra\'s algorithm I would proceed with the `time` attribute used as\\na priority for the queue.\\n\\nWhereas with the _A\\\\*_, I have chosen to use both time and Manhattan distance\\nthat promotes vertices closer to the exit **and** with a minimum time taken.\\n\\n:::\\n\\nCost function is, of course, a closure :wink:\\n\\n```rust\\nlet cost = |p: Position| p.z() as usize + exit.y().abs_diff(p.y()) + exit.x().abs_diff(p.x());\\n```\\n\\nAnd also for checking the possible moves from the current vertex, I have\\nimplemented, yet another, closure that yields an iterator with the next moves:\\n\\n```rust\\nlet next_positions = |p| {\\n [(0, 0, 1), (0, -1, 1), (0, 1, 1), (-1, 0, 1), (1, 0, 1)]\\n .iter()\\n .filter_map(move |&(x, y, t)| {\\n let next_p = p + Vector3D::new(x, y, t);\\n\\n if basin[next_p] == \'.\' {\\n Some(next_p)\\n } else {\\n None\\n }\\n })\\n};\\n```\\n\\n#### Min-heap\\n\\nIn this case I had a need to use the priority queue taking the elements with the\\nlowest cost as the prioritized ones. Rust only offers you the [`BinaryHeap`] and\\nthat is a max-heap. One of the ways how to achieve a min-heap is to put the\\nelements in wrapped in a [`Reverse`] (as is even showed in the linked [docs of\\nthe `BinaryHeap`]). However the wrapping affects the type of the heap and also\\npopping the most prioritized elements yields values wrapped in the `Reverse`.\\n\\nFor this purpose I have just taken the max-heap and wrapped it as a whole in a\\nseparate structure providing just the desired methods:\\n\\n```rust\\nuse std::cmp::{Ord, Reverse};\\nuse std::collections::BinaryHeap;\\n\\npub struct MinHeap<T> {\\n heap: BinaryHeap<Reverse<T>>,\\n}\\n\\nimpl<T: Ord> MinHeap<T> {\\n pub fn new() -> MinHeap<T> {\\n MinHeap {\\n heap: BinaryHeap::new(),\\n }\\n }\\n\\n pub fn push(&mut self, item: T) {\\n self.heap.push(Reverse(item))\\n }\\n\\n pub fn pop(&mut self) -> Option<T> {\\n self.heap.pop().map(|Reverse(x)| x)\\n }\\n}\\n\\nimpl<T: Ord> Default for MinHeap<T> {\\n fn default() -> Self {\\n Self::new()\\n }\\n}\\n```\\n\\nRest is just the algorithm implementation which is not that interesting.\\n\\n## [Day 25: Full of Hot Air](https://adventofcode.com/2022/day/25)\\n\\n:::info tl;dr\\n\\nPlaying around with a numbers in a _special_ base.\\n\\n:::\\n\\nGetting flashbacks to the _IB111 Foundations of Programming_\u2026 Very nice \u201cproblem\u201d\\nwith a rather easy solution, as the last day always seems to be.\\n\\n### Solution\\n\\nImplementing 2 functions, converting from the _SNAFU base_ and back to the _SNAFU_\\n_base_ representation. Let\'s do a bit more though! I have implemented two functions:\\n\\n- `from_snafu`\\n- `to_snafu`\\n\\nNow it is apparent that all I do is number to string and string to number. Hmm\u2026\\nthat sounds familiar, doesn\'t it? Let\'s introduce a structure for the SNAFU numbers\\nand implement the traits that we need.\\n\\nLet\'s start with a structure:\\n\\n```rust\\n#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]\\nstruct SNAFU {\\n value: i64,\\n}\\n```\\n\\n#### Converting from `&str`\\n\\nWe will start by implementing the `FromStr` trait that will help us parse our input.\\nThis is rather simple, I can just take the `from_snafu` function, copy-paste it\\ninto the `from_str` method and the number I get will be wrapped in `Result` and\\n`SNAFU` structure.\\n\\n#### Converting to `String`\\n\\nThis is more fun. In some cases you need to implement only one trait and others\\nare automatically implemented using that one trait. In our case, if you look in\\nthe documentation, you can see that `ToString` trait is automatically implemented\\nfor any type that implements `Display` trait.\\n\\nLet\'s implement the `Display` trait then. We should be able to use the `to_snafu`\\nfunction and just take the `self.value` from the `SNAFU` structure.\\n\\nAnd for the convenience of tests, we can also implement a rather simple `From<i64>`\\ntrait for the `SNAFU`.\\n\\n#### Adjusting the code\\n\\nAfter those changes we need to adjust the code and tests.\\n\\nParsing of the input is very easy, before we have used the lines, now we parse\\neverything:\\n\\n```diff\\n fn parse_input<P: AsRef<Path>>(pathname: P) -> Input {\\n- file_to_lines(pathname)\\n+ file_to_structs(pathname)\\n }\\n```\\n\\nPart 1 needs to be adjusted a bit too:\\n\\n```diff\\n fn part_1(input: &Input) -> Output {\\n- to_snafu(input.iter().map(|s| from_snafu(s)).sum())\\n+ SNAFU::from(input.iter().map(|s| s.value).sum::<i64>()).to_string()\\n }\\n```\\n\\nYou can also see that it simplifies the meaning a bit and it is more explicit than\\nthe previous versions.\\n\\nAnd for the tests:\\n\\n```diff\\n #[test]\\n fn test_from() {\\n- for (n, s) in EXAMPLES.iter() {\\n- assert_eq!(from_snafu(s), *n);\\n+ for (&n, s) in EXAMPLES.iter() {\\n+ assert_eq!(s.parse::<SNAFU>().unwrap().value, n);\\n }\\n }\\n\\n #[test]\\n fn test_to() {\\n- for (n, s) in EXAMPLES.iter() {\\n- assert_eq!(to_snafu(*n), s.to_string());\\n+ for (&n, s) in EXAMPLES.iter() {\\n+ assert_eq!(SNAFU::from(n).to_string(), s.to_string());\\n }\\n```\\n\\n## Summary\\n\\nLet\'s wrap the whole thing up! Keeping in mind both AoC and the Rust\u2026\\n\\n![Finished advent calendar :smile:](/img/blog/aoc-2022/04-week-4/calendar.png)\\n\\n### Advent of Code\\n\\nThis year was quite fun, even though most of the solutions and posts came in\\nlater on (_cough_ in \'23 _cough_). Day 22 was the most obnoxious one\u2026 And also\\nit feels like I used priority queues and tree data structures **a lot** :eyes:\\n\\n### with Rust\\n\\nI must admit that a lot of compiler warnings and errors were very useful. Even\\nthough I still found some instances where they didn\'t help at all or cause even\\nworse issues than I had. Compilation times have been addressed with the caching.\\n\\nBuilding my first tree data structure in Rust has been a very \u201cinteresting\u201d\\njourney. Being able to write a more generic BFS algorithm that allows you to not\\nduplicate code while still mantaining the desired functionality contributes to\\na very readable code.\\n\\nI am definitely much more aware of the basic things that bloated Python is\\nmissing, yet Rust has them\u2026\\n\\nUsing explicit types and writing down placeholder functions with `todo!()`\\nmacros is very pleasant, since it allows you to easily navigate the type system\\nduring the development when you don\'t even need to be sure how are you going to\\nput the smaller pieces together.\\n\\nI have used a plethora of traits and also implemented some of them to either be\\nidiomatic, or exploit the syntactic sugar they offer. Deriving the default trait\\nimplementation is also very helpful in a lot of cases, e.g. debugging output,\\ncopying, equality comparison, etc.\\n\\nI confess to touching more \u201ccursed\u201d parts of the Rust, such as macros to\\ndeclutter the copy-paste for tests or writing my own structures that need to\\ncarry a lifetime for their own fields.\\n\\ntl;dr Relatively pleasant language until you hit brick wall :wink:\\n\\n---\\n\\nSee you next year! Maybe in Rust, maybe not :upside_down_face:\\n\\n[_advent of code_]: https://adventofcode.com\\n[_a\\\\*_]: https://en.wikipedia.org/wiki/A*_search_algorithm\\n[`binaryheap`]: https://doc.rust-lang.org/std/collections/struct.BinaryHeap.html\\n[`reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html\\n[docs of the `binaryheap`]: https://doc.rust-lang.org/std/collections/struct.BinaryHeap.html#min-heap"},{"id":"aoc-2022/3rd-week","metadata":{"permalink":"/blog/aoc-2022/3rd-week","editUrl":"https://github.com/mfocko/blog/tree/main/blog/aoc-2022/03-week-3.md","source":"@site/blog/aoc-2022/03-week-3.md","title":"3rd week of Advent of Code \'22 in Rust","description":"Surviving third week in Rust.","date":"2023-07-06T21:00:00.000Z","formattedDate":"July 6, 2023","tags":[{"label":"advent-of-code","permalink":"/blog/tags/advent-of-code"},{"label":"advent-of-code-2022","permalink":"/blog/tags/advent-of-code-2022"},{"label":"rust","permalink":"/blog/tags/rust"}],"readingTime":11.57,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"3rd week of Advent of Code \'22 in Rust","description":"Surviving third week in Rust.","date":"2023-07-06T21:00","slug":"aoc-2022/3rd-week","authors":"mf","tags":["advent-of-code","advent-of-code-2022","rust"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"4th week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/4th-week"},"nextItem":{"title":"Sort the matrix diagonally","permalink":"/blog/leetcode/sort-diagonally"}},"content":"Let\'s go through the third week of [_Advent of Code_] in Rust.\\n\\n\x3c!--truncate--\x3e\\n\\n## [Day 15: Beacon Exclusion Zone](https://adventofcode.com/2022/day/15)\\n\\n:::info tl;dr\\n\\nTriangulating a distress beacon based on the information from the sensors.\\n\\n:::\\n\\n### Solution\\n\\nRelatively easy thing to implement, no major Rust issues hit.\\n\\n## [Day 16: Proboscidea Volcanium](https://adventofcode.com/2022/day/16)\\n\\n:::info tl;dr\\n\\nFinding a max flow in a graph given some time constraints.\\n\\n:::\\n\\n### Solution\\n\\nI have used some interesting things to implement this and make it easier for me.\\n\\n#### Indexing in graph\\n\\nI have come across a situation where I needed to keep more information regarding\\nthe graph\u2026 In that case you can, of course, create a structure and keep it in,\\nbut once you have multiple members in the structure it gets harder to work with\\nsince you need to address the fields in the structure. When you work with graph,\\nyou frequently need to access the vertices and in this case it felt a lot easier\\nto implement the indexing in a graph, rather than explicitly access the\\nunderlying data structure.\\n\\nHere you can see a rather short snippet from the solution that allows you to\\n\u201cindex\u201d the graph:\\n\\n```rust\\nimpl Index<&str> for Graph {\\n type Output = Vertex;\\n\\n fn index(&self, index: &str) -> &Self::Output {\\n &self.g[index]\\n }\\n}\\n```\\n\\n#### Cartesian product\\n\\nDuring the implementation I had to utilize Floyd-Warshall algorithm for finding\\nthe shortest path between pairs of vertices and utilized the `iproduct!` macro\\nfrom the [`itertools`]. It is a very useful higher-order function that allows\\nyou to keep the nesting of the loops at a minimum level while still maintaining\\nthe same functionality.\\n\\n#### \u201cImplementing\u201d an iterator\\n\\nFor the second part, you get to split the work between 2 actors. That way you\\ncan achieve higher efficiency of the whole process that you\'re planning, but it\\nalso makes it harder to evaluate algorithmically, since you need to check the\\ndifferent ways the work can be split.\\n\\nBeing affected by _functional programming brain damage_:tm:, I have chosen to\\ndo this part by function that returns an iterator over the possible ways:\\n\\n```rust\\nfn pairings(\\n valves: &BTreeSet<String>,\\n) -> impl Iterator<Item = (BTreeSet<String>, BTreeSet<String>)> + \'_ {\\n let mapping = valves.iter().collect_vec();\\n\\n let max_mask = 1 << (valves.len() - 1);\\n\\n (0..max_mask).map(move |mask| {\\n let mut elephant = BTreeSet::new();\\n let mut human = BTreeSet::new();\\n\\n for (i, &v) in mapping.iter().enumerate() {\\n if (mask & (1 << i)) == 0 {\\n human.insert(v.clone());\\n } else {\\n elephant.insert(v.clone());\\n }\\n }\\n\\n (human, elephant)\\n })\\n}\\n```\\n\\n## [Day 17: Pyroclastic Flow](https://adventofcode.com/2022/day/17)\\n\\n:::info tl;dr\\n\\nSimulating an autonomous Tetris where pieces get affected by a series of jets of\\nhot gas.\\n\\n:::\\n\\n### Solution\\n\\nSimilarly to the previous day I have created some iterators :smile:\\n\\n#### Collision detection\\n\\nOnce you need to check for collisions it is very helpful to be able to just\\niterate through the positions that can actually collide with the wall or other\\npiece.\\n\\nTo get the desired behaviour, you can just compose few smaller functions:\\n\\n```rust\\nfn occupied(shape: &[Vec<char>]) -> impl Iterator<Item = Position> + \'_ {\\n shape.iter().enumerate().flat_map(|(y, row)| {\\n row.iter().enumerate().filter_map(move |(x, c)| {\\n if c == &\'#\' {\\n Some(Vector2D::new(x as isize, y as isize))\\n } else {\\n None\\n }\\n })\\n })\\n}\\n```\\n\\nIn the end, we get relative positions which we can adjust later when given the\\nspecific positions from iterator. You can see some interesting parts in this:\\n\\n- `.enumerate()` allows us to get both the indices (coordinates) and the line\\n or, later on, the character itself,\\n- `.flat_map()` flattens the iterator, i.e. when we return another iterator,\\n they just get chained instead of iterating over iterators (which sounds pretty\\n disturbing, doesn\'t it?),\\n- and finally `.filter_map()` which is pretty similar to the \u201cbasic\u201d `.map()`\\n with a one, key, difference that it expects the items of an iterator to be\\n mapped to an `Option<T>` from which it ignores nothing (as in `None` :wink:)\\n and also unwraps the values from `Some(\u2026)`.\\n\\n#### Infinite iterator\\n\\nIn the solution we cycle through both Tetris-like shapes that fall down and the\\njets that move our pieces around. Initially I have implemented my own infinite\\niterator that just yields the indices. It is a very simple, yet powerful, piece\\nof code:\\n\\n```rust\\nstruct InfiniteIndex {\\n size: usize,\\n i: usize,\\n}\\n\\nimpl InfiniteIndex {\\n fn new(size: usize) -> InfiniteIndex {\\n InfiniteIndex { size, i: size - 1 }\\n }\\n}\\n\\nimpl Iterator for InfiniteIndex {\\n type Item = usize;\\n\\n fn next(&mut self) -> Option<Self::Item> {\\n self.i = (self.i + 1) % self.size;\\n Some(self.i)\\n }\\n}\\n```\\n\\nHowever when I\'m looking at the code now, it doesn\'t really make much sense\u2026\\nGuess what, we can use a built-in function that is implemented on iterators for\\nthat! The function is called `.cycle()`\\n\\nOn the other hand, I am not going to switch to that function, since it would\\nintroduce an another myriad of issues caused by the fact that I create iterators\\nright away in the constructor of my structure and the iterators would borrow\\nboth the jets and shapes which would introduce a lifetime dependency into the\\nstructure.\\n\\n## [Day 18: Boiling Boulders](https://adventofcode.com/2022/day/18)\\n\\n:::info tl;dr\\n\\nLet\'s compute a surface area of some obsidian approximated via coordinates of\\ncubes.\\n\\n:::\\n\\n### Solution\\n\\nThis day is kinda interesting, because it shows how easily you can complicate the\\nproblem and also how much can you screw yourself over with the optimization and\\n\u201csmart\u201d approach.\\n\\nFor the first part you need to find the surface area of an obsidian that is\\napproximated by cubes. Now, that is a very easy thing to do, just keep the track\\nof already added cubes, and check if the newly added cube touches any face of any\\nother cube. Simple, and with a `BTreeSet` relatively efficient way to do it.\\n\\nHowever the second part lets you on a secret that there may be some surface area\\nfrom the \u201cinside\u201d too and you want to know only the one from the outside of the\\nobsidian. I have seen some solutions later, but if you check your data, you might\\nnotice that the bounding box of all the cubes isn\'t that big at all. Therefore I\\nchose to pre-construct the box beforehand, fill in the cubes and then just run a\\nBFS turning all the lava on the outside into the air. Now you just need to check\\ncubes and count how many of their faces touch the air.\\n\\n## [Day 19: Not Enough Minerals](https://adventofcode.com/2022/day/19)\\n\\n:::info tl;dr\\n\\nFinding out the best strategy for building robots to collect geodes.\\n\\n:::\\n\\n### Solution\\n\\nNot much interesting stuff to mention apart from the suggestion to never believe\\nthat the default implementation given by `derive` macro is what you want, it\\ndoesn\'t have to be. :smile:\\n\\n## [Day 20: Grove Positioning System](https://adventofcode.com/2022/day/20)\\n\\n:::info tl;dr\\n\\nShuffling around the _circular linked list_ to find the coordinates.\\n\\n:::\\n\\nNow, small rant for this day is in place. They\'ve never mentioned that coordinates\\ncan repeat and therefore the values are non-unique. This is something that did\\nnot happen in the given sample, but was present in the user input. It took \xbba lot\xab\\nto realize that this is the issue.\\n\\n### Solution\\n\\nI have tried implementing a circular linked list for this\u2026 and I have failed\\nmiserably. To be fair, I still have no clue why. It was \u201cfun\u201d to play around with\\nthe `Rc<RefCell<T>>`. In the end I failed on _wrong answer_. I have also encountered\\na rather interesting issue with `.borrow_mut()` method being used on `Rc<RefCell<T>>`.\\n\\n#### `.borrow_mut()`\\n\\nConsider the following snippet of the code (taken from the documentation):\\n\\n```rust\\nuse std::cell::{RefCell, RefMut};\\nuse std::collections::HashMap;\\nuse std::rc::Rc;\\n// use std::borrow::BorrowMut;\\n\\nfn main() {\\n let shared_map: Rc<RefCell<_>> = Rc::new(RefCell::new(HashMap::new()));\\n // Create a new block to limit the scope of the dynamic borrow\\n {\\n let mut map: RefMut<_> = shared_map.borrow_mut();\\n map.insert(\\"africa\\", 92388);\\n map.insert(\\"kyoto\\", 11837);\\n map.insert(\\"piccadilly\\", 11826);\\n map.insert(\\"marbles\\", 38);\\n }\\n\\n // Note that if we had not let the previous borrow of the cache fall out\\n // of scope then the subsequent borrow would cause a dynamic thread panic.\\n // This is the major hazard of using `RefCell`.\\n let total: i32 = shared_map.borrow().values().sum();\\n println!(\\"{total}\\");\\n}\\n```\\n\\nWe allocate a hash map on the heap and then in the inner block, we borrow it as\\na mutable reference, so that we can use it.\\n\\n:::note\\n\\nIt is a very primitive example for `Rc<RefCell<T>>` and mutable borrow.\\n\\n:::\\n\\nIf you uncomment the 4th line with `use std::borrow::BorrowMut;`, you cannot\\ncompile the code anymore, because of\\n\\n```\\n Compiling playground v0.0.1 (/playground)\\nerror[E0308]: mismatched types\\n --\x3e src/main.rs:10:34\\n |\\n10 | let mut map: RefMut<_> = shared_map.borrow_mut();\\n | --------- ^^^^^^^^^^^^^^^^^^^^^^^ expected struct `RefMut`, found mutable reference\\n | |\\n | expected due to this\\n |\\n = note: expected struct `RefMut<\'_, _>`\\n found mutable reference `&mut Rc<RefCell<HashMap<_, _>>>`\\n\\nerror[E0599]: no method named `insert` found for struct `RefMut<\'_, _>` in the current scope\\n --\x3e src/main.rs:11:13\\n |\\n11 | map.insert(\\"africa\\", 92388);\\n | ^^^^^^ method not found in `RefMut<\'_, _>`\\n\\nerror[E0599]: no method named `insert` found for struct `RefMut<\'_, _>` in the current scope\\n --\x3e src/main.rs:12:13\\n |\\n12 | map.insert(\\"kyoto\\", 11837);\\n | ^^^^^^ method not found in `RefMut<\'_, _>`\\n\\nerror[E0599]: no method named `insert` found for struct `RefMut<\'_, _>` in the current scope\\n --\x3e src/main.rs:13:13\\n |\\n13 | map.insert(\\"piccadilly\\", 11826);\\n | ^^^^^^ method not found in `RefMut<\'_, _>`\\n\\nerror[E0599]: no method named `insert` found for struct `RefMut<\'_, _>` in the current scope\\n --\x3e src/main.rs:14:13\\n |\\n14 | map.insert(\\"marbles\\", 38);\\n | ^^^^^^ method not found in `RefMut<\'_, _>`\\n\\nSome errors have detailed explanations: E0308, E0599.\\nFor more information about an error, try `rustc --explain E0308`.\\nerror: could not compile `playground` due to 5 previous errors\\n```\\n\\nIt might seem **a bit** ridiculous. However, I got to a point where the compiler\\nsuggested `use std::borrow::BorrowMut;` and it resulted in breaking parts of the\\ncode that worked previously. I think it may be a good idea to go over what is\\nhappening here.\\n\\n##### `.borrow_mut()` on `Rc<RefCell<T>>`\\n\\nLet\'s consider a variable `x` of type `Rc<RefCell<T>>`. What happens when you\\ncall `.borrow_mut()` on it? We can look at the `Rc` type, and\u2026 hang on! There is\\nneither `.borrow_mut()` method or `BorrowMut` trait implemented. How can we do it\\nthen?\\n\\nLet\'s go further and we can see that `RefCell<T>` implements a `.borrow_mut()`\\nmethod. OK, but how can we call it on the `Rc<T>`? Easily! `Rc<T>` implements\\n`Deref<T>` and therefore you can call methods on `Rc<T>` objects as if they were\\n`T` objects. If we read on _`Deref` coercion_, we can see the following:\\n\\n> If `T` implements `Deref<Target = U>`, \u2026:\\n>\\n> - \u2026\\n> - `T` implicitly implements all the (immutable) methods of the type `U`.\\n\\nWhat is the requirement for the `.borrow_mut()` on `RefCell<T>`? Well, it needs\\n`&self`, so the `Deref` implements the `.borrow_mut()` for the `Rc<RefCell<T>>`.\\n\\n##### `BorrowMut` trait\\n\\nI have not been able to find a lot on this trait. My guess is that it provides a\\nmethod instead of a syntactic sugar (`&mut x`) for the mutable borrow. And also\\nit provides default implementations for the types:\\n\\n```rust\\nimpl BorrowMut<str> for String\\n\\nimpl<T> BorrowMut<T> for &mut T\\nwhere\\n T: ?Sized,\\n\\nimpl<T> BorrowMut<T> for T\\nwhere\\n T: ?Sized,\\n\\nimpl<T, A> BorrowMut<[T]> for Vec<T, A>\\nwhere\\n A: Allocator,\\n\\nimpl<T, A> BorrowMut<T> for Box<T, A>\\nwhere\\n A: Allocator,\\n T: ?Sized,\\n\\nimpl<T, const N: usize> BorrowMut<[T]> for [T; N]\\n```\\n\\n##### Conflict\\n\\nNow the question is why did it break the code\u2026 My first take was that the type\\n`Rc<RefCell<T>>` has some _specialized_ implementation of the `.borrow_mut()` and\\nthe `use` overrides it with the default, which is true **in a sense**. However\\nthere is no _specialized_ implementation. Let\'s have a look at the trait and the\\ntype signature on the `RefCell<T>`:\\n\\n```rust\\n// trait\\npub trait BorrowMut<Borrowed>: Borrow<Borrowed>\\nwhere\\n Borrowed: ?Sized,\\n{\\n fn borrow_mut(&mut self) -> &mut Borrowed;\\n}\\n\\n// \u2039RefCell<T>.borrow_mut()\u203a type signature\\npub fn borrow_mut(&self) -> RefMut<\'_, T>\\n```\\n\\nI think that we can definitely agree on the fact that `RefMut<\'_, T>` is not the\\n`RefCell<T>`.\\n\\n**In my opinion**, `RefCell<T>` implements a **separate** `.borrow_mut()` rather\\nthan implementing the interface, because it **cannot** satisfy the type requirements\\nof the trait.\\n\\n:::caution\\n\\nI wonder how are we expected to deal with this conflict, if and when, we need\\nboth the `.borrow_mut()` of the trait and `.borrow_mut()` of the `RefCell<T>`.\\n\\n:::\\n\\n:::tip Fun fact\\n\\nI was suggested by the compiler to do `use std::borrow::BorrowMut;` and break the\\ncode.\\n\\nSo much for the _almighty_ and _helpful_ compiler\u2026\\n\\n:::\\n\\n## [Day 21: Monkey Math](https://adventofcode.com/2022/day/21)\\n\\n:::info tl;dr\\n\\nComputing an expression tree and then also finding ideal value for a node.\\n\\n:::\\n\\n### Solution\\n\\nRelatively simple, until you get to the 2nd part where you start to practice\\na lot of the copy-paste. I have managed to sneak some perverted stuff in there\\nthough :) Let\'s go through the details.\\n\\n#### `Default` trait\\n\\nFor the first time and twice I had a need to have a default value for my types,\\nenumerations in this case. Rust offers a very nice trait[^1] that is described\\nas:\\n\\n> A trait for giving a type a useful default value.\\n\\nI guess it sums it up nicely. The more interesting part about this is the fact\\nthat you can use the _macro machinery_ to save yourself some typing. If you have\\nenumeration of which the default value doesn\'t bear any parameter, you can just\\ndo[^2]:\\n\\n```rust\\n#[derive(Default)]\\nenum Color {\\n #[default]\\n White,\\n Gray,\\n Black,\\n}\\n```\\n\\n#### Abusing negation\\n\\nIf you want to use a _unary minus_ operator on your own type, you can implement\\na `Neg` trait[^3]. I was dealing with a binary tree and needed a way how to look\\nat the other side, so I have just implemented the negation for flipping between\\nleft and right :smile:\\n\\n[^1]: [`Default`](https://doc.rust-lang.org/std/default/trait.Default.html) docs\\n[^2]: Pardon my example from the graph algorithms ;)\\n[^3]: [`Neg`](https://doc.rust-lang.org/std/ops/trait.Neg.html) docs\\n\\n[_advent of code_]: https://adventofcode.com\\n[`itertools`]: https://crates.io/crates/itertools\\n[this reddit post and the comment]: https://www.reddit.com/r/adventofcode/comments/zb98pn/comment/iyq0ono"},{"id":"leetcode/sort-diagonally","metadata":{"permalink":"/blog/leetcode/sort-diagonally","editUrl":"https://github.com/mfocko/blog/tree/main/blog/leetcode/sort-matrix-diagonally.md","source":"@site/blog/leetcode/sort-matrix-diagonally.md","title":"Sort the matrix diagonally","description":"Compiler assisted development.","date":"2023-03-04T23:15:00.000Z","formattedDate":"March 4, 2023","tags":[{"label":"cpp","permalink":"/blog/tags/cpp"},{"label":"leetcode","permalink":"/blog/tags/leetcode"},{"label":"iterators","permalink":"/blog/tags/iterators"}],"readingTime":16.99,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"Sort the matrix diagonally","description":"Compiler assisted development.","date":"2023-03-04T23:15","slug":"leetcode/sort-diagonally","authors":"mf","tags":["cpp","leetcode","iterators"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"3rd week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/3rd-week"},"nextItem":{"title":"2nd week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/2nd-week"}},"content":"Let\'s try to solve one of the LeetCode challenges in easy and hard mode at the\\nsame time.\\n\\n\x3c!--truncate--\x3e\\n\\n- Link to the problem: https://leetcode.com/problems/sort-the-matrix-diagonally/\\n\\n## Problem description\\n\\nA **matrix diagonal** is a diagonal line of cells starting from some cell in\\neither the topmost row or leftmost column and going in the bottom-right direction\\nuntil reaching the matrix\'s end. For example, the **matrix diagonal** starting\\nfrom `mat[2][0]`, where `mat` is a `6 x 3` matrix, includes cells `mat[2][0]`,\\n`mat[3][1]`, and `mat[4][2]`.\\n\\nGiven an `m x n` matrix `mat` of integers, sort each matrix diagonal in ascending\\norder and return the resulting matrix.\\n\\n### Example\\n\\n![Image describing the problem](https://assets.leetcode.com/uploads/2020/01/21/1482_example_1_2.png)\\n\\n## Skeleton and initial adjustments\\n\\nWe are given the following skeleton for the C++ and the given challenge:\\n\\n```cpp\\nclass Solution {\\npublic:\\n vector<vector<int>> diagonalSort(vector<vector<int>>& mat) {\\n\\n }\\n};\\n```\\n\\nThe task is to sort the passed matrix diagonally and then return it. First of all,\\nI don\'t like to solve this in a web browser, so we\'ll need to adjust it accordingly\\nfor running it locally. We\'ll start by including the `vector` header and using\\nfully-qualified namespaces[^1] and also adding few tests:\\n\\n```cpp\\n#include <cassert>\\n#include <vector>\\n\\nusing matrix = std::vector<std::vector<int>>;\\n\\nclass Solution {\\npublic:\\n matrix diagonalSort(matrix& mat)\\n {\\n }\\n};\\n\\nstatic void test_case_1()\\n{\\n // Input: mat = [[3,3,1,1],[2,2,1,2],[1,1,1,2]]\\n // Output: [[1,1,1,1],[1,2,2,2],[1,2,3,3]]\\n\\n Solution s;\\n assert((s.diagonalSort(std::vector { std::vector { 3, 3, 1, 1 },\\n std::vector { 2, 2, 1, 2 },\\n std::vector { 1, 1, 1, 2 } })\\n == std::vector { std::vector { 1, 1, 1, 1 },\\n std::vector { 1, 2, 2, 2 },\\n std::vector { 1, 2, 3, 3 } }));\\n}\\n\\nstatic void test_case_2()\\n{\\n // Input: mat =\\n // [[11,25,66,1,69,7],[23,55,17,45,15,52],[75,31,36,44,58,8],[22,27,33,25,68,4],[84,28,14,11,5,50]]\\n // Output:\\n // [[5,17,4,1,52,7],[11,11,25,45,8,69],[14,23,25,44,58,15],[22,27,31,36,50,66],[84,28,75,33,55,68]]\\n\\n Solution s;\\n assert((s.diagonalSort(std::vector { std::vector { 11, 25, 66, 1, 69, 7 },\\n std::vector { 23, 55, 17, 45, 15, 52 },\\n std::vector { 75, 31, 36, 44, 58, 8 },\\n std::vector { 22, 27, 33, 25, 68, 4 },\\n std::vector { 84, 28, 14, 11, 5, 50 } })\\n == std::vector { std::vector { 5, 17, 4, 1, 52, 7 },\\n std::vector { 11, 11, 25, 45, 8, 69 },\\n std::vector { 14, 23, 25, 44, 58, 15 },\\n std::vector { 22, 27, 31, 36, 50, 66 },\\n std::vector { 84, 28, 75, 33, 55, 68 } }));\\n}\\n\\nint main()\\n{\\n test_case_1();\\n test_case_2();\\n\\n return 0;\\n}\\n```\\n\\nWe need to return the matrix, but we\'re given a reference to the input matrix. We\\ncan easily abuse the C++ here and just switch the reference to value, this way\\nthe matrix will be copied when passed to the function, we can sort the copy and\\njust return it back. And we also get yelled by the compiler for the fact that the\\nmethod doesn\'t return anything yet, so to make it \u201cshut up\u201d we will just return\\nthe input for now:\\n\\n```diff\\n- matrix diagonalSort(matrix& mat)\\n+ matrix diagonalSort(matrix mat)\\n {\\n+ return mat;\\n }\\n```\\n\\nNow, we get the copy and we\'re good to go.\\n\\n## Na\xefve solution\\n\\nAs you may know, C++ offers a plethora of functions that can be used to your\\nadvantage, given that you know how to \u201cbend\u201d the data structures accordingly.\\n\\nWhat does that mean for us? Well, we have an `std::sort`, we can use it, right?\\nLet\'s have a look at it:\\n\\n```cpp\\ntemplate< class RandomIt >\\nvoid sort( RandomIt first, RandomIt last );\\n```\\n\\nThis overload is more than we need. What does it do? It just sorts the elements\\nin the range `[first, last)` using `operator<` on them. We can\'t sort the whole\\nmatrix using this, but\u2026 we can sort just \xbbone\xab diagonal without doing much work\\non our end.\\n\\nWhat is the `RandomIt` type though? If we look more into the documentation, we\\ncan easily find the requirements for it and also learn that it\'s a _random access_\\n_iterator_ and allows swapping its values at the same time.\\n\\n:::tip Random access iterator\\n\\nWhat is the _random access iterator_ though? We can find it in a documentation\\nand see the following description:\\n\\n> A **LegacyRandomAccessIterator** is a [LegacyBidirectionalIterator](https://en.cppreference.com/w/cpp/named_req/BidirectionalIterator)\\n> that can be moved to point to any element in constant time.\\n\\nAfter that we can see all the requirements for it being listed. I don\'t feel like\\nreading them right now, so we will just use it and see where the compilation blows\\nup, i.e. \u201c_compiler-assisted development_\u201d[^2] if you will ;)\\n\\n:::\\n\\nNow we know that we can use `std::sort` to sort the diagonal itself, but we also\\nneed to get the diagonals somehow. I\'m rather lazy, so I\'ll just delegate it to\\nsomeone else[^3]. And that way we get\\n\\n```cpp\\nmatrix diagonalSort(matrix mat)\\n{\\n // we iterate over the diagonals\\n for (auto d : diagonals(mat)) {\\n // and we sort each diagonal\\n std::sort(d.begin(), d.end());\\n }\\n\\n // we take the matrix by copy, so we can sort in-situ and return the copy\\n // that we sorted\\n return mat;\\n}\\n```\\n\\nThis solution looks very simple, doesn\'t it? Well, cause it is.\\nLet\'s try compiling it:\\n\\n```\\nmatrix-sort.cpp:11:23: error: use of undeclared identifier \'diagonals\' [clang-diagnostic-error]\\n for (auto d : diagonals(mat)) {\\n ^\\nFound compiler error(s).\\nmake: *** [makefile:14: tidy] Error 1\\n```\\n\\nOK, seems about right. We haven\'t implemented the `diagonals` yet. And based on\\nwhat we\'ve written so far, we need a function or a class `diagonals` that will\\ngive us the diagonals we need.\\n\\n## Implementing the `diagonals`\\n\\nCool, so we need the function that will let us go through each and every diagonal\\nin our matrix. We use the _for-range_ loop, so whatever we get back from the\\n`diagonals` must support `.begin()` and `.end()`. Since I am a masochist, we will\\ndo such functionality for a matrix of any type, not just the `int` from the challenge.\\n\\nAs I said, we need to be able to\\n\\n- construct the object\\n- get the beginning\\n- get the end (the \u201csentinel\u201d)\\n\\n```cpp\\ntemplate <typename T>\\nclass diagonals {\\n using matrix_t = std::vector<std::vector<T>>;\\n\\n matrix_t& _matrix;\\n\\npublic:\\n diagonals(matrix_t& m)\\n : _matrix(m)\\n {\\n }\\n diagonals_iter begin()\\n {\\n /* TODO */\\n }\\n diagonals_iter end()\\n {\\n /* TODO */\\n }\\n};\\n```\\n\\nNow we have a `diagonals` that we can use to go through the diagonals. We haven\'t\\nimplemented the core of it yet. Let\'s go through what we have for now.\\n\\nWe have a templated class with templated `T` that is used as a placeholder for any\\ntype we would store in the matrix. Because I\'m lazy, I have defined the `matrix_t`\\ntype that is a \u201cshortcut\u201d for `std::vector<std::vector<T>>`, so I don\'t have to\\ntype it out all the time. Of course, we need to store the matrix, we are given,\\nas a private attribute. And then just have the constructor and the 2 methods we\\nneed for the _for-range_.\\n\\n### Iterating over diagonals\\n\\nNow that we have an object that will allow us to iterate through the diagonals,\\nwe need to implement the iterating itself. We need to go through all of them, so\\nwe have multiple options how to do so. I have decided to start from the \u201cmain\u201d\\ndiagonal that starts at `(0, 0)` index and then proceed with the diagonals starting\\nin the first row, followed by the rest of the diagonals in the first column.\\n\\nWe need to be able to tell that we\'ve iterated through all of them, and also we\\nneed to know which diagonal is next. For that purpose we will pass the indices\\nof the first cell on the diagonal. That way we can always tell how to move forward.\\n\\nWe will start by updating the `begin` and `end` to reflect our choice accordingly.\\n\\n```cpp\\ndiagonals_iter begin() { return diagonals_iter { _matrix, 0, 0 }; }\\ndiagonals_iter end() { return diagonals_iter { _matrix, 0, _matrix.size() }; }\\n```\\n\\nFor the `begin` we return the first diagonal that starts at `(0, 0)`. And because\\nwe have decided to do the diagonals in the first column at the end, the first\\ndiagonal that is not a valid one is the one at `(0, height)`. Apart from the\\nindices, we also need to pass reference to the matrix itself.\\n\\n:::note\\n\\nYou may have noticed that we also include the diagonals that have length 1,\\nspecifically the ones at `(0, height - 1)` and `(width - 1, 0)`. We are implementing\\nan iterator that **should not** care about the way it\'s being used. Therefore, we\\ndon\'t care about the fact they don\'t need to be sorted.\\n\\n:::\\n\\nCool, let\'s leave the iterator itself to someone else, right?[^4]\\n\\n### Implementing the iterator over diagonals\\n\\nWe can start with a simple skeleton based on the information that we pass from\\nthe `diagonals`. Also to utilize the `matrix_t` and also contain implementation\\ndetails hidden away, we will put this code into the `diagonals` class.\\n\\n```cpp\\nclass diagonals_iter {\\n matrix_t& m;\\n std::size_t x;\\n std::size_t y;\\n\\npublic:\\n diagonals_iter(matrix_t& matrix, std::size_t x, std::size_t y)\\n : m(matrix)\\n , x(x)\\n , y(y)\\n {\\n }\\n};\\n```\\n\\nIn this case we will be implementing a \u201csimple\u201d forward iterator, so we don\'t\\nneed to implement a lot. Notably it will be:\\n\\n- inequality operator (we need to know when we reach the end and have nothing to\\n iterate over)\\n- preincrementation operator (we need to be able to move around the iterable)\\n- dereference operator (we need to be able to retrieve the objects we iterate\\n over)\\n\\n```cpp\\nclass diagonals_iter {\\n matrix_t& m;\\n std::size_t x;\\n std::size_t y;\\n\\npublic:\\n diagonals_iter(matrix_t& matrix, std::size_t x, std::size_t y)\\n : m(matrix)\\n , x(x)\\n , y(y)\\n {\\n }\\n\\n bool operator!=(const diagonals_iter& rhs) const\\n {\\n // iterators are not equal if they reference different matrices, or\\n // their positions differ\\n return m != rhs.m || x != rhs.x || y != rhs.y;\\n }\\n\\n diagonals_iter& operator++()\\n {\\n if (y != 0) {\\n // iterating through diagonals down the first column\\n y++;\\n return *this;\\n }\\n\\n // iterating the diagonals along the first row\\n x++;\\n if (x == m.front().size()) {\\n // switching to diagonals in the first column\\n x = 0;\\n y++;\\n }\\n\\n return *this;\\n }\\n\\n diagonal<T> operator*() const { return diagonal { m, x, y }; }\\n};\\n```\\n\\nLet\'s go one-by-one. Inequality operator is rather simple, just compare iterator\'s\\nattributes field-by-field. If you think about it, checking inequality of two 2D\\nvectors may be a bit inefficient, therefore, we can swap around and check it as\\na last thing.\\n\\n```diff\\n- return m != rhs.m || x != rhs.x || y != rhs.y;\\n+ return x != rhs.x || y != rhs.y || m != rhs.m;\\n```\\n\\nPreincrementation is where the magic happens. If you have a better look, you can\\nsee two branches of this operation:\\n\\n1. When `y != 0` (we\'re iterating over the diagonals in the first column)\\n In this case, we just bump the row and we\'re done.\\n2. When `y == 0` (we\'re iterating over the diagonals in the first row)\\n In this case, we bump the column and check if we haven\'t gotten out of bounds,\\n i.e. the end of the first row. If we get out of the bounds, we\'re continuing\\n with the second diagonal in the first column.\\n\\nDereferencing the iterator must \u201cyield\u201d something. In our case it will be the\\ndiagonal that we want to sort. For sorting we need just the iterators that can\\nmove around said diagonal. The simplest thing, we can do, is to delegate it to\\nsomething else. In our case it will be a class called `diagonal`.\\n\\n## Implementing the `diagonal` itself\\n\\nAfter implementing the iterator over diagonals, we know that all we need to describe\\na diagonal is the matrix itself and the \u201cstart\u201d of the diagonal (row and column).\\nAnd we also know that the diagonal must provide some iterators for the `std::sort`\\nfunction. We can start with the following skeleton:\\n\\n```cpp\\ntemplate <typename T>\\nclass diagonal {\\n using matrix_t = std::vector<std::vector<T>>;\\n\\n matrix_t& matrix;\\n std::size_t x;\\n std::size_t y;\\n\\npublic:\\n diagonal(matrix_t& matrix, std::size_t x, std::size_t y)\\n : matrix(matrix)\\n , x(x)\\n , y(y)\\n {\\n }\\n\\n diagonal_iter begin() const { return diagonal_iter { matrix, x, y }; }\\n\\n diagonal_iter end() const\\n {\\n auto max_x = matrix[y].size();\\n auto max_y = matrix.size();\\n\\n // we need to find the distance in which we get out of bounds (either in\\n // column or row)\\n auto steps = std::min(max_x - x, max_y - y);\\n\\n return diagonal_iter { matrix, x + steps, y + steps };\\n }\\n};\\n```\\n\\nInitialization is rather simple, we just \u201ckeep\u201d the stuff we get, `begin` is the\\nsimplest, we just delegate.\\n\\nIn case of the `end`, it gets more complicated. We need to know where is the \u201cend\u201d\\nof the diagonal. Since `end` should point to the first element \u201cafter\u201d the iterable,\\nwe know that it\'s the first position of the iterator where either `y` becomes\\n`matrix.size()` or `x` becomes `matrix[y].size()`. Also we are moving along diagonal,\\nduh, therefore we can deduce the first \u201cposition\u201d afterwards by minimal amount of\\nsteps to get out of the any column or row, hence `std::min(max_x - x, max_y - y)`.\\nFinal position is then computed simply by adding the steps to the beginning of\\nthe diagonal.\\n\\nNow we just need to finish the iterator for the diagonal itself and we\'re done.\\n\\n### Implementing `diagonal_iter`\\n\\nThis part is the hardest from all we need to do. It\'s because of the requirements\\nof the `std::sort` that requires us to implement a _random access iterator_. I have\\nbriefly described it above, and \u201cin a nutshell\u201d it means that we need to implement\\nan iterator that can move in constant time along the diagonal in any amount of\\nsteps.\\n\\nLet\'s go through all of the functionality that our iterator needs to support to\\nbe used in `std::sort`. We need the usual operations like:\\n\\n- equality/inequality\\n- incrementation\\n- dereferencing\\n\\nWe will also add all the types that our iterator uses with the category of the\\niterator, i.e. what interface it supports:\\n\\n```cpp\\nclass diagonal_iter {\\n // we need to keep reference to the matrix itself\\n matrix_t& m;\\n\\n // we need to be able to tell our current position\\n std::size_t x;\\n std::size_t y;\\n\\npublic:\\n using difference_type = std::ptrdiff_t;\\n using value_type = T;\\n using pointer = T*;\\n using reference = T&;\\n using iterator_category = std::random_access_iterator_tag;\\n\\n diagonal_iter(matrix_t& matrix,\\n std::size_t x,\\n std::size_t y)\\n : m(matrix)\\n , x(x)\\n , y(y)\\n {\\n }\\n\\n bool operator==(const diagonal_iter& rhs) const\\n {\\n return x == rhs.x && y == rhs.y && m == rhs.m;\\n }\\n\\n diagonal_iter& operator++()\\n {\\n // we are moving along the diagonal, so we increment both \u2039x\u203a and \u2039y\u203a at\\n // the same time\\n x++;\\n y++;\\n return *this;\\n }\\n\\n reference operator*() const { return m[y][x]; }\\n};\\n```\\n\\nThis is pretty similar to the previous iterator, but now we need to implement the\\nremaining requirements of the _random access iterator_. Let\'s see what those are:\\n\\n- decrementation - cause we need to be able to move backwards too, since _random _\\n _access iterator_ extends the interface of _bidirectional iterator_\\n- moving the iterator in either direction by steps given as an integer\\n- being able to tell the distance between two iterators\\n- define an ordering on the iterators\\n\\nLet\'s fill them in:\\n\\n```cpp\\nclass diagonal_iter {\\n // we need to keep reference to the matrix itself\\n matrix_t& m;\\n\\n // we need to be able to tell our current position\\n std::size_t x;\\n std::size_t y;\\n\\npublic:\\n using difference_type = std::ptrdiff_t;\\n using value_type = T;\\n using pointer = T*;\\n using reference = T&;\\n using iterator_category = std::random_access_iterator_tag;\\n\\n diagonal_iter(matrix_t& matrix,\\n std::size_t x,\\n std::size_t y)\\n : m(matrix)\\n , x(x)\\n , y(y)\\n {\\n }\\n\\n bool operator==(const diagonal_iter& rhs) const\\n {\\n return x == rhs.x && y == rhs.y && m == rhs.m;\\n }\\n\\n diagonal_iter& operator++()\\n {\\n // we are moving along the diagonal, so we increment both \u2039x\u203a and \u2039y\u203a at\\n // the same time\\n x++;\\n y++;\\n return *this;\\n }\\n\\n reference operator*() const { return m[y][x]; }\\n\\n // exactly opposite to the incrementation\\n diagonal_iter operator--()\\n {\\n x--;\\n y--;\\n return *this;\\n }\\n\\n // moving \u2039n\u203a steps back is same as calling decrementation \u2039n\u203a-times, so we\\n // can just return a new iterator and subtract \u2039n\u203a from both coordinates in\\n // the matrix\\n diagonal_iter operator-(difference_type n) const\\n {\\n return diagonal_iter { m, x - n, y - n };\\n }\\n\\n // here we assume that we are given two iterators on the same diagonal\\n difference_type operator-(const diagonal_iter& rhs) const\\n {\\n assert(m == rhs.m);\\n return x - rhs.x;\\n }\\n\\n // counterpart of moving \u2039n\u203a steps backwards\\n diagonal_iter operator+(difference_type n) const\\n {\\n return diagonal_iter { m, x + n, y + n };\\n }\\n\\n // we compare the coordinates, and also assume that those 2 iterators are\\n // lying on the same diagonal\\n bool operator<(const diagonal_iter& rhs) const\\n {\\n assert(m == rhs.m);\\n return x < rhs.x && y < rhs.y;\\n }\\n};\\n```\\n\\nAt this point we could probably try and compile it, right? If we do so, we will\\nget yelled at by a compiler for the following reasons:\\n\\n```\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1792:11: error: object of type \'diagonal<int>::diagonal_iter\' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]\\n __last = __next;\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1817:11: note: in instantiation of function template specialization \'std::__unguarded_linear_insert<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Val_less_iter>\' requested here\\n std::__unguarded_linear_insert(__i,\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1849:9: note: in instantiation of function template specialization \'std::__insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__insertion_sort(__first, __first + int(_S_threshold), __comp);\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1940:9: note: in instantiation of function template specialization \'std::__final_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__final_insertion_sort(__first, __last, __comp);\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization \'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());\\n ^\\nmatrix-sort.cpp:161:18: note: in instantiation of function template specialization \'std::sort<diagonal<int>::diagonal_iter>\' requested here\\n std::sort(d.begin(), d.end());\\n ^\\nmatrix-sort.cpp:17:19: note: copy assignment operator of \'diagonal_iter\' is implicitly deleted because field \'m\' is of reference type \'diagonal<int>::matrix_t &\' (aka \'vector<std::vector<int>> &\')\\n matrix_t& m;\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1830:2: error: no matching function for call to \'__unguarded_linear_insert\' [clang-diagnostic-error]\\n std::__unguarded_linear_insert(__i,\\n ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1850:9: note: in instantiation of function template specialization \'std::__unguarded_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__unguarded_insertion_sort(__first + int(_S_threshold), __last,\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1940:9: note: in instantiation of function template specialization \'std::__final_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__final_insertion_sort(__first, __last, __comp);\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization \'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());\\n ^\\nmatrix-sort.cpp:161:18: note: in instantiation of function template specialization \'std::sort<diagonal<int>::diagonal_iter>\' requested here\\n std::sort(d.begin(), d.end());\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1782:5: note: candidate template ignored: substitution failure [with _RandomAccessIterator = diagonal<int>::diagonal_iter, _Compare = __gnu_cxx::__ops::_Val_less_iter]\\n __unguarded_linear_insert(_RandomAccessIterator __last,\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1923:11: error: object of type \'diagonal<int>::diagonal_iter\' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]\\n __last = __cut;\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1937:9: note: in instantiation of function template specialization \'std::__introsort_loop<diagonal<int>::diagonal_iter, long, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__introsort_loop(__first, __last,\\n ^\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization \'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>\' requested here\\n std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());\\n ^\\nmatrix-sort.cpp:161:18: note: in instantiation of function template specialization \'std::sort<diagonal<int>::diagonal_iter>\' requested here\\n std::sort(d.begin(), d.end());\\n ^\\nmatrix-sort.cpp:17:19: note: copy assignment operator of \'diagonal_iter\' is implicitly deleted because field \'m\' is of reference type \'diagonal<int>::matrix_t &\' (aka \'vector<std::vector<int>> &\')\\n matrix_t& m;\\n ^\\n```\\n\\nThat\'s a lot of noise, isn\'t it? Let\'s focus on the important parts:\\n\\n```\\n/usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1792:11: error: object of type \'diagonal<int>::diagonal_iter\' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]\\n\u2026\\nmatrix-sort.cpp:17:19: note: copy assignment operator of \'diagonal_iter\' is implicitly deleted because field \'m\' is of reference type \'diagonal<int>::matrix_t &\' (aka \'vector<std::vector<int>> &\')\\n matrix_t& m;\\n ^\\n```\\n\\nAh! We have a reference in our iterator, and this prevents us from having a copy\\nassignment operator (that is used \u201csomewhere\u201d in the sorting algorithm). Well\u2026\\nLet\'s just wrap it!\\n\\n```diff\\n# we need to keep a different type than reference\\n- matrix_t& m;\\n+ std::reference_wrapper<matrix_t> m;\\n\\n# in comparison we need to get the reference out of the wrapper first\\n- return x == rhs.x && y == rhs.y && m == rhs.m;\\n+ return x == rhs.x && y == rhs.y && m.get() == rhs.m.get();\\n\\n# same when we return a reference to the \u201ccell\u201d in the matrix\\n- reference operator*() const { return m[y][x]; }\\n+ reference operator*() const { return m.get()[y][x]; }\\n\\n# and finally in the assertions that we set for the \u201cdistance\u201d and \u201cless than\u201d\\n- assert(m == rhs.m);\\n+ assert(m.get() == rhs.m.get());\\n```\\n\\nWe\'re done now! We have written an iterator over diagonals for a 2D `vector`. You can have a look at the final result [here](pathname:///files/blog/leetcode/sort-matrix-diagonally/matrix-sort.cpp).\\n\\n[^1]: just because I\'m used to it and don\'t care about your opinion ;)\\n[^2]: exercise at your own risk\\n[^3]: me in 5 minutes in fact, but don\'t make me scared\\n[^4]: me in the next section\u2026"},{"id":"aoc-2022/2nd-week","metadata":{"permalink":"/blog/aoc-2022/2nd-week","editUrl":"https://github.com/mfocko/blog/tree/main/blog/aoc-2022/02-week-2.md","source":"@site/blog/aoc-2022/02-week-2.md","title":"2nd week of Advent of Code \'22 in Rust","description":"Surviving second week in Rust.","date":"2022-12-25T23:15:00.000Z","formattedDate":"December 25, 2022","tags":[{"label":"advent-of-code","permalink":"/blog/tags/advent-of-code"},{"label":"advent-of-code-2022","permalink":"/blog/tags/advent-of-code-2022"},{"label":"rust","permalink":"/blog/tags/rust"}],"readingTime":20.875,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"2nd week of Advent of Code \'22 in Rust","description":"Surviving second week in Rust.","date":"2022-12-25T23:15","slug":"aoc-2022/2nd-week","authors":"mf","tags":["advent-of-code","advent-of-code-2022","rust"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"Sort the matrix diagonally","permalink":"/blog/leetcode/sort-diagonally"},"nextItem":{"title":"1st week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/1st-week"}},"content":"Let\'s go through the second week of [_Advent of Code_] in Rust.\\n\\n\x3c!--truncate--\x3e\\n\\n## [Day 8: Treetop Tree House](https://adventofcode.com/2022/day/8)\\n\\n:::info tl;dr\\n\\nWe get a forest and we want to know how many trees are visible from the outside.\\nApart from that we want to find the best view.\\n\\n:::\\n\\nNothing interesting. We are moving around 2D map though. And indexing can get a\\nbit painful when doing so, let\'s refactor it a bit ;) During the preparation for\\nthe AoC, I have written `Vector2D` and now it\'s time to extend it with indexing\\nof `Vec` of `Vec`s. In my solution I was manipulating with indices in the following\\nway:\\n\\n- swapping them\\n- checking whether they are correct indices for the `Vec<Vec<T>>`\\n- indexing `Vec<Vec<T>>` with them\\n\\n:::caution\\n\\nI\'m getting familiar with Rust and starting to \u201cabuse\u201d it\u2026 While doing so, I\'m\\nalso uncovering some \u201cfeatures\u201d that I don\'t really like. Therefore I will mark\\nall of my rants with _thicc_ **\xab\u21af\xbb** mark and will try to \u201clock\u201d them into their\\nown \u201cbox of hell\u201d.\\n\\n:::\\n\\n#### Swapping indices\\n\\nRelatively simple implementation, just take the values, swap them and return new\\nvector.\\n\\n```rust\\nimpl<T: Copy> Vector2D<T> {\\n pub fn swap(&self) -> Self {\\n Self {\\n x: self.y,\\n y: self.x,\\n }\\n }\\n}\\n```\\n\\nPretty straight-forward implementation, but let\'s talk about the `T: Copy`. We\\nneed to use it, since we are returning a **new** vector, with swapped **values**.\\nIf we had values that cannot be copied, the only thing we could do, would be a\\nvector of references (and it would also introduce a lifetime, to which we\'ll get\\nlater on). This is pretty similar with the operations on sets from the first week.\\n\\n#### Indexing `Vec`\\n\\nI will start with the indexing, cause bound-checking is a bit more\u2026 complicated\\nthan I would like to.\\n\\n```rust\\npub fn index<\'a, T, U>(v: &\'a [Vec<U>], idx: &Vector2D<T>) -> &\'a U\\nwhere\\n usize: TryFrom<T>,\\n <usize as TryFrom<T>>::Error: Debug,\\n T: Copy,\\n{\\n let (x, y): (usize, usize) = (idx.x.try_into().unwrap(), idx.y.try_into().unwrap());\\n &v[y][x]\\n}\\n```\\n\\nLet\'s talk about this mess\u2026 Body of the function is probably the most easy part\\nand should not be hard to understand, we just take the `x` and `y` and convert\\nthem both to `usize` type that can be used later on for indexing.\\n\\nThe type signature of the function is where the fun is at :wink: We are trying\\nto convert unknown type to `usize`, so we must bound the `T` as a type that can\\nbe converted to `usize`, that\'s how we got `usize: TryFrom<T>` which basically\\nsays that `usize` must implement `TryFrom<T>` trait and therefore allows us to\\nconvert the indices to actual `usize` indices. Using `.unwrap()` also forces us\\nto bound the error that can occur when converting `T` into `usize`, that\'s how\\nwe get `<usize as TryFrom<T>>::Error: Debug` which loosely means\\n\\n> error during conversion of `T` into `usize` must implement `Debug`,\\n> i.e. can be printed in some way or other\\n\\n`T: Copy` is required by `.try_into()` which takes `T` by-value.\\n\\nAnd now we are left only with the first line of the definition.\\n\\n:::note\\n\\nSkilled Rustaceans might notice that this implementation is rather flaky and can\\nbreak in multiple places at once. I\'ll get back to it\u2026\\n\\n:::\\n\\nLet\'s split it in multiple parts:\\n\\n- `v: &\'a [Vec<U>]` represents the 2D `Vec`, we are indexing, `Vec` implements\\n `Slice` trait and _clippy_ recommends using `&[T]` to `&Vec<T>`, exact details\\n are unknown to me\\n- `idx: &Vector2D<T>` represents the _indices_ which we use, we take them by\\n reference to avoid an unnecessary copy\\n- `-> &\'a U` means that we are returning a _reference_ to some value of type `U`.\\n Now the question is what does the `\'a` mean, we can also see it as a generic\\n type declared along `T` and `U`. And the answer is _relatively_ simple, `\'a`\\n represents a _lifetime_. We take the `v` by a reference and return a reference,\\n borrow checker validates all of the _borrows_ (or references), so we need to\\n specify that our returned value has _the same lifetime_ as the vector we have\\n taken by a reference, i.e. returned reference must live at least as long as the\\n `v`. This way we can \u201cbe sure\u201d that the returned reference is valid.\\n\\n##### Issues\\n\\nFirst issue that our implementation has is the fact that we cannot get a mutable\\nreference out of that function. This could be easily resolved by introducing new\\nfunction, e.g. `index_mut`. Which I have actually done while writing this part:\\n\\n```rust\\npub fn index_mut<\'a, T, U>(v: &\'a mut [Vec<U>], idx: &Vector2D<T>) -> &\'a mut U\\nwhere\\n usize: TryFrom<T>,\\n <usize as TryFrom<T>>::Error: Debug,\\n T: Copy,\\n{\\n let (x, y): (usize, usize) = (idx.x.try_into().unwrap(), idx.y.try_into().unwrap());\\n &mut v[y][x]\\n}\\n```\\n\\n:::caution **\xab\u21af\xbb** Why can\'t we use one function?\\n\\nWhen we consider a `Vec<T>`, we don\'t need to consider containers as `T`, Rust\\nimplements indexing as traits `Index<T>` and `IndexMut<T>` that do the dirty work\\nbehind syntactic sugar of `container[idx]`.\\n\\nHowever, implementing of traits is not allowed for _external_ types, i.e. types\\nthat you haven\'t defined yourself. This means that you can implement indexing\\nover containers that you have implemented yourself, but you cannot use your own\\ntypes for indexing \u201cbuilt-in\u201d types.\\n\\nAnother part of this rabbit hole is trait `SliceIndex<T>` that is of a relevance\\nbecause of\\n\\n```rust\\nimpl<T, I> Index<I> for [T]\\nwhere\\n I: SliceIndex<[T]>\\n\\nimpl<T, I, A> Index<I> for Vec<T, A>\\nwhere\\n I: SliceIndex<[T]>,\\n A: Allocator\\n\\nimpl<T, I, const N: usize> Index<I> for [T; N]\\nwhere\\n [T]: Index<I>\\n```\\n\\nIn other words, if your type implements `SliceIndex<T>` trait, it can be used\\nfor indexing. As of now, this trait has all of its required methods experimental\\nand is marked as `unsafe`.\\n\\n:::\\n\\nAnother problem is a requirement for indexing either `[Vec<T>]` or `Vec<Vec<T>>`.\\nThis requirement could be countered by removing inner type `Vec<T>` and constraining\\nit by a trait `Index` (or `IndexMut` respectively) in a following way\\n\\n```rust\\npub fn index<\'a, C, T>(v: &\'a [C], idx: &Vector2D<T>) -> &\'a C::Output\\nwhere\\n usize: TryFrom<T>,\\n <usize as TryFrom<T>>::Error: Debug,\\n T: Copy,\\n C: Index<usize>\\n{\\n let (x, y): (usize, usize) = (idx.x.try_into().unwrap(), idx.y.try_into().unwrap());\\n &v[y][x]\\n}\\n```\\n\\nGiven this, we can also give a more meaningful typename for indexing type, such\\nas `I`.\\n\\n#### Checking bounds\\n\\nNow we can get to the boundary checks, it is very similar, but a more\u2026 dirty.\\nFirst approach that came up was to convert the indices in `Vector2D` to `usize`,\\nbut when you add the indices up, e.g. when checking the neighbors, you can end\\nup with negative values which, unlike in C++, causes an error (instead of underflow\\nthat you can use to your advantage; you can easily guess how).\\n\\nSo how can we approach this then? Well\u2026 we will convert the bounds instead of\\nthe indices and that lead us to:\\n\\n```rust\\npub fn in_range<T, U>(v: &[Vec<U>], idx: &Vector2D<T>) -> bool\\nwhere\\n usize: TryInto<T>,\\n <usize as TryInto<T>>::Error: Debug,\\n T: PartialOrd + Copy,\\n{\\n idx.y >= 0.try_into().unwrap()\\n && idx.y < v.len().try_into().unwrap()\\n && idx.x >= 0.try_into().unwrap()\\n && idx.x\\n < v[TryInto::<usize>::try_into(idx.y).unwrap()]\\n .len()\\n .try_into()\\n .unwrap()\\n}\\n```\\n\\nYou can tell that it\'s definitely a shitty code. Let\'s improve it now! We will\\nget back to the original idea, but do it better. We know that we cannot convert\\nnegative values into `usize`, **but** we also know that conversion like that\\nreturns a `Result<T, E>` which we can use to our advantage.\\n\\n```rust\\npub fn in_range<T, U>(v: &[Vec<U>], idx: &Vector2D<T>) -> bool\\nwhere\\n T: Copy,\\n usize: TryFrom<T>,\\n{\\n usize::try_from(idx.y)\\n .and_then(|y| usize::try_from(idx.x).map(|x| y < v.len() && x < v[y].len()))\\n .unwrap_or(false)\\n}\\n```\\n\\n`Result<T, E>` is a type similar to `Either` in Haskell and it allows us to chain\\nmultiple operations on correct results or propagate the original error without\\ndoing anything. Let\'s dissect it one-by-one.\\n\\n`try_from` is a method implemented in `TryFrom` trait, that allows you to convert\\ntypes and either successfully convert them or fail (with a reasonable error). This\\nmethod returns `Result<T, E>`.\\n\\nWe call `and_then` on that _result_, let\'s have a look at the type signature of\\n`and_then`, IMO it explains more than enough:\\n\\n```rust\\npub fn and_then<U, F>(self, op: F) -> Result<U, E>\\nwhere\\n F: FnOnce(T) -> Result<U, E>\\n```\\n\\nOK\u2026 So it takes the result and a function and returns another result with\\ndifferent value and different error. However we can see that the function, which\\nrepresents an operation on a result, takes just the value, i.e. it doesn\'t care\\nabout any previous error. To make it short:\\n\\n> `and_then` allows us to run an operation, which can fail, on the correct result\\n\\nWe parsed a `y` index and now we try to convert the `x` index with `try_from`\\nagain, but on that result we use `map` rather than `and_then`, why would that be?\\n\\n```rust\\npub fn map<U, F>(self, op: F) -> Result<U, E>\\nwhere\\n F: FnOnce(T) -> U\\n```\\n\\nHuh\u2026 `map` performs an operation that **cannot** fail. And finally we use\\n`unwrap_or` which takes the value from result, or in case of an error returns the\\ndefault that we define.\\n\\nHow does this work then? If `y` is negative, the conversion fails and the error\\npropagates all the way to `unwrap_or`, if `y` can be a correct `usize` value, then\\nwe do the same with `x`. If `x` is negative, we propagate the error as with `y`,\\nand if it\'s not, then we check whether it exceeds the higher bounds or not.\\n\\n### Solution\\n\\nRelatively simple, you just need follow the rules and not get too smart, otherwise\\nit will get back at you.\\n\\n## [Day 9: Rope Bridge](https://adventofcode.com/2022/day/9)\\n\\n:::info tl;dr\\n\\nWe get a rope with knots and we want to track how many different positions are\\nvisited with the rope\'s tail.\\n\\n:::\\n\\nBy this day, I have come to a conclusion that current skeleton for each day\\ngenerates a lot of boilerplate. And even though it can be easily copied, it\'s\\njust a waste of space and unnecessary code. Let\'s \u201csimplify\u201d this (on one end\\nwhile creating monster on the other end). I\'ve gone through what we need in the\\npreparations for the AoC. Let\'s sum up our requirements:\\n\\n- parsing\\n- part 1 & 2\\n- running on sample / input\\n- tests\\n\\nParsing and implementation of both parts is code that changes each day and we\\ncannot do anything about it. However running and testing can be simplified!\\n\\nLet\'s introduce and export a new module `solution` that will take care of all of\\nthis. We will start by introducing a trait for each day.\\n\\n```rust\\npub trait Solution<Input, Output: Display> {\\n fn parse_input<P: AsRef<Path>>(pathname: P) -> Input;\\n\\n fn part_1(input: &Input) -> Output;\\n fn part_2(input: &Input) -> Output;\\n}\\n```\\n\\nThis does a lot of work for us already, we have defined a trait and for each day\\nwe will create a structure representing a specific day. That structure will also\\nimplement the `Solution` trait.\\n\\nNow we need to get rid of the boilerplate, we can\'t get rid of the `main` function,\\nbut we can at least move out the functionality.\\n\\n```rust\\nfn run(type_of_input: &str) -> Result<()>\\nwhere\\n Self: Sized,\\n{\\n tracing_subscriber::fmt()\\n .with_env_filter(EnvFilter::from_default_env())\\n .with_target(false)\\n .with_file(true)\\n .with_line_number(true)\\n .without_time()\\n .compact()\\n .init();\\n color_eyre::install()?;\\n\\n let input = Self::parse_input(format!(\\"{}s/{}.txt\\", type_of_input, Self::day()));\\n\\n info!(\\"Part 1: {}\\", Self::part_1(&input));\\n info!(\\"Part 2: {}\\", Self::part_2(&input));\\n\\n Ok(())\\n}\\n\\nfn main() -> Result<()>\\nwhere\\n Self: Sized,\\n{\\n Self::run(\\"input\\")\\n}\\n```\\n\\nThis is all part of the `Solution` trait, which can implement methods while being\\ndependent on what is provided by the implementing types. In this case, we just\\nneed to bound the `Output` type to implement `Display` that is necessary for the\\n`info!` and format string there.\\n\\nNow we can get to first of the nasty things we are going to do\u2026 And it is the\\n`day()` method that you can see being used when constructing path to the input\\nfile. That method will generate a name of the file, e.g. `day01` and we know that\\nwe can _somehow_ deduce it from the structure name, given we name it reasonably.\\n\\n```rust\\nfn day() -> String {\\n let mut day = String::from(type_name::<Self>().split(\\"::\\").next().unwrap());\\n day.make_ascii_lowercase();\\n\\n day.to_string()\\n}\\n```\\n\\n:::caution `type_name`\\n\\nThis feature is still experimental and considered to be internal, it is not\\nadvised to use it any production code.\\n\\n:::\\n\\nAnd now we can get to the nastiest stuff :weary: We will **generate** the tests!\\n\\nWe want to be able to generate tests for sample input in a following way:\\n\\n```rust\\ntest_sample!(day_01, Day01, 42, 69);\\n```\\n\\nThere\'s not much we can do, so we will write a macro to generate the tests for us.\\n\\n```rust\\n#[macro_export]\\nmacro_rules! test_sample {\\n ($mod_name:ident, $day_struct:tt, $part_1:expr, $part_2:expr) => {\\n #[cfg(test)]\\n mod $mod_name {\\n use super::*;\\n\\n #[test]\\n fn test_part_1() {\\n let sample =\\n $day_struct::parse_input(&format!(\\"samples/{}.txt\\", $day_struct::day()));\\n assert_eq!($day_struct::part_1(&sample), $part_1);\\n }\\n\\n #[test]\\n fn test_part_2() {\\n let sample =\\n $day_struct::parse_input(&format!(\\"samples/{}.txt\\", $day_struct::day()));\\n assert_eq!($day_struct::part_2(&sample), $part_2);\\n }\\n }\\n };\\n}\\n```\\n\\nWe have used it in a similar way as macros in C/C++, one of the things that we\\ncan use to our advantage is defining \u201ctype\u201d of the parameters for the macro. All\\nparameters have their name prefixed with `$` sign and you can define various \u201cforms\u201d\\nof your macro. Let\'s go through it!\\n\\nWe have following parameters:\\n\\n- `$mod_name` which represents the name for the module with tests, it is typed\\n with `ident` which means that we want a valid identifier to be passed in.\\n- `$day_struct` represents the structure that will be used for tests, it is typed\\n with `tt` which represents a _token tree_, in our case it is a type.\\n- `$part_X` represents the expected output for the `X`th part and is of type `expr`\\n which literally means an _expression_.\\n\\nApart from that we need to use `#[macro_export]` to mark the macro as exported\\nfor usage outside of the module. Now our skeleton looks like:\\n\\n```rust\\nuse aoc_2022::*;\\n\\ntype Input = String;\\ntype Output = String;\\n\\nstruct DayXX;\\nimpl Solution<Input, Output> for DayXX {\\n fn parse_input<P: AsRef<Path>>(pathname: P) -> Input {\\n file_to_string(pathname)\\n }\\n\\n fn part_1(input: &Input) -> Output {\\n todo!()\\n }\\n\\n fn part_2(input: &Input) -> Output {\\n todo!()\\n }\\n}\\n\\nfn main() -> Result<()> {\\n // DayXX::run(\\"sample\\")\\n DayXX::main()\\n}\\n\\n// test_sample!(day_XX, DayXX, , );\\n```\\n\\n### Solution\\n\\nNot much to talk about, it is relatively easy to simulate.\\n\\n## [Day 10: Cathode-Ray Tube](https://adventofcode.com/2022/day/10)\\n\\n:::info tl;dr\\n\\nEmulating basic arithmetic operations on a CPU and drawing on CRT based on the\\nCPU\'s accumulator.\\n\\n:::\\n\\nIn this day I have discovered an issue with my design of the `Solution` trait.\\nAnd the issue is caused by different types of `Output` for the part 1 and part 2.\\n\\nProblem is relatively simple and consists of simulating a CPU, I have approached\\nit in a following way:\\n\\n```rust\\nfn evaluate_instructions(instructions: &[Instruction], mut out: Output) -> Output {\\n instructions\\n .iter()\\n .fold(State::new(), |state, instruction| {\\n state.execute(instruction, &mut out)\\n });\\n\\n out\\n}\\n```\\n\\nWe just take the instructions, we have some state of the CPU and we execute the\\ninstructions one-by-one. Perfect usage of the `fold` (or `reduce` as you may know\\nit from other languages).\\n\\nYou can also see that we have an `Output` type, so the question is how can we fix\\nthat problem. And the answer is very simple and _functional_. Rust allows you to\\nhave an `enumeration` that can _bear_ some other values apart from the type itself.\\n\\n:::tip\\n\\nWe could\'ve seen something like this with the `Result<T, E>` type that can be\\ndefined as\\n\\n```rust\\nenum Result<T, E> {\\n Ok(T),\\n Err(E)\\n}\\n```\\n\\n###### What does that mean though?\\n\\nWhen we have an `Ok` value, it has the result itself, and when we get an `Err`\\nvalue, it has the error. This also allows us to handle _results_ in a rather\\npretty way:\\n\\n```rust\\nmatch do_something(x) {\\n Ok(y) => {\\n println!(\\"SUCCESS: {}\\", y);\\n },\\n Err(y) => {\\n eprintln!(\\"ERROR: {}\\", y);\\n }\\n}\\n```\\n\\n:::\\n\\nMy solution has a following outline:\\n\\n```rust\\nfn execute(&self, i: &Instruction, output: &mut Output) -> State {\\n // execute the instruction\\n\\n // collect results if necessary\\n match output {\\n Output::Part1(x) => self.execute_part_1(y, x),\\n Output::Part2(x) => self.execute_part_2(y, x),\\n }\\n\\n // return the obtained state\\n new_state\\n}\\n```\\n\\nYou might think that it\'s a perfectly reasonable thing to do. Yes, **but** notice\\nthat the `match` statement doesn\'t _collect_ the changes in any way and also we\\npass `output` by `&mut`, so it is shared across each _iteration_ of the `fold`.\\n\\nThe dirty and ingenious thing is that `x`s are passed by `&mut` too and therefore\\nthey are directly modified by the helper functions. To sum it up and let it sit\\n\\n> We are **collecting** the result **into** an **enumeration** that is **shared**\\n> across **all** iterations of `fold`.\\n\\n### Solution\\n\\nSimilar to _Day 9_, but there are some technical details that can get you.\\n\\n## [Day 11: Monkey in the Middle](https://adventofcode.com/2022/day/11)\\n\\n:::info tl;dr\\n\\nSimulation of monkeys throwing stuff around and measuring your stress levels\\nwhile your stuff is being passed around.\\n\\n:::\\n\\nI think I decided to use regular expressions here for the first time, cause\\nparsing the input was a pain.\\n\\nAlso I didn\'t expect to implement Euclidean algorithm in Rust\u2026\\n\\n### Solution\\n\\nAgain, we\'re just running a simulation. Though I must admit it was very easy to\\nmake a small technical mistakes that could affect the final results very late.\\n\\n## [Day 12: Hill Climbing Algorithm](https://adventofcode.com/2022/day/12)\\n\\n:::info tl;dr\\n\\nFinding shortest path up the hill and also shortest path down to the ground while\\nalso rolling down the hill\u2026\\n\\n:::\\n\\nAs I have said in the _tl;dr_, we are looking for the shortest path, but the start\\nand goal differ for the part 1 and 2. So I have decided to refactor my solution\\nto a BFS algorithm that takes necessary parameters via functions:\\n\\n```rust\\nfn bfs<F, G>(\\n graph: &[Vec<char>], start: &Position, has_edge: F, is_target: G\\n) -> Option<usize>\\nwhere\\n F: Fn(&[Vec<char>], &Position, &Position) -> bool,\\n G: Fn(&[Vec<char>], &Position) -> bool\\n```\\n\\nWe pass the initial vertex from the caller and everything else is left to the BFS\\nalgorithm, based on the `has_edge` and `is_target` functions.\\n\\nThis was easy! And that is not very usual in Rust once you want to pass around\\nfunctions. :eyes:\\n\\n### Solution\\n\\nLooking for the shortest path\u2026 Must be Dijkstra, right? **Nope!** Half of the\\nReddit got jebaited though. In all fairness, nothing stops you from implementing\\nthe Dijkstra\'s algorithm for finding the shortest path, **but** if you know that\\nall connected vertices are in a unit (actually $d = 1$) distance from each other,\\nthen you know that running Dijkstra is equivalent to running BFS, only with worse\\ntime complexity, because of the priority heap instead of the queue.\\n\\n## [Day 13: Distress Signal](https://adventofcode.com/2022/day/13)\\n\\n:::info tl;dr\\n\\nProcessing packets with structured data from the distress signal.\\n\\n:::\\n\\nYou can implement a lot of traits if you want to. It is _imperative_ to implement\\nordering on the packets. I had a typo, so I also proceeded to implement a `Display`\\ntrait for debugging purposes:\\n\\n```rust\\nimpl Display for Packet {\\n fn fmt(&self, f: &mut std::fmt::Formatter<\'_>) -> std::fmt::Result {\\n match self {\\n Packet::Integer(x) => write!(f, \\"{x}\\"),\\n Packet::List(lst) => write!(f, \\"[{}]\\", lst.iter().map(|p| format!(\\"{p}\\")).join(\\",\\")),\\n }\\n }\\n}\\n```\\n\\n### Solution\\n\\nA lot of technical details\u2026 Parsing is nasty too\u2026\\n\\n## [Day 14: Regolith Reservoir](https://adventofcode.com/2022/day/14)\\n\\n:::info tl;dr\\n\\nLet\'s simulate falling sand grain-by-grain.\\n\\n:::\\n\\nAgain, both parts are relatively similar with minimal changes, so it is a good\\nidea to refactor it a bit. Similar approach to the [BFS above]. Also this is the\\nfirst day where I ran into efficiency issues and had to redo my solution to speed\\nit up just a bit.\\n\\n### Solution\\n\\nTedious.\\n\\n## Post Mortem\\n\\n### Indexing\\n\\nI was asked about the indexing after publishing the blog. And truly it is rather\\ncomplicated topic, especially after releasing `SliceIndex<I>` trait. I couldn\'t\\nleave it be, so I tried to implement the `Index` and `IndexMut` trait.\\n\\n:::note\\n\\nI have also mentioned that the `SliceIndex` trait is `unsafe`, but truth be told,\\nonly _unsafe_ part are the 2 methods that are named `*unchecked*`. Anyways, I will\\nbe implementing the `Index*` traits for now, rather than the `SliceIndex`.\\n\\n:::\\n\\nIt\'s relatively straightforward\u2026\\n\\n```rust\\nimpl<I, C> Index<Vector2D<I>> for [C]\\nwhere\\n I: Copy + TryInto<usize>,\\n <I as TryInto<usize>>::Error: Debug,\\n C: Index<usize>,\\n{\\n type Output = C::Output;\\n\\n fn index(&self, index: Vector2D<I>) -> &Self::Output {\\n let (x, y): (usize, usize) =\\n (index.x.try_into().unwrap(), index.y.try_into().unwrap());\\n &self[y][x]\\n }\\n}\\n\\nimpl<I, C> IndexMut<Vector2D<I>> for [C]\\nwhere\\n I: Copy + TryInto<usize>,\\n <I as TryInto<usize>>::Error: Debug,\\n C: IndexMut<usize>,\\n{\\n fn index_mut(&mut self, index: Vector2D<I>) -> &mut Self::Output {\\n let (x, y): (usize, usize) =\\n (index.x.try_into().unwrap(), index.y.try_into().unwrap());\\n &mut self[y][x]\\n }\\n}\\n```\\n\\nWe can see a lot of similarities to the implementation of `index` and `index_mut`\\nfunctions. In the end, they are 1:1, just wrapped in the trait that provides a\\nsyntax sugar for `container[idx]`.\\n\\n:::note\\n\\nI have also switched from using the `TryFrom` to `TryInto` trait, since it better\\nmatches what we are using, the `.try_into` rather than `usize::try_from`.\\n\\nAlso implementing `TryFrom` automatically provides you with a `TryInto` trait,\\nsince it is relatively easy to implement. Just compare the following:\\n\\n```rust\\npub trait TryFrom<T>: Sized {\\n type Error;\\n\\n fn try_from(value: T) -> Result<Self, Self::Error>;\\n}\\n\\npub trait TryInto<T>: Sized {\\n type Error;\\n\\n fn try_into(self) -> Result<T, Self::Error>;\\n}\\n```\\n\\n:::\\n\\nOK, so we have our trait implemented, we should be able to use `container[index]`,\\nright? Yes\u2026 but actually no :frowning:\\n\\n```\\nerror[E0277]: the type `[std::vec::Vec<i8>]` cannot be indexed by `aoc_2022::Vector2D<usize>`\\n --\x3e src/bin/day08.rs:26:18\\n |\\n26 | if trees[pos] > tallest {\\n | ^^^ slice indices are of type `usize` or ranges of `usize`\\n |\\n = help: the trait `std::slice::SliceIndex<[std::vec::Vec<i8>]>` is not implemented for `aoc_2022::Vector2D<usize>`\\n = note: required for `std::vec::Vec<std::vec::Vec<i8>>` to implement `std::ops::Index<aoc_2022::Vector2D<usize>>`\\n\\nerror[E0277]: the type `[std::vec::Vec<i8>]` cannot be indexed by `aoc_2022::Vector2D<usize>`\\n --\x3e src/bin/day08.rs:30:28\\n |\\n30 | max(tallest, trees[pos])\\n | ^^^ slice indices are of type `usize` or ranges of `usize`\\n |\\n = help: the trait `std::slice::SliceIndex<[std::vec::Vec<i8>]>` is not implemented for `aoc_2022::Vector2D<usize>`\\n = note: required for `std::vec::Vec<std::vec::Vec<i8>>` to implement `std::ops::Index<aoc_2022::Vector2D<usize>>`\\n\\nerror[E0277]: the type `[std::vec::Vec<i8>]` cannot be indexed by `aoc_2022::Vector2D<isize>`\\n --\x3e src/bin/day08.rs:52:28\\n |\\n52 | let max_height = trees[position];\\n | ^^^^^^^^ slice indices are of type `usize` or ranges of `usize`\\n |\\n = help: the trait `std::slice::SliceIndex<[std::vec::Vec<i8>]>` is not implemented for `aoc_2022::Vector2D<isize>`\\n = note: required for `std::vec::Vec<std::vec::Vec<i8>>` to implement `std::ops::Index<aoc_2022::Vector2D<isize>>`\\n```\\n\\nWhy? We have it implemented for the slices (`[C]`), why doesn\'t it work? Well,\\nthe fun part consists of the fact that in other place, where we were using it,\\nwe were passing the `&[Vec<T>]`, but this is coming from a helper functions that\\ntake `&Vec<Vec<T>>` instead. And\u2026 we don\'t implement `Index` and `IndexMut` for\\nthose. Just for the slices. \ud83e\udd2f _What are we going to do about it?_\\n\\nWe can either start copy-pasting or be smarter about it\u2026 I choose to be smarter,\\nso let\'s implement a macro! The only difference across the implementations are\\nthe types of the outer containers. Implementation doesn\'t differ **at all**!\\n\\nImplementing the macro can be done in a following way:\\n\\n```rust\\nmacro_rules! generate_indices {\\n ($container:ty) => {\\n impl<I, C> Index<Vector2D<I>> for $container\\n where\\n I: Copy + TryInto<usize>,\\n <I as TryInto<usize>>::Error: Debug,\\n C: Index<usize>,\\n {\\n type Output = C::Output;\\n\\n fn index(&self, index: Vector2D<I>) -> &Self::Output {\\n let (x, y): (usize, usize) =\\n (index.x.try_into().unwrap(), index.y.try_into().unwrap());\\n &self[y][x]\\n }\\n }\\n\\n impl<I, C> IndexMut<Vector2D<I>> for $container\\n where\\n I: Copy + TryInto<usize>,\\n <I as TryInto<usize>>::Error: Debug,\\n C: IndexMut<usize>,\\n {\\n fn index_mut(&mut self, index: Vector2D<I>) -> &mut Self::Output {\\n let (x, y): (usize, usize) =\\n (index.x.try_into().unwrap(), index.y.try_into().unwrap());\\n &mut self[y][x]\\n }\\n }\\n };\\n}\\n```\\n\\nAnd now we can simply do\\n\\n```rust\\ngenerate_indices!(VecDeque<C>);\\ngenerate_indices!([C]);\\ngenerate_indices!(Vec<C>);\\n// generate_indices!([C; N], const N: usize);\\n```\\n\\nThe last type (I took the inspiration from the implementations of the `Index` and\\n`IndexMut` traits) is a bit problematic, because of the `const N: usize` part,\\nwhich I haven\'t managed to be able to parse. And that\'s how I got rid of the error.\\n\\n:::note\\n\\nIf I were to use 2D-indexing over `[C; N]` slices, I\'d probably just go with the\\ncopy-paste, cause the cost of this \u201cmonstrosity\u201d outweighs the benefits of no DRY.\\n\\n:::\\n\\n#### Cause of the problem\\n\\nThis issue is relatively funny. If you don\'t use any type aliases, just the raw\\ntypes, you\'ll get suggested certain changes by the _clippy_. For example if you\\nconsider the following piece of code\\n\\n```rust\\nfn get_sum(nums: &Vec<i32>) -> i32 {\\n nums.iter().sum()\\n}\\n\\nfn main() {\\n let nums = vec![1, 2, 3];\\n println!(\\"Sum: {}\\", get_sum(&nums));\\n}\\n```\\n\\nand you run _clippy_ on it, you will get\\n\\n```\\nChecking playground v0.0.1 (/playground)\\nwarning: writing `&Vec` instead of `&[_]` involves a new object where a slice will do\\n --\x3e src/main.rs:1:18\\n |\\n1 | fn get_sum(nums: &Vec<i32>) -> i32 {\\n | ^^^^^^^^^ help: change this to: `&[i32]`\\n |\\n = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg\\n = note: `#[warn(clippy::ptr_arg)]` on by default\\n\\nwarning: `playground` (bin \\"playground\\") generated 1 warning\\n Finished dev [unoptimized + debuginfo] target(s) in 0.61s\\n```\\n\\nHowever, if you introduce a type alias, such as\\n\\n```rust\\ntype Numbers = Vec<i32>;\\n```\\n\\nThen _clippy_ won\'t say anything, cause there is literally nothing to suggest.\\nHowever the outcome is not the same\u2026\\n\\n[_advent of code_]: https://adventofcode.com\\n[bfs above]: #day-12-hill-climbing-algorithm"},{"id":"aoc-2022/1st-week","metadata":{"permalink":"/blog/aoc-2022/1st-week","editUrl":"https://github.com/mfocko/blog/tree/main/blog/aoc-2022/01-week-1.md","source":"@site/blog/aoc-2022/01-week-1.md","title":"1st week of Advent of Code \'22 in Rust","description":"Surviving first week in Rust.","date":"2022-12-15T01:15:00.000Z","formattedDate":"December 15, 2022","tags":[{"label":"advent-of-code","permalink":"/blog/tags/advent-of-code"},{"label":"advent-of-code-2022","permalink":"/blog/tags/advent-of-code-2022"},{"label":"rust","permalink":"/blog/tags/rust"}],"readingTime":12.4,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"1st week of Advent of Code \'22 in Rust","description":"Surviving first week in Rust.","date":"2022-12-15T01:15","slug":"aoc-2022/1st-week","authors":"mf","tags":["advent-of-code","advent-of-code-2022","rust"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"2nd week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/2nd-week"},"nextItem":{"title":"Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/intro"}},"content":"Let\'s go through the first week of [_Advent of Code_] in Rust.\\n\\n\x3c!--truncate--\x3e\\n\\n:::note\\n\\nIf you wish to have a look at the solutions, you can follow them on my [GitLab].\\nMore specifically in the [`/src/bin/`].\\n\\n:::\\n\\nI will try to summarize my experience with using Rust for the AoC. Trying it out\\nages ago, I believe it will be _pain and suffering_, but we will see. For each\\nday I will also try to give a tl;dr of the problem, so that you can better imagine\\nthe relation to my woes or :+1: moments.\\n\\n## [Day 1: Calorie Counting](https://adventofcode.com/2022/day/1)\\n\\n:::info tl;dr\\n\\nAs the name suggests, we get the calories of the food contained in the elves\\nbackpacks and we want to choose the elf that has the most food ;)\\n\\n:::\\n\\n> Wakey wakey!\\n\\nProgramming in Rust at 6am definitely hits. I\'ve also forgotten to mention how I\\nhandle samples. With each puzzle you usually get a sample input and expected\\noutput. You can use them to verify that your solution works, or usually doesn\'t.\\n\\nAt first I\'ve decided to put asserts into my `main`, something like\\n\\n```rust\\nassert_eq!(part_1(&sample), 24000);\\ninfo!(\\"Part 1: {}\\", part_1(&input));\\n\\nassert_eq!(part_2(&sample), 45000);\\ninfo!(\\"Part 2: {}\\", part_2(&input));\\n```\\n\\nHowever, once you get further, the sample input may take some time to run itself.\\nSo in the end, I have decided to turn them into unit tests:\\n\\n```rust\\n#[cfg(test)]\\nmod tests {\\n use super::*;\\n\\n #[test]\\n fn test_part_1() {\\n let sample = parse_input(\\"samples/day01.txt\\");\\n assert_eq!(part_1(&sample), 24000);\\n }\\n\\n #[test]\\n fn test_part_2() {\\n let sample = parse_input(\\"samples/day01.txt\\");\\n assert_eq!(part_2(&sample), 45000);\\n }\\n}\\n```\\n\\nAnd later on I have noticed, it\'s hard to tell the difference between the days,\\nso I further renamed the `mod` from generic `tests` to reflect the days.\\n\\nAlso after finishing the first day puzzle, I have installed an [`sccache`] to\\ncache the builds, so that the build time is lower, cause it was kinda unbearable.\\n\\n### Solution\\n\\nWell, it\'s a pretty simple problem. You just take the input, sum the calories and\\nfind the biggest one. However, if we try to generalize to more than the biggest\\none, the fun appears. We have few options:\\n\\n- keep all the calories, sort them, take what we need\\n- keep all the calories and use max heap\\n- use min heap and maintain at most N calories that we need\\n\\n## [Day 2: Rock Paper Scissors](https://adventofcode.com/2022/day/2)\\n\\n:::info tl;dr\\n\\nYou want to know what score did you achieve while playing _Rock Paper Scissors_.\\nAnd then you want to be strategic about it.\\n\\n:::\\n\\nApart from the technical details of the puzzle, it went relatively smooth.\\n\\n### Solution\\n\\nI took relatively na\xefve approach and then tried to simplify it.\\n\\n## [Day 3: Rucksack Reorganization](https://adventofcode.com/2022/day/3)\\n\\n:::info tl;dr\\n\\nLet\'s go reorganize elves\' backpacks! Each backpacks has 2 compartments and you\\nwant to find the common item among those compartments. Each of them has priority,\\nyou care only about the sum.\\n\\n:::\\n\\nThis is the day where I started to fight the compiler and neither of us decided\\nto give up. Let\'s dive into it \\\\o/\\n\\n:::tip Fun fact\\n\\nFighting the compiler took me 30 minutes.\\n\\n:::\\n\\nWe need to find a common item among 2 collections, that\'s an easy task, right?\\nWe can construct 2 sets and find an intersection:\\n\\n```rust\\nlet top: HashSet<i32> = [1, 2, 3].iter().collect();\\nlet bottom: HashSet<i32> = [3, 4, 5].iter().collect();\\n```\\n\\nNow, the first issue that we encounter is caused by the fact that we are using\\na slice (the `[\u2026]`), iterator of that returns **references** to the numbers.\\nAnd we get immediately yelled at by the compiler, because the numbers are discarded\\nafter running the `.collect`. To fix this, we can use `.into_iter`:\\n\\n```rust\\nlet top: HashSet<i32> = [1, 2, 3].into_iter().collect();\\nlet bottom: HashSet<i32> = [3, 4, 5].into_iter().collect();\\n```\\n\\nThis way the numbers will get copied instead of referenced. OK, let\'s find the\\nintersection of those 2 collections:\\n\\n```rust\\nprintln!(\\"Common elements: {:?}\\", top.intersection(&bottom));\\n```\\n\\n```\\nCommon elements: [3]\\n```\\n\\n:::caution\\n\\nNotice that we need to do `&bottom`. It explicitly specifies that `.intersection`\\n**borrows** the `bottom`, i.e. takes an immutable reference to it.\\n\\n:::\\n\\nThat\'s what we want, right? Looks like it! \\\\o/\\n\\nNext part wants us to find the common element among all of the backpacks. OK, so\\nthat should be fairly easy, we have an intersection and we want to find intersection\\nover all of them.\\n\\nLet\'s have a look at the type of the `.intersection`\\n\\n```rust\\npub fn intersection<\'a>(\\n\xa0\xa0\xa0\xa0&\'a self,\\n\xa0\xa0\xa0\xa0other: &\'a HashSet<T, S>\\n) -> Intersection<\'a, T, S>\\n```\\n\\nOK\u2026 Huh\u2026 But we have an example there!\\n\\n```rust\\nlet intersection: HashSet<_> = a.intersection(&b).collect();\\n```\\n\\nCool, that\'s all we need.\\n\\n```rust\\nlet top: HashSet<i32> = [1, 2, 3, 4].into_iter().collect();\\nlet bottom: HashSet<i32> = [3, 4, 5, 6].into_iter().collect();\\nlet top_2: HashSet<i32> = [2, 3, 4, 5, 6].into_iter().collect();\\nlet bottom_2: HashSet<i32> = [4, 5, 6].into_iter().collect();\\n\\nlet intersection: HashSet<_> = top.intersection(&bottom).collect();\\nprintln!(\\"Intersection: {:?}\\", intersection);\\n```\\n\\n```\\nIntersection: {3, 4}\\n```\\n\\nCool, so let\'s do the intersection with the `top_2`:\\n\\n```rust\\nlet top: HashSet<i32> = [1, 2, 3, 4].into_iter().collect();\\nlet bottom: HashSet<i32> = [3, 4, 5, 6].into_iter().collect();\\nlet top_2: HashSet<i32> = [2, 3, 4, 5, 6].into_iter().collect();\\nlet bottom_2: HashSet<i32> = [4, 5, 6].into_iter().collect();\\n\\nlet intersection: HashSet<_> = top.intersection(&bottom).collect();\\nlet intersection: HashSet<_> = intersection.intersection(&top_2).collect();\\nprintln!(\\"Intersection: {:?}\\", intersection);\\n```\\n\\nAnd we get yelled at by the compiler:\\n\\n```\\nerror[E0308]: mismatched types\\n --\x3e src/main.rs:10:58\\n |\\n10 | let intersection: HashSet<_> = intersection.intersection(&top_2).collect();\\n | ------------ ^^^^^^ expected `&i32`, found `i32`\\n | |\\n | arguments to this function are incorrect\\n |\\n = note: expected reference `&HashSet<&i32>`\\n found reference `&HashSet<i32>`\\n```\\n\\n/o\\\\ What the hell is going on here? Well, the funny thing is, that this operation\\ndoesn\'t return the elements themselves, but the references to them and when we pass\\nthe third set, it has just the values themselves, without any references.\\n\\n:::tip\\n\\nIt may seem as a very weird decision, but in fact it makes some sense\u2026 It allows\\nyou to do intersection of items that may not be possible to copy. Overall this is\\na \u201ctax\u201d for having a borrow checker ~~drilling your ass~~ having your back and\\nmaking sure you\'re not doing something naughty that may cause an **undefined**\\n**behavior**.\\n\\n:::\\n\\nTo resolve this we need to get an iterator that **clones** the elements:\\n\\n```rust\\nlet top: HashSet<i32> = [1, 2, 3, 4].into_iter().collect();\\nlet bottom: HashSet<i32> = [3, 4, 5, 6].into_iter().collect();\\nlet top_2: HashSet<i32> = [2, 3, 4, 5, 6].into_iter().collect();\\nlet bottom_2: HashSet<i32> = [4, 5, 6].into_iter().collect();\\n\\nlet intersection: HashSet<_> = top.intersection(&bottom).cloned().collect();\\nlet intersection: HashSet<_> = intersection.intersection(&top_2).cloned().collect();\\nlet intersection: HashSet<_> = intersection.intersection(&bottom_2).cloned().collect();\\nprintln!(\\"Intersection: {:?}\\", intersection);\\n```\\n\\n```\\nIntersection: {4}\\n```\\n\\n### Solution\\n\\nThe approach is pretty simple, if you omit the _1on1 with the compiler_. You just\\nhave some fun with the set operations :)\\n\\n## [Day 4: Camp Cleanup](https://adventofcode.com/2022/day/4)\\n\\n:::info tl;dr\\n\\nElves are cleaning up the camp and they got overlapping sections to clean up.\\nFind how many overlap and can take the day off.\\n\\n:::\\n\\n[`RangeInclusive`] is your friend not an enemy :)\\n\\n### Solution\\n\\nRelatively easy, you just need to parse the input and know what you want. Rust\'s\\n`RangeInclusive` type helped a lot, cause it took care of all abstractions.\\n\\n## [Day 5: Supply Stacks](https://adventofcode.com/2022/day/5)\\n\\n:::info tl;dr\\n\\nLet\'s play with stacks of crates.\\n\\n:::\\n\\nVery easy problem with very annoying input. You can judge yourself:\\n\\n```\\n [D]\\n[N] [C]\\n[Z] [M] [P]\\n 1 2 3\\n\\nmove 1 from 2 to 1\\nmove 3 from 1 to 3\\nmove 2 from 2 to 1\\nmove 1 from 1 to 2\\n```\\n\\nGood luck transforming that into something reasonable :)\\n\\n:::tip Fun fact\\n\\nTook me 40 minutes to parse this reasonably, including fighting the compiler.\\n\\n:::\\n\\n### Solution\\n\\nFor the initial solution I went with a manual solution (as in _I have done all_\\n_the work_. Later on I have decided to explore the `std` and interface of the\\n`std::vec::Vec` and found [`split_off`] which takes an index and splits (duh)\\nthe vector:\\n\\n```rust\\nlet mut vec = vec![1, 2, 3];\\nlet vec2 = vec.split_off(1);\\nassert_eq!(vec, [1]);\\nassert_eq!(vec2, [2, 3]);\\n```\\n\\nThis helped me simplify my solution a lot and also get rid of some _edge cases_.\\n\\n## [Day 6: Tuning Trouble](https://adventofcode.com/2022/day/6)\\n\\n:::info tl;dr\\n\\nFinding start of the message in a very weird protocol. Start of the message is\\ndenoted by $N$ unique consecutive characters.\\n\\n:::\\n\\n### Solution\\n\\nA lot of different approaches, knowing that we are dealing with input consisting\\nsolely of ASCII letters, I bit the bullet and went with sliding window and\\nconstructing sets from that window, checking if the set is as big as the window.\\n\\nOne possible optimization could consist of keeping a bit-vector (i.e. `usize`\\nvariable) of encountered characters and updating it as we go. However this has\\na different issue and that is removal of the characters from the left side of the\\nwindow. We don\'t know if the same character is not included later on.\\n\\nOther option is to do similar thing, but keeping the frequencies of the letters,\\nand again knowing we have only ASCII letters we can optimize by having a vector\\nof 26 elements that keeps count for each lowercase letter.\\n\\n## [Day 7: No Space Left On Device](https://adventofcode.com/2022/day/7)\\n\\n:::info tl;dr\\n\\nLet\'s simulate [`du`] to get some stats about our file system and then pinpoint\\ndirectories that take a lot of space and should be deleted.\\n\\n:::\\n\\n> I was waiting for this moment, and yet it got me!\\n> _imagine me swearing for hours_\\n\\n### Solution\\n\\nWe need to \u201c_build_\u201d a file system from the input that is given in a following form:\\n\\n```\\n$ cd /\\n$ ls\\ndir a\\n14848514 b.txt\\n8504156 c.dat\\ndir d\\n$ cd a\\n$ ls\\ndir e\\n29116 f\\n2557 g\\n62596 h.lst\\n$ cd e\\n$ ls\\n584 i\\n$ cd ..\\n$ cd ..\\n$ cd d\\n$ ls\\n4060174 j\\n8033020 d.log\\n5626152 d.ext\\n7214296 k\\n```\\n\\nThere are few ways in which you can achieve this and also you can assume some\\npreconditions, but why would we do that, right? :)\\n\\nYou can \u201cslap\u201d this in either [`HashMap`] or [`BTreeMap`] and call it a day.\\nAnd that would be boring\u2026\\n\\n:::tip\\n\\n`BTreeMap` is quite fitting for this, don\'t you think?\\n\\n:::\\n\\nI always wanted to try allocation on heap in Rust, so I chose to implement a tree.\\nI fought with the `Box<T>` for some time and was losing\u2026\\n\\nThen I looked up some implementations of trees or linked lists and decided to try\\n`Rc<Cell<T>>`. And I got my _ass whopped_ by the compiler once again. /o\\\\\\n\\n:::tip\\n\\n`Box<T>` represents a dynamically allocated memory on heap. It is a single pointer,\\nyou can imagine this as `std::unique_ptr<T>` in C++.\\n\\n`Rc<T>` represents a dynamically allocated memory on heap. On top of that it is\\n_reference counted_ (that\'s what the `Rc` stands for). You can imagine this as\\n`std::shared_ptr<T>` in C++.\\n\\nNow the fun stuff. Neither of them lets you **mutate** the contents of the memory.\\n\\n`Cell<T>` allows you to mutate the memory. Can be used reasonably with types that\\ncan be copied, because the memory safety is guaranteed by copying the contents\\nwhen there is more than one **mutable** reference to the memory.\\n\\n`RefCell<T>` is similar to the `Cell<T>`, but the borrowing rules (how many mutable\\nreferences are present) are checked dynamically.\\n\\nSo in the end, if you want something like `std::shared_ptr<T>` in Rust, you want\\nto have `Rc<RefCell<T>>`.\\n\\n:::\\n\\nSo, how are we going to represent the file system then? We will use an enumeration,\\nhehe, which is an algebraic data type that can store some stuff in itself :weary:\\n\\n```rust\\ntype FileHandle = Rc<RefCell<AocFile>>;\\n\\n#[derive(Debug)]\\nenum AocFile {\\n File(usize),\\n Directory(BTreeMap<String, FileHandle>),\\n}\\n```\\n\\nLet\'s go over it! `FileHandle` represents dynamically allocated `AocFile`, not\\nmuch to discuss. What does the `#[derive(Debug)]` do though? It lets us to print\\nout the value of that enumeration, it\'s derived, so it\'s not as good as if we had\\nimplemented it ourselves, but it\'s good enough for debugging, hence the name.\\n\\nNow to the fun part! `AocFile` value can be represented in two ways:\\n\\n- `File(usize)`, e.g. `AocFile::File(123)` and we can pattern match it, if we\\n need to\\n- `Directory(BTreeMap<String, FileHandle>)` will represent the directory and will\\n contain map matching the name of the files (or directories) within to their\\n respective file handles\\n\\nI will omit the details about constructing this file system, cause there are a lot\\nof technicalities introduced by the nature of the input. However if you are\\ninterested, you can have a look at my solution.\\n\\nWe need to find small enough directories and also find the smallest directory that\\nwill free enough space. Now the question is, how could we do that. And there are\\nmultiple ways I will describe.\\n\\nI have chosen to implement [_tree catamorphism_] :weary:. It is basically a fold\\nover a tree data structure. We descent down into the leaves and propagate computed\\nresults all the way to the root. You can also notice that this approach is very\\nsimilar to _dynamic programming_, we find overlapping sections of the computation\\nand try to minimize the additional work (in this case: we need to know sizes of\\nour descendants, but we have already been there).\\n\\nAnother approach that has been suggested to me few days later is running DFS on\\nthe graph. And, funnily enough, we would still need to combine what we found in\\nthe branches where we descent. So in the end, it would work very similarly to my\\nsolution.\\n\\nOne of the more exotic options would be precomputing the required information at\\nthe same time as parsing. That could be done by adding additional fields to the\\nnodes which would allow storing such information and updating it as we construct\\nthe file system.\\n\\n## Post Mortem\\n\\nThings that have been brought up in the discussion later on.\\n\\n### `Rc<T>` vs `Rc<RefCell<T>>`\\n\\nIt has been brought up that I have a contradicting statement regarding the\\ndynamically allocated memory. Specifically:\\n\\n- You can imagine `Rc<T>` as an `std::shared_ptr<T>` (in C++)\\n- When you want an equivalent of `std::shared_ptr<T>`, you want to use\\n `Rc<RefCell<T>>`\\n\\nNow, in Rust it is a bit more complicated, because the type that represents the\\n\u201cshared pointer\u201d is `Rc<T>`. What `RefCell<T>` does is making sure that there is\\nonly one \u201cowner\u201d of a mutable reference at a time (and dynamically, as opposed\\nto the `Cell<T>`).\\n\\nTherefore to be precise and correct about the equivalents of `std::shared_ptr<T>`\\nin Rust, we can say that\\n\\n- `Rc<T>` is an equivalent of a `const std::shared_ptr<T>`,\\n- and `Rc<RefCell<T>>` is an equivalent of a `std::shared_ptr<T>`.\\n\\nYou can easily see that they only differ in the mutability. (And even that is not\\nas simple as it seems, because there is also `Cell<T>`)\\n\\n[_advent of code_]: https://adventofcode.com\\n[gitlab]: https://gitlab.com/mfocko/advent-of-code-2022\\n[`/src/bin/`]: https://gitlab.com/mfocko/advent-of-code-2022/-/tree/main/src/bin\\n[`sccache`]: https://github.com/mozilla/sccache\\n[`rangeinclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html\\n[`split_off`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.split_off\\n[`du`]: https://www.man7.org/linux/man-pages/man1/du.1.html\\n[`hashmap`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html\\n[`btreemap`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html\\n[_tree catamorphism_]: https://en.wikipedia.org/wiki/Catamorphism#Tree_fold"},{"id":"aoc-2022/intro","metadata":{"permalink":"/blog/aoc-2022/intro","editUrl":"https://github.com/mfocko/blog/tree/main/blog/aoc-2022/00-intro.md","source":"@site/blog/aoc-2022/00-intro.md","title":"Advent of Code \'22 in Rust","description":"Preparing for Advent of Code \'22.","date":"2022-12-14T21:45:00.000Z","formattedDate":"December 14, 2022","tags":[{"label":"advent-of-code","permalink":"/blog/tags/advent-of-code"},{"label":"advent-of-code-2022","permalink":"/blog/tags/advent-of-code-2022"},{"label":"rust","permalink":"/blog/tags/rust"}],"readingTime":8.665,"hasTruncateMarker":true,"authors":[{"name":"Matej Focko","email":"me+blog@mfocko.xyz","title":"a.k.a. @mf","url":"https://gitlab.com/mfocko","imageURL":"https://github.com/mfocko.png","key":"mf"}],"frontMatter":{"title":"Advent of Code \'22 in Rust","description":"Preparing for Advent of Code \'22.","date":"2022-12-14T21:45","slug":"aoc-2022/intro","authors":"mf","tags":["advent-of-code","advent-of-code-2022","rust"],"hide_table_of_contents":false},"unlisted":false,"prevItem":{"title":"1st week of Advent of Code \'22 in Rust","permalink":"/blog/aoc-2022/1st-week"}},"content":"Let\'s talk about the preparations for this year\'s [_Advent of Code_].\\n\\n\x3c!--truncate--\x3e\\n\\n## Choosing a language\\n\\nWhen choosing a language for AoC, you usually want a language that gives you a\\nquick feedback which allows you to iterate quickly to the solution of the puzzle.\\nOne of the most common choices is Python, many people also use JavaScript or Ruby.\\n\\nGiven the competitive nature of the AoC and popularity among competitive programming,\\nC++ might be also a very good choice. Only if you are familiar with it, I guess\u2026\\n\\nIf you want a challenge, you might also choose to rotate the languages each day.\\nThough I prefer to use only one language.\\n\\nFor this year I have been deciding between _Rust_, _C++_ and _Pascal_ or _Ada_.\\n\\nI have tried Rust last year and have survived with it for 3 days and then gave\\nup and switched to _Kotlin_, which was pretty good given it is \u201cJava undercover\u201d.\\nI pretty much like the ideas behind Rust, I am not sure about the whole cult and\\nimplementation of those ideas though. After some years with C/C++, I would say\\nthat Rust feels _too safe_ for my taste and tries to \u201c_punish me_\u201d even for the\\nmost trivial things.\\n\\nC++ is a very robust, but also comes with a wide variety of options providing you\\nthe ability to shoot yourself in the leg. I have tried to solve few days of previous\\nAdvent of Code events, it was _relatively easy_ to solve the problems in C++, given\\nthat I do not admit writing my own iterator for `enumerate`\u2026\\n\\nPascal or Ada were meme choices :) Ada is heavily inspired by Pascal and has a\\npretty nice standard library that offers enough to be able to quickly solve some\\nproblems in it. However the toolkit is questionable :/\\n\\n## Choosing libraries\\n\\n## Preparations for Rust\\n\\nAll of the sources, later on including solutions, can be found at my\\n[GitLab].\\n\\n### Toolkit\\n\\nSince we are using Rust, we are going to use a [Cargo] and more than likely VSCode\\nwith [`rust-analyzer`]. Because of my choice of libraries, we will also introduce\\na `.envrc` file that can be used by [`direnv`], which allows you to set specific\\nenvironment variables when you enter a directory. In our case, we will use\\n\\n```bash\\n# to show nice backtrace when using the color-eyre\\nexport RUST_BACKTRACE=1\\n\\n# to catch logs generated by tracing\\nexport RUST_LOG=trace\\n```\\n\\nAnd for the one of the most obnoxious things ever, we will use a script to download\\nthe inputs instead of \u201c_clicking, opening and copying to a file_\u201d[^1]. There is\\nno need to be _fancy_, so we will adjust Python script by Martin[^2].\\n\\n```py\\n#!/usr/bin/env python3\\n\\nimport datetime\\nimport yaml\\nimport requests\\nimport sys\\n\\n\\ndef load_config():\\n with open(\\"env.yaml\\", \\"r\\") as f:\\n js = yaml.load(f, Loader=yaml.Loader)\\n return js[\\"session\\"], js[\\"year\\"]\\n\\n\\ndef get_input(session, year, day):\\n return requests.get(\\n f\\"https://adventofcode.com/{year}/day/{day}/input\\",\\n cookies={\\"session\\": session},\\n headers={\\n \\"User-Agent\\": \\"{repo} by {mail}\\".format(\\n repo=\\"gitlab.com/mfocko/advent-of-code-2022\\",\\n mail=\\"me@mfocko.xyz\\",\\n )\\n },\\n ).content.decode(\\"utf-8\\")\\n\\n\\ndef main():\\n day = datetime.datetime.now().day\\n if len(sys.argv) == 2:\\n day = sys.argv[1]\\n\\n session, year = load_config()\\n problem_input = get_input(session, year, day)\\n\\n with open(f\\"./inputs/day{day:>02}.txt\\", \\"w\\") as f:\\n f.write(problem_input)\\n\\n\\nif __name__ == \\"__main__\\":\\n main()\\n```\\n\\nIf the script is called without any arguments, it will deduce the day from the\\nsystem, so we do not need to change the day every morning. It also requires a\\nconfiguration file:\\n\\n```yaml\\n# env.yaml\\nsession: \u2039your session cookie\u203a\\nyear: 2022\\n```\\n\\n### Libraries\\n\\nLooking at the list of the libraries, I have chosen \u201ca lot\u201d of them. Let\'s walk\\nthrough each of them.\\n\\n[`tracing`] and [`tracing-subscriber`] are the crates that can be used for tracing\\nand logging of your Rust programs, there are also other crates that can help you\\nwith providing backtrace to the Sentry in case you have deployed your application\\nsomewhere and you want to watch over it. In our use case we will just utilize the\\nmacros for debugging in the terminal.\\n\\n[`thiserror`], [`anyhow`] and [`color-eyre`] are used for error reporting.\\n`thiserror` is a very good choice for libraries, cause it extends the `Error`\\nfrom the `std` and allows you to create more convenient error types. Next is\\n`anyhow` which kinda builds on top of the `thiserror` and provides you with simpler\\nerror handling in binaries[^3]. And finally we have `color-eyre` which, as I found\\nout later, is a colorful (_wink wink_) extension of `eyre` which is fork of `anyhow`\\nwhile supporting customized reports.\\n\\nIn the end I have decided to remove `thiserror` and `anyhow`, since first one is\\nsuitable for libraries and the latter was basically fully replaced by `{color-,}eyre`.\\n\\n[`regex`] and [`lazy_static`] are a very good and also, I hope, self-explanatory\\ncombination. `lazy_static` allows you to have static variables that must be initialized\\nduring runtime.\\n\\n[`itertools`] provides some nice extensions to the iterators from the `std`.\\n\\n### My own \u201clibrary\u201d\\n\\nWhen creating the crate for this year\'s Advent of Code, I have chosen a library\\ntype. Even though standard library is huge, some things might not be included and\\nalso we can follow _KISS_. I have 2 modules that my \u201clibrary\u201d exports, one for\\nparsing and one for 2D vector (that gets used quite often during Advent of Code).\\n\\nKey part is, of course, processing the input and my library exports following\\nfunctions that get used a lot:\\n\\n```rust\\n/// Reads file to the string.\\npub fn file_to_string<P: AsRef<Path>>(pathname: P) -> String;\\n\\n/// Reads file and returns it as a vector of characters.\\npub fn file_to_chars<P: AsRef<Path>>(pathname: P) -> Vec<char>;\\n\\n/// Reads file and returns a vector of parsed structures. Expects each structure\\n/// on its own line in the file. And `T` needs to implement `FromStr` trait.\\npub fn file_to_structs<P: AsRef<Path>, T: FromStr>(pathname: P) -> Vec<T>\\nwhere\\n <T as FromStr>::Err: Debug;\\n\\n/// Converts iterator over strings to a vector of parsed structures. `T` needs\\n/// to implement `FromStr` trait and its error must derive `Debug` trait.\\npub fn strings_to_structs<T: FromStr, U>(\\n iter: impl Iterator<Item = U>\\n) -> Vec<T>\\nwhere\\n <T as std::str::FromStr>::Err: std::fmt::Debug,\\n U: Deref<Target = str>;\\n\\n/// Reads file and returns it as a vector of its lines.\\npub fn file_to_lines<P: AsRef<Path>>(pathname: P) -> Vec<String>;\\n```\\n\\nAs for the vector, I went with a rather simple implementation that allows only\\naddition of the vectors for now and accessing the elements via functions `x()`\\nand `y()`. Also the vector is generic, so we can use it with any numeric type we\\nneed.\\n\\n### Skeleton\\n\\nWe can also prepare a template to quickly bootstrap each of the days. We know\\nthat each puzzle has 2 parts, which means that we can start with 2 functions that\\nwill solve them.\\n\\n```rust\\nfn part1(input: &Input) -> Output {\\n todo!()\\n}\\n\\nfn part2(input: &Input) -> Output {\\n todo!()\\n}\\n```\\n\\nBoth functions take reference to the input and return some output (in majority\\nof puzzles, it is the same type). `todo!()` can be used as a nice placeholder,\\nit also causes a panic when reached and we could also provide some string with\\nan explanation, e.g. `todo!(\\"part 1\\")`. We have not given functions a specific\\ntype and to avoid as much copy-paste as possible, we will introduce type aliases.\\n\\n```rust\\ntype Input = String;\\ntype Output = i32;\\n```\\n\\n:::tip\\n\\nThis allows us to quickly adjust the types only in one place without the need to\\ndo _regex-replace_ or replace them manually.\\n\\n:::\\n\\nFor each day we get a personalized input that is provided as a text file. Almost\\nall the time, we would like to get some structured type out of that input, and\\ntherefore it makes sense to introduce a new function that will provide the parsing\\nof the input.\\n\\n```rust\\nfn parse_input(path: &str) -> Input {\\n todo!()\\n}\\n```\\n\\nThis \u201cparser\u201d will take a path to the file, just in case we would like to run the\\nsample instead of input.\\n\\nOK, so now we can write a `main` function that will take all of the pieces and\\nrun them.\\n\\n```rust\\nfn main() {\\n let input = parse_input(\\"inputs/dayXX.txt\\");\\n\\n println!(\\"Part 1: {}\\", part_1(&input));\\n println!(\\"Part 2: {}\\", part_2(&input));\\n}\\n```\\n\\nThis would definitely do :) But we have installed a few libraries and we want to\\nuse them. In this part we are going to utilize _[`tracing`]_ (for tracing, duh\u2026)\\nand _[`color-eyre`]_ (for better error reporting, e.g. from parsing).\\n\\n```rust\\nfn main() -> Result<()> {\\n tracing_subscriber::fmt()\\n .with_env_filter(EnvFilter::from_default_env())\\n .with_target(false)\\n .with_file(true)\\n .with_line_number(true)\\n .without_time()\\n .compact()\\n .init();\\n color_eyre::install()?;\\n\\n let input = parse_input(\\"inputs/dayXX.txt\\");\\n\\n info!(\\"Part 1: {}\\", part_1(&input));\\n info!(\\"Part 2: {}\\", part_2(&input));\\n\\n Ok(())\\n}\\n```\\n\\nThe first statement will set up tracing and configure it to print out the logs to\\nterminal, based on the environment variable. We also change the formatting a bit,\\nsince we do not need all the _fancy_ features of the logger. Pure initialization\\nwould get us logs like this:\\n\\n```\\n2022-12-11T19:53:19.975343Z INFO day01: Part 1: 0\\n```\\n\\nHowever after running that command, we will get the following:\\n\\n```\\n INFO src/bin/day01.rs:35: Part 1: 0\\n```\\n\\nAnd the `color_eyre::install()?` is quite straightforward. We just initialize the\\nerror reporting by _color eyre_.\\n\\n:::caution\\n\\nNotice that we had to add `Ok(())` to the end of the function and adjust the\\nreturn type of the `main` to `Result<()>`. It is caused by the _color eyre_ that\\ncan be installed only once and therefore it can fail, that is how we got the `?`\\nat the end of the `::install` which _unwraps_ the **\xbbresult\xab** of the installation.\\n\\n:::\\n\\nOverall we will get to a template like this:\\n\\n```rust\\nuse aoc_2022::*;\\n\\nuse color_eyre::eyre::Result;\\nuse tracing::info;\\nuse tracing_subscriber::EnvFilter;\\n\\ntype Input = String;\\ntype Output = i32;\\n\\nfn parse_input(path: &str) -> Input {\\n todo!()\\n}\\n\\nfn part1(input: &Input) -> Output {\\n todo!()\\n}\\n\\nfn part2(input: &Input) -> Output {\\n todo!()\\n}\\n\\nfn main() -> Result<()> {\\n tracing_subscriber::fmt()\\n .with_env_filter(EnvFilter::from_default_env())\\n .with_target(false)\\n .with_file(true)\\n .with_line_number(true)\\n .without_time()\\n .compact()\\n .init();\\n color_eyre::install()?;\\n\\n let input = parse_input(\\"inputs/dayXX.txt\\");\\n\\n info!(\\"Part 1: {}\\", part_1(&input));\\n info!(\\"Part 2: {}\\", part_2(&input));\\n\\n Ok(())\\n}\\n```\\n\\n[^1]:\\n Copy-pasting might be a relaxing thing to do, but you can also discover\\n nasty stuff about your PC. See [this Reddit post and the comment].\\n\\n[^2]: [GitHub profile](https://github.com/martinjonas)\\n[^3]:\\n Even though you can use it even for libraries, but handling errors from\\n libraries using `anyhow` is nasty\u2026 You will be the stinky one ;)\\n\\n[_advent of code_]: https://adventofcode.com\\n[gitlab]: https://gitlab.com/mfocko/advent-of-code-2022\\n[cargo]: https://doc.rust-lang.org/cargo/\\n[`rust-analyzer`]: https://rust-analyzer.github.io/\\n[`direnv`]: https://direnv.net/\\n[`tracing`]: https://crates.io/crates/tracing\\n[`tracing-subscriber`]: https://crates.io/crates/tracing-subscriber\\n[`thiserror`]: https://crates.io/crates/thiserror\\n[`anyhow`]: https://crates.io/crates/anyhow\\n[`color-eyre`]: https://crates.io/crates/color-eyre\\n[`regex`]: https://crates.io/crates/regex\\n[`lazy_static`]: https://crates.io/crates/lazy_static\\n[`itertools`]: https://crates.io/crates/itertools\\n[this reddit post and the comment]: https://www.reddit.com/r/adventofcode/comments/zb98pn/comment/iyq0ono"}]}')}}]); \ No newline at end of file diff --git a/assets/js/595c7293.8ff94b95.js b/assets/js/595c7293.8ff94b95.js deleted file mode 100644 index 7b96390..0000000 --- a/assets/js/595c7293.8ff94b95.js +++ /dev/null @@ -1 +0,0 @@ -"use strict";(self.webpackChunkfi=self.webpackChunkfi||[]).push([[5634],{58396:(e,n,t)=>{t.r(n),t.d(n,{assets:()=>a,contentTitle:()=>o,default:()=>h,frontMatter:()=>r,metadata:()=>c,toc:()=>l});var i=t(85893),s=t(11151);const r={id:"seminar-08",title:"8th seminar",description:"Manipulating with files only char-by-char and a magic tree.\n"},o="8th seminar bonus assignment",c={id:"bonuses/seminar-08",title:"8th seminar",description:"Manipulating with files only char-by-char and a magic tree.\n",source:"@site/c/bonuses/08.md",sourceDirName:"bonuses",slug:"/bonuses/seminar-08",permalink:"/c/bonuses/seminar-08",draft:!1,unlisted:!1,editUrl:"https://github.com/mfocko/blog/tree/main/c/bonuses/08.md",tags:[],version:"current",lastUpdatedAt:1704571953,formattedLastUpdatedAt:"Jan 6, 2024",frontMatter:{id:"seminar-08",title:"8th seminar",description:"Manipulating with files only char-by-char and a magic tree.\n"},sidebar:"autogeneratedBar",previous:{title:"5th and 6th seminar",permalink:"/c/bonuses/seminar-05-06"},next:{title:"10th seminar",permalink:"/c/bonuses/seminar-10"}},a={},l=[{value:"Introduction",id:"introduction",level:2},{value:"Warning",id:"warning",level:2},{value:"Testing",id:"testing",level:2},{value:"Task no. 1: Counting (0.75 K\u20a1)",id:"task-no-1-counting-075-k",level:2},{value:"Requirements",id:"requirements",level:3},{value:"Bonus part (0.75 K\u20a1)",id:"bonus-part-075-k",level:3},{value:"Task no. 2: Weird trees (1 K\u20a1)",id:"task-no-2-weird-trees-1-k",level:2},{value:"Submitting",id:"submitting",level:2}];function d(e){const n={a:"a",blockquote:"blockquote",code:"code",em:"em",h1:"h1",h2:"h2",h3:"h3",hr:"hr",img:"img",li:"li",ol:"ol",p:"p",pre:"pre",strong:"strong",ul:"ul",...(0,s.a)(),...e.components};return(0,i.jsxs)(i.Fragment,{children:[(0,i.jsx)(n.h1,{id:"8th-seminar-bonus-assignment",children:"8th seminar bonus assignment"}),"\n",(0,i.jsx)(n.p,{children:(0,i.jsx)(n.a,{href:"pathname:///files/c/bonuses/08.tar.gz",children:"Source"})}),"\n",(0,i.jsx)(n.h2,{id:"introduction",children:"Introduction"}),"\n",(0,i.jsx)(n.p,{children:"In this bonus you can implement two tasks, one of them has a bonus part with generic\nsolution."}),"\n",(0,i.jsx)(n.p,{children:"One is focused on counting ananas or in case of generic version any substring in\nthe file, but with a restriction on the function you use."}),"\n",(0,i.jsx)(n.p,{children:"Other one has a more algorithmic spirit."}),"\n",(0,i.jsx)(n.p,{children:"For this bonus you can get at maximum 2.5 K\u20a1."}),"\n",(0,i.jsx)(n.h2,{id:"warning",children:"Warning"}),"\n",(0,i.jsxs)(n.p,{children:[(0,i.jsx)(n.strong,{children:"DO NOT COMMIT test data"})," to your own git repository, since the tests include\nfiles that exceed 10MB by themselves. Even if they are on separate branch, they\ntake up the space."]}),"\n",(0,i.jsx)(n.h2,{id:"testing",children:"Testing"}),"\n",(0,i.jsxs)(n.p,{children:["For testing you are provided with python script (requires ",(0,i.jsx)(n.code,{children:"click"})," to be installed:\n",(0,i.jsx)(n.code,{children:"pip3 install --user click"}),") and ",(0,i.jsx)(n.code,{children:"Makefile"})," that provides following targets:"]}),"\n",(0,i.jsxs)(n.ul,{children:["\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"check-counting"})," - runs the ",(0,i.jsx)(n.code,{children:"counting"})," tests"]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"check-counting-bonus"})," - runs the ",(0,i.jsx)(n.code,{children:"counting"})," tests with bonus implemented"]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"check"})," - runs both ",(0,i.jsx)(n.code,{children:"counting"})," and ",(0,i.jsx)(n.code,{children:"counting-bonus"})," tests"]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"clean"})," - removes output files from the test runs"]}),"\n"]}),"\n",(0,i.jsx)(n.h2,{id:"task-no-1-counting-075-k",children:"Task no. 1: Counting (0.75 K\u20a1)"}),"\n",(0,i.jsx)(n.p,{children:"Your first task is to make smallish program that counts occurences of specific\n(or given) word from file and writes the number to other file."}),"\n",(0,i.jsx)(n.p,{children:"Usage of the program is:"}),"\n",(0,i.jsx)(n.pre,{children:(0,i.jsx)(n.code,{children:"Usage: ./counting <input-file> <output-file> [string-to-be-counted]\n"})}),"\n",(0,i.jsx)(n.p,{children:"Arguments that are passed to the program represent:"}),"\n",(0,i.jsxs)(n.ul,{children:["\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"<input-file>"})," - path to the file where we count the words"]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"<output-file>"})," - path to the file where we output the count"]}),"\n",(0,i.jsxs)(n.li,{children:["(optional argument) ",(0,i.jsx)(n.code,{children:"[string-to-be-counted]"})," - in case you implement bonus,\notherwise we default to word ",(0,i.jsx)(n.code,{children:"ananas"})," ;)"]}),"\n"]}),"\n",(0,i.jsx)(n.p,{children:"In skeleton you are given 3 empty, but documented, functions to implement."}),"\n",(0,i.jsxs)(n.ol,{children:["\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"count_anything"})," - function accepts input file and substring to be counted in\nthe file, returns the count."]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"count_ananas"})," - same as ",(0,i.jsx)(n.code,{children:"count_anything"}),", but specialized for ananases, the\ndefault implementation from the skeleton expects you to implement ",(0,i.jsx)(n.code,{children:"count_anything"}),"\nand therefore it just calls the other function."]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"write_number"})," - function that writes the number to the file, why would you\nneed the function is explained later :)"]}),"\n"]}),"\n",(0,i.jsx)(n.h3,{id:"requirements",children:"Requirements"}),"\n",(0,i.jsxs)(n.p,{children:["For manipulation with the files you are only allowed to use ",(0,i.jsx)(n.code,{children:"fopen"}),", ",(0,i.jsx)(n.code,{children:"fclose"}),",\n",(0,i.jsx)(n.code,{children:"fgetc"})," and ",(0,i.jsx)(n.code,{children:"fputc"}),". Functions like ",(0,i.jsx)(n.code,{children:"fprintf"})," (except for ",(0,i.jsx)(n.code,{children:"stderr"})," or logging) and\n",(0,i.jsx)(n.code,{children:"fscanf"})," are ",(0,i.jsx)(n.strong,{children:"forbidden"}),"."]}),"\n",(0,i.jsx)(n.p,{children:"In case you struggle and want to use one of those functions, the solution will be\npenalized by 50% of points."}),"\n",(0,i.jsx)(n.h3,{id:"bonus-part-075-k",children:"Bonus part (0.75 K\u20a1)"}),"\n",(0,i.jsxs)(n.p,{children:["Bonus part of this assignment is to implement ",(0,i.jsx)(n.code,{children:"count_anything"})," rather than ",(0,i.jsx)(n.code,{children:"count_ananas"}),"."]}),"\n",(0,i.jsxs)(n.blockquote,{children:["\n",(0,i.jsx)(n.p,{children:"Smaller hint: This task does not need dynamic allocation :) You just need one\ngood helper function and the right idea ;)"}),"\n"]}),"\n",(0,i.jsx)(n.h2,{id:"task-no-2-weird-trees-1-k",children:"Task no. 2: Weird trees (1 K\u20a1)"}),"\n",(0,i.jsxs)(n.p,{children:["In this task we are crossing our paths with ",(0,i.jsx)(n.em,{children:"algorithms and data structures"}),".\nYour task is to write a program that constructs tree from the file that is given\nas an argument and pretty-prints it."]}),"\n",(0,i.jsxs)(n.p,{children:["Input file consists of lines, that include ",(0,i.jsx)(n.code,{children:"key"})," and ",(0,i.jsx)(n.code,{children:"rank"})," in form ",(0,i.jsx)(n.code,{children:"key;rank"}),"\nor ",(0,i.jsx)(n.code,{children:"nil"}),". Why would we have ",(0,i.jsx)(n.code,{children:"nil"})," in a file? The file represents pre-order iteration\nthrough the tree. Leaves never have rank different than 0, so you can safely assume\n2 non-existing ",(0,i.jsx)(n.code,{children:"nil"}),"s in the input after you read such node ;)"]}),"\n",(0,i.jsxs)("table",{children:[(0,i.jsxs)("tr",{children:[(0,i.jsx)("th",{children:"Example input file"}),(0,i.jsx)("th",{children:"Tree it represents"})]}),(0,i.jsxs)("tr",{children:[(0,i.jsx)("td",{children:(0,i.jsx)(n.pre,{children:(0,i.jsx)(n.code,{children:"8;4\n5;3\n3;2\n2;1\n1;0\nnil\n4;0\n7;1\n6;0\nnil\n11;2\n10;1\n9;0\nnil\n12;0\n"})})}),(0,i.jsx)("td",{children:(0,i.jsx)(n.p,{children:(0,i.jsx)(n.img,{alt:"tree",src:t(30073).Z+"",width:"633",height:"684"})})})]})]}),"\n",(0,i.jsxs)(n.p,{children:["In this task you are only provided with different trees in the ",(0,i.jsx)(n.code,{children:"test-trees"})," directory.\nImplementation and format of the pretty-print is totally up to you. :)"]}),"\n",(0,i.jsx)(n.p,{children:"Example of mine for the tree above:"}),"\n",(0,i.jsx)(n.pre,{children:(0,i.jsx)(n.code,{children:"8 (rank = 4)\n+-- 5 (rank = 3)\n| +-- 3 (rank = 2)\n| | +-- 2 (rank = 1)\n| | | +-- 1 (rank = 0)\n| | +-- 4 (rank = 0)\n| +-- 7 (rank = 1)\n| +-- 6 (rank = 0)\n+-- 11 (rank = 2)\n +-- 10 (rank = 1)\n | +-- 9 (rank = 0)\n +-- 12 (rank = 0)\n"})}),"\n",(0,i.jsxs)(n.blockquote,{children:["\n",(0,i.jsx)(n.p,{children:"Can you find out what are those trees? :)"}),"\n"]}),"\n",(0,i.jsx)(n.h2,{id:"submitting",children:"Submitting"}),"\n",(0,i.jsx)(n.p,{children:"In case you have any questions, feel free to reach out to me."}),"\n",(0,i.jsx)(n.hr,{})]})}function h(e={}){const{wrapper:n}={...(0,s.a)(),...e.components};return n?(0,i.jsx)(n,{...e,children:(0,i.jsx)(d,{...e})}):d(e)}},30073:(e,n,t)=>{t.d(n,{Z:()=>i});const i=t.p+"assets/images/tree-c9e37f87f9095c00fad33ea034485ce6.png"},11151:(e,n,t)=>{t.d(n,{Z:()=>c,a:()=>o});var i=t(67294);const s={},r=i.createContext(s);function o(e){const n=i.useContext(r);return i.useMemo((function(){return"function"==typeof e?e(n):{...n,...e}}),[n,e])}function c(e){let n;return n=e.disableParentContext?"function"==typeof e.components?e.components(s):e.components||s:o(e.components),i.createElement(r.Provider,{value:n},e.children)}}}]); \ No newline at end of file diff --git a/assets/js/595c7293.e8aa1f47.js b/assets/js/595c7293.e8aa1f47.js new file mode 100644 index 0000000..fc8d729 --- /dev/null +++ b/assets/js/595c7293.e8aa1f47.js @@ -0,0 +1 @@ +"use strict";(self.webpackChunkfi=self.webpackChunkfi||[]).push([[5634],{58396:(e,n,t)=>{t.r(n),t.d(n,{assets:()=>a,contentTitle:()=>o,default:()=>h,frontMatter:()=>r,metadata:()=>c,toc:()=>l});var i=t(85893),s=t(11151);const r={id:"seminar-08",title:"8th seminar",description:"Manipulating with files only char-by-char and a magic tree.\n"},o="8th seminar bonus assignment",c={id:"bonuses/seminar-08",title:"8th seminar",description:"Manipulating with files only char-by-char and a magic tree.\n",source:"@site/c/bonuses/08.md",sourceDirName:"bonuses",slug:"/bonuses/seminar-08",permalink:"/c/bonuses/seminar-08",draft:!1,unlisted:!1,editUrl:"https://github.com/mfocko/blog/tree/main/c/bonuses/08.md",tags:[],version:"current",lastUpdatedAt:1706528814,formattedLastUpdatedAt:"Jan 29, 2024",frontMatter:{id:"seminar-08",title:"8th seminar",description:"Manipulating with files only char-by-char and a magic tree.\n"},sidebar:"autogeneratedBar",previous:{title:"5th and 6th seminar",permalink:"/c/bonuses/seminar-05-06"},next:{title:"10th seminar",permalink:"/c/bonuses/seminar-10"}},a={},l=[{value:"Introduction",id:"introduction",level:2},{value:"Warning",id:"warning",level:2},{value:"Testing",id:"testing",level:2},{value:"Task no. 1: Counting (0.75 K\u20a1)",id:"task-no-1-counting-075-k",level:2},{value:"Requirements",id:"requirements",level:3},{value:"Bonus part (0.75 K\u20a1)",id:"bonus-part-075-k",level:3},{value:"Task no. 2: Weird trees (1 K\u20a1)",id:"task-no-2-weird-trees-1-k",level:2},{value:"Submitting",id:"submitting",level:2}];function d(e){const n={a:"a",blockquote:"blockquote",code:"code",em:"em",h1:"h1",h2:"h2",h3:"h3",hr:"hr",img:"img",li:"li",ol:"ol",p:"p",pre:"pre",strong:"strong",ul:"ul",...(0,s.a)(),...e.components};return(0,i.jsxs)(i.Fragment,{children:[(0,i.jsx)(n.h1,{id:"8th-seminar-bonus-assignment",children:"8th seminar bonus assignment"}),"\n",(0,i.jsx)(n.p,{children:(0,i.jsx)(n.a,{href:"pathname:///files/c/bonuses/08.tar.gz",children:"Source"})}),"\n",(0,i.jsx)(n.h2,{id:"introduction",children:"Introduction"}),"\n",(0,i.jsx)(n.p,{children:"In this bonus you can implement two tasks, one of them has a bonus part with generic\nsolution."}),"\n",(0,i.jsx)(n.p,{children:"One is focused on counting ananas or in case of generic version any substring in\nthe file, but with a restriction on the function you use."}),"\n",(0,i.jsx)(n.p,{children:"Other one has a more algorithmic spirit."}),"\n",(0,i.jsx)(n.p,{children:"For this bonus you can get at maximum 2.5 K\u20a1."}),"\n",(0,i.jsx)(n.h2,{id:"warning",children:"Warning"}),"\n",(0,i.jsxs)(n.p,{children:[(0,i.jsx)(n.strong,{children:"DO NOT COMMIT test data"})," to your own git repository, since the tests include\nfiles that exceed 10MB by themselves. Even if they are on separate branch, they\ntake up the space."]}),"\n",(0,i.jsx)(n.h2,{id:"testing",children:"Testing"}),"\n",(0,i.jsxs)(n.p,{children:["For testing you are provided with python script (requires ",(0,i.jsx)(n.code,{children:"click"})," to be installed:\n",(0,i.jsx)(n.code,{children:"pip3 install --user click"}),") and ",(0,i.jsx)(n.code,{children:"Makefile"})," that provides following targets:"]}),"\n",(0,i.jsxs)(n.ul,{children:["\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"check-counting"})," - runs the ",(0,i.jsx)(n.code,{children:"counting"})," tests"]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"check-counting-bonus"})," - runs the ",(0,i.jsx)(n.code,{children:"counting"})," tests with bonus implemented"]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"check"})," - runs both ",(0,i.jsx)(n.code,{children:"counting"})," and ",(0,i.jsx)(n.code,{children:"counting-bonus"})," tests"]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"clean"})," - removes output files from the test runs"]}),"\n"]}),"\n",(0,i.jsx)(n.h2,{id:"task-no-1-counting-075-k",children:"Task no. 1: Counting (0.75 K\u20a1)"}),"\n",(0,i.jsx)(n.p,{children:"Your first task is to make smallish program that counts occurences of specific\n(or given) word from file and writes the number to other file."}),"\n",(0,i.jsx)(n.p,{children:"Usage of the program is:"}),"\n",(0,i.jsx)(n.pre,{children:(0,i.jsx)(n.code,{children:"Usage: ./counting <input-file> <output-file> [string-to-be-counted]\n"})}),"\n",(0,i.jsx)(n.p,{children:"Arguments that are passed to the program represent:"}),"\n",(0,i.jsxs)(n.ul,{children:["\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"<input-file>"})," - path to the file where we count the words"]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"<output-file>"})," - path to the file where we output the count"]}),"\n",(0,i.jsxs)(n.li,{children:["(optional argument) ",(0,i.jsx)(n.code,{children:"[string-to-be-counted]"})," - in case you implement bonus,\notherwise we default to word ",(0,i.jsx)(n.code,{children:"ananas"})," ;)"]}),"\n"]}),"\n",(0,i.jsx)(n.p,{children:"In skeleton you are given 3 empty, but documented, functions to implement."}),"\n",(0,i.jsxs)(n.ol,{children:["\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"count_anything"})," - function accepts input file and substring to be counted in\nthe file, returns the count."]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"count_ananas"})," - same as ",(0,i.jsx)(n.code,{children:"count_anything"}),", but specialized for ananases, the\ndefault implementation from the skeleton expects you to implement ",(0,i.jsx)(n.code,{children:"count_anything"}),"\nand therefore it just calls the other function."]}),"\n",(0,i.jsxs)(n.li,{children:[(0,i.jsx)(n.code,{children:"write_number"})," - function that writes the number to the file, why would you\nneed the function is explained later :)"]}),"\n"]}),"\n",(0,i.jsx)(n.h3,{id:"requirements",children:"Requirements"}),"\n",(0,i.jsxs)(n.p,{children:["For manipulation with the files you are only allowed to use ",(0,i.jsx)(n.code,{children:"fopen"}),", ",(0,i.jsx)(n.code,{children:"fclose"}),",\n",(0,i.jsx)(n.code,{children:"fgetc"})," and ",(0,i.jsx)(n.code,{children:"fputc"}),". Functions like ",(0,i.jsx)(n.code,{children:"fprintf"})," (except for ",(0,i.jsx)(n.code,{children:"stderr"})," or logging) and\n",(0,i.jsx)(n.code,{children:"fscanf"})," are ",(0,i.jsx)(n.strong,{children:"forbidden"}),"."]}),"\n",(0,i.jsx)(n.p,{children:"In case you struggle and want to use one of those functions, the solution will be\npenalized by 50% of points."}),"\n",(0,i.jsx)(n.h3,{id:"bonus-part-075-k",children:"Bonus part (0.75 K\u20a1)"}),"\n",(0,i.jsxs)(n.p,{children:["Bonus part of this assignment is to implement ",(0,i.jsx)(n.code,{children:"count_anything"})," rather than ",(0,i.jsx)(n.code,{children:"count_ananas"}),"."]}),"\n",(0,i.jsxs)(n.blockquote,{children:["\n",(0,i.jsx)(n.p,{children:"Smaller hint: This task does not need dynamic allocation :) You just need one\ngood helper function and the right idea ;)"}),"\n"]}),"\n",(0,i.jsx)(n.h2,{id:"task-no-2-weird-trees-1-k",children:"Task no. 2: Weird trees (1 K\u20a1)"}),"\n",(0,i.jsxs)(n.p,{children:["In this task we are crossing our paths with ",(0,i.jsx)(n.em,{children:"algorithms and data structures"}),".\nYour task is to write a program that constructs tree from the file that is given\nas an argument and pretty-prints it."]}),"\n",(0,i.jsxs)(n.p,{children:["Input file consists of lines, that include ",(0,i.jsx)(n.code,{children:"key"})," and ",(0,i.jsx)(n.code,{children:"rank"})," in form ",(0,i.jsx)(n.code,{children:"key;rank"}),"\nor ",(0,i.jsx)(n.code,{children:"nil"}),". 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lightblue"):console.log.bind(console,"\x1b[34m",ct("INFO"))),e<=at.debug&&(st.debug=console.debug?console.debug.bind(console,ct("DEBUG"),"color: lightgreen"):console.log.bind(console,"\x1b[32m",ct("DEBUG"))),e<=at.trace&&(st.trace=console.debug?console.debug.bind(console,ct("TRACE"),"color: lightgreen"):console.log.bind(console,"\x1b[32m",ct("TRACE")))},ct=t=>`%c${n().format("ss.SSS")} : ${t} : `,ht=/<br\s*\/?>/gi,ut=t=>s.sanitize(t),dt=(t,e)=>{var i;if(!1!==(null==(i=e.flowchart)?void 0:i.htmlLabels)){const i=e.securityLevel;"antiscript"===i||"strict"===i?t=ut(t):"loose"!==i&&(t=(t=(t=gt(t)).replace(/</g,"<").replace(/>/g,">")).replace(/=/g,"="),t=pt(t))}return t},ft=(t,e)=>t?t=e.dompurifyConfig?s.sanitize(dt(t,e),e.dompurifyConfig).toString():s.sanitize(dt(t,e),{FORBID_TAGS:["style"]}).toString():t,pt=t=>t.replace(/#br#/g,"<br/>"),gt=t=>t.replace(ht,"#br#"),mt=t=>!1!==t&&!["false","null","0"].includes(String(t).trim().toLowerCase()),yt=function(t){const e=t.split(/(,)/),i=[];for(let r=0;r<e.length;r++){let t=e[r];if(","===t&&r>0&&r+1<e.length){const n=e[r-1],o=e[r+1];Ct(n,o)&&(t=n+","+o,r++,i.pop())}i.push(bt(t))}return i.join("")},xt=(t,e)=>Math.max(0,t.split(e).length-1),Ct=(t,e)=>{const i=xt(t,"~"),r=xt(e,"~");return 1===i&&1===r},bt=t=>{const e=xt(t,"~");let i=!1;if(e<=1)return t;e%2!=0&&t.startsWith("~")&&(t=t.substring(1),i=!0);const r=[...t];let n=r.indexOf("~"),o=r.lastIndexOf("~");for(;-1!==n&&-1!==o&&n!==o;)r[n]="<",r[o]=">",n=r.indexOf("~"),o=r.lastIndexOf("~");return i&&r.unshift("~"),r.join("")},_t={getRows:t=>{if(!t)return[""];return gt(t).replace(/\\n/g,"#br#").split("#br#")},sanitizeText:ft,sanitizeTextOrArray:(t,e)=>"string"==typeof t?ft(t,e):t.flat().map((t=>ft(t,e))),hasBreaks:t=>ht.test(t),splitBreaks:t=>t.split(ht),lineBreakRegex:ht,removeScript:ut,getUrl:t=>{let e="";return t&&(e=window.location.protocol+"//"+window.location.host+window.location.pathname+window.location.search,e=e.replaceAll(/\(/g,"\\("),e=e.replaceAll(/\)/g,"\\)")),e},evaluate:mt,getMax:function(...t){const e=t.filter((t=>!isNaN(t)));return Math.max(...e)},getMin:function(...t){const e=t.filter((t=>!isNaN(t)));return Math.min(...e)}},vt=(t,e)=>h(t,e?{s:-40,l:10}:{s:-40,l:-10}),kt="#ffffff",Tt="#f2f2f2";let wt=class{constructor(){this.background="#f4f4f4",this.primaryColor="#fff4dd",this.noteBkgColor="#fff5ad",this.noteTextColor="#333",this.THEME_COLOR_LIMIT=12,this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px"}updateColors(){var t,e,i,r,n,o,a,s,l,c,u;if(this.primaryTextColor=this.primaryTextColor||(this.darkMode?"#eee":"#333"),this.secondaryColor=this.secondaryColor||h(this.primaryColor,{h:-120}),this.tertiaryColor=this.tertiaryColor||h(this.primaryColor,{h:180,l:5}),this.primaryBorderColor=this.primaryBorderColor||vt(this.primaryColor,this.darkMode),this.secondaryBorderColor=this.secondaryBorderColor||vt(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=this.tertiaryBorderColor||vt(this.tertiaryColor,this.darkMode),this.noteBorderColor=this.noteBorderColor||vt(this.noteBkgColor,this.darkMode),this.noteBkgColor=this.noteBkgColor||"#fff5ad",this.noteTextColor=this.noteTextColor||"#333",this.secondaryTextColor=this.secondaryTextColor||f(this.secondaryColor),this.tertiaryTextColor=this.tertiaryTextColor||f(this.tertiaryColor),this.lineColor=this.lineColor||f(this.background),this.arrowheadColor=this.arrowheadColor||f(this.background),this.textColor=this.textColor||this.primaryTextColor,this.border2=this.border2||this.tertiaryBorderColor,this.nodeBkg=this.nodeBkg||this.primaryColor,this.mainBkg=this.mainBkg||this.primaryColor,this.nodeBorder=this.nodeBorder||this.primaryBorderColor,this.clusterBkg=this.clusterBkg||this.tertiaryColor,this.clusterBorder=this.clusterBorder||this.tertiaryBorderColor,this.defaultLinkColor=this.defaultLinkColor||this.lineColor,this.titleColor=this.titleColor||this.tertiaryTextColor,this.edgeLabelBackground=this.edgeLabelBackground||(this.darkMode?(0,p.Z)(this.secondaryColor,30):this.secondaryColor),this.nodeTextColor=this.nodeTextColor||this.primaryTextColor,this.actorBorder=this.actorBorder||this.primaryBorderColor,this.actorBkg=this.actorBkg||this.mainBkg,this.actorTextColor=this.actorTextColor||this.primaryTextColor,this.actorLineColor=this.actorLineColor||"grey",this.labelBoxBkgColor=this.labelBoxBkgColor||this.actorBkg,this.signalColor=this.signalColor||this.textColor,this.signalTextColor=this.signalTextColor||this.textColor,this.labelBoxBorderColor=this.labelBoxBorderColor||this.actorBorder,this.labelTextColor=this.labelTextColor||this.actorTextColor,this.loopTextColor=this.loopTextColor||this.actorTextColor,this.activationBorderColor=this.activationBorderColor||(0,p.Z)(this.secondaryColor,10),this.activationBkgColor=this.activationBkgColor||this.secondaryColor,this.sequenceNumberColor=this.sequenceNumberColor||f(this.lineColor),this.sectionBkgColor=this.sectionBkgColor||this.tertiaryColor,this.altSectionBkgColor=this.altSectionBkgColor||"white",this.sectionBkgColor=this.sectionBkgColor||this.secondaryColor,this.sectionBkgColor2=this.sectionBkgColor2||this.primaryColor,this.excludeBkgColor=this.excludeBkgColor||"#eeeeee",this.taskBorderColor=this.taskBorderColor||this.primaryBorderColor,this.taskBkgColor=this.taskBkgColor||this.primaryColor,this.activeTaskBorderColor=this.activeTaskBorderColor||this.primaryColor,this.activeTaskBkgColor=this.activeTaskBkgColor||(0,g.Z)(this.primaryColor,23),this.gridColor=this.gridColor||"lightgrey",this.doneTaskBkgColor=this.doneTaskBkgColor||"lightgrey",this.doneTaskBorderColor=this.doneTaskBorderColor||"grey",this.critBorderColor=this.critBorderColor||"#ff8888",this.critBkgColor=this.critBkgColor||"red",this.todayLineColor=this.todayLineColor||"red",this.taskTextColor=this.taskTextColor||this.textColor,this.taskTextOutsideColor=this.taskTextOutsideColor||this.textColor,this.taskTextLightColor=this.taskTextLightColor||this.textColor,this.taskTextColor=this.taskTextColor||this.primaryTextColor,this.taskTextDarkColor=this.taskTextDarkColor||this.textColor,this.taskTextClickableColor=this.taskTextClickableColor||"#003163",this.personBorder=this.personBorder||this.primaryBorderColor,this.personBkg=this.personBkg||this.mainBkg,this.transitionColor=this.transitionColor||this.lineColor,this.transitionLabelColor=this.transitionLabelColor||this.textColor,this.stateLabelColor=this.stateLabelColor||this.stateBkg||this.primaryTextColor,this.stateBkg=this.stateBkg||this.mainBkg,this.labelBackgroundColor=this.labelBackgroundColor||this.stateBkg,this.compositeBackground=this.compositeBackground||this.background||this.tertiaryColor,this.altBackground=this.altBackground||this.tertiaryColor,this.compositeTitleBackground=this.compositeTitleBackground||this.mainBkg,this.compositeBorder=this.compositeBorder||this.nodeBorder,this.innerEndBackground=this.nodeBorder,this.errorBkgColor=this.errorBkgColor||this.tertiaryColor,this.errorTextColor=this.errorTextColor||this.tertiaryTextColor,this.transitionColor=this.transitionColor||this.lineColor,this.specialStateColor=this.lineColor,this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||h(this.primaryColor,{h:30}),this.cScale4=this.cScale4||h(this.primaryColor,{h:60}),this.cScale5=this.cScale5||h(this.primaryColor,{h:90}),this.cScale6=this.cScale6||h(this.primaryColor,{h:120}),this.cScale7=this.cScale7||h(this.primaryColor,{h:150}),this.cScale8=this.cScale8||h(this.primaryColor,{h:210,l:150}),this.cScale9=this.cScale9||h(this.primaryColor,{h:270}),this.cScale10=this.cScale10||h(this.primaryColor,{h:300}),this.cScale11=this.cScale11||h(this.primaryColor,{h:330}),this.darkMode)for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScale"+h]=(0,p.Z)(this["cScale"+h],75);else for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScale"+h]=(0,p.Z)(this["cScale"+h],25);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleInv"+h]=this["cScaleInv"+h]||f(this["cScale"+h]);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this.darkMode?this["cScalePeer"+h]=this["cScalePeer"+h]||(0,g.Z)(this["cScale"+h],10):this["cScalePeer"+h]=this["cScalePeer"+h]||(0,p.Z)(this["cScale"+h],10);this.scaleLabelColor=this.scaleLabelColor||this.labelTextColor;for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleLabel"+h]=this["cScaleLabel"+h]||this.scaleLabelColor;const d=this.darkMode?-4:-1;for(let f=0;f<5;f++)this["surface"+f]=this["surface"+f]||h(this.mainBkg,{h:180,s:-15,l:d*(5+3*f)}),this["surfacePeer"+f]=this["surfacePeer"+f]||h(this.mainBkg,{h:180,s:-15,l:d*(8+3*f)});this.classText=this.classText||this.textColor,this.fillType0=this.fillType0||this.primaryColor,this.fillType1=this.fillType1||this.secondaryColor,this.fillType2=this.fillType2||h(this.primaryColor,{h:64}),this.fillType3=this.fillType3||h(this.secondaryColor,{h:64}),this.fillType4=this.fillType4||h(this.primaryColor,{h:-64}),this.fillType5=this.fillType5||h(this.secondaryColor,{h:-64}),this.fillType6=this.fillType6||h(this.primaryColor,{h:128}),this.fillType7=this.fillType7||h(this.secondaryColor,{h:128}),this.pie1=this.pie1||this.primaryColor,this.pie2=this.pie2||this.secondaryColor,this.pie3=this.pie3||this.tertiaryColor,this.pie4=this.pie4||h(this.primaryColor,{l:-10}),this.pie5=this.pie5||h(this.secondaryColor,{l:-10}),this.pie6=this.pie6||h(this.tertiaryColor,{l:-10}),this.pie7=this.pie7||h(this.primaryColor,{h:60,l:-10}),this.pie8=this.pie8||h(this.primaryColor,{h:-60,l:-10}),this.pie9=this.pie9||h(this.primaryColor,{h:120,l:0}),this.pie10=this.pie10||h(this.primaryColor,{h:60,l:-20}),this.pie11=this.pie11||h(this.primaryColor,{h:-60,l:-20}),this.pie12=this.pie12||h(this.primaryColor,{h:120,l:-10}),this.pieTitleTextSize=this.pieTitleTextSize||"25px",this.pieTitleTextColor=this.pieTitleTextColor||this.taskTextDarkColor,this.pieSectionTextSize=this.pieSectionTextSize||"17px",this.pieSectionTextColor=this.pieSectionTextColor||this.textColor,this.pieLegendTextSize=this.pieLegendTextSize||"17px",this.pieLegendTextColor=this.pieLegendTextColor||this.taskTextDarkColor,this.pieStrokeColor=this.pieStrokeColor||"black",this.pieStrokeWidth=this.pieStrokeWidth||"2px",this.pieOuterStrokeWidth=this.pieOuterStrokeWidth||"2px",this.pieOuterStrokeColor=this.pieOuterStrokeColor||"black",this.pieOpacity=this.pieOpacity||"0.7",this.quadrant1Fill=this.quadrant1Fill||this.primaryColor,this.quadrant2Fill=this.quadrant2Fill||h(this.primaryColor,{r:5,g:5,b:5}),this.quadrant3Fill=this.quadrant3Fill||h(this.primaryColor,{r:10,g:10,b:10}),this.quadrant4Fill=this.quadrant4Fill||h(this.primaryColor,{r:15,g:15,b:15}),this.quadrant1TextFill=this.quadrant1TextFill||this.primaryTextColor,this.quadrant2TextFill=this.quadrant2TextFill||h(this.primaryTextColor,{r:-5,g:-5,b:-5}),this.quadrant3TextFill=this.quadrant3TextFill||h(this.primaryTextColor,{r:-10,g:-10,b:-10}),this.quadrant4TextFill=this.quadrant4TextFill||h(this.primaryTextColor,{r:-15,g:-15,b:-15}),this.quadrantPointFill=this.quadrantPointFill||(0,m.Z)(this.quadrant1Fill)?(0,g.Z)(this.quadrant1Fill):(0,p.Z)(this.quadrant1Fill),this.quadrantPointTextFill=this.quadrantPointTextFill||this.primaryTextColor,this.quadrantXAxisTextFill=this.quadrantXAxisTextFill||this.primaryTextColor,this.quadrantYAxisTextFill=this.quadrantYAxisTextFill||this.primaryTextColor,this.quadrantInternalBorderStrokeFill=this.quadrantInternalBorderStrokeFill||this.primaryBorderColor,this.quadrantExternalBorderStrokeFill=this.quadrantExternalBorderStrokeFill||this.primaryBorderColor,this.quadrantTitleFill=this.quadrantTitleFill||this.primaryTextColor,this.xyChart={backgroundColor:(null==(t=this.xyChart)?void 0:t.backgroundColor)||this.background,titleColor:(null==(e=this.xyChart)?void 0:e.titleColor)||this.primaryTextColor,xAxisTitleColor:(null==(i=this.xyChart)?void 0:i.xAxisTitleColor)||this.primaryTextColor,xAxisLabelColor:(null==(r=this.xyChart)?void 0:r.xAxisLabelColor)||this.primaryTextColor,xAxisTickColor:(null==(n=this.xyChart)?void 0:n.xAxisTickColor)||this.primaryTextColor,xAxisLineColor:(null==(o=this.xyChart)?void 0:o.xAxisLineColor)||this.primaryTextColor,yAxisTitleColor:(null==(a=this.xyChart)?void 0:a.yAxisTitleColor)||this.primaryTextColor,yAxisLabelColor:(null==(s=this.xyChart)?void 0:s.yAxisLabelColor)||this.primaryTextColor,yAxisTickColor:(null==(l=this.xyChart)?void 0:l.yAxisTickColor)||this.primaryTextColor,yAxisLineColor:(null==(c=this.xyChart)?void 0:c.yAxisLineColor)||this.primaryTextColor,plotColorPalette:(null==(u=this.xyChart)?void 0:u.plotColorPalette)||"#FFF4DD,#FFD8B1,#FFA07A,#ECEFF1,#D6DBDF,#C3E0A8,#FFB6A4,#FFD74D,#738FA7,#FFFFF0"},this.requirementBackground=this.requirementBackground||this.primaryColor,this.requirementBorderColor=this.requirementBorderColor||this.primaryBorderColor,this.requirementBorderSize=this.requirementBorderSize||"1",this.requirementTextColor=this.requirementTextColor||this.primaryTextColor,this.relationColor=this.relationColor||this.lineColor,this.relationLabelBackground=this.relationLabelBackground||(this.darkMode?(0,p.Z)(this.secondaryColor,30):this.secondaryColor),this.relationLabelColor=this.relationLabelColor||this.actorTextColor,this.git0=this.git0||this.primaryColor,this.git1=this.git1||this.secondaryColor,this.git2=this.git2||this.tertiaryColor,this.git3=this.git3||h(this.primaryColor,{h:-30}),this.git4=this.git4||h(this.primaryColor,{h:-60}),this.git5=this.git5||h(this.primaryColor,{h:-90}),this.git6=this.git6||h(this.primaryColor,{h:60}),this.git7=this.git7||h(this.primaryColor,{h:120}),this.darkMode?(this.git0=(0,g.Z)(this.git0,25),this.git1=(0,g.Z)(this.git1,25),this.git2=(0,g.Z)(this.git2,25),this.git3=(0,g.Z)(this.git3,25),this.git4=(0,g.Z)(this.git4,25),this.git5=(0,g.Z)(this.git5,25),this.git6=(0,g.Z)(this.git6,25),this.git7=(0,g.Z)(this.git7,25)):(this.git0=(0,p.Z)(this.git0,25),this.git1=(0,p.Z)(this.git1,25),this.git2=(0,p.Z)(this.git2,25),this.git3=(0,p.Z)(this.git3,25),this.git4=(0,p.Z)(this.git4,25),this.git5=(0,p.Z)(this.git5,25),this.git6=(0,p.Z)(this.git6,25),this.git7=(0,p.Z)(this.git7,25)),this.gitInv0=this.gitInv0||f(this.git0),this.gitInv1=this.gitInv1||f(this.git1),this.gitInv2=this.gitInv2||f(this.git2),this.gitInv3=this.gitInv3||f(this.git3),this.gitInv4=this.gitInv4||f(this.git4),this.gitInv5=this.gitInv5||f(this.git5),this.gitInv6=this.gitInv6||f(this.git6),this.gitInv7=this.gitInv7||f(this.git7),this.branchLabelColor=this.branchLabelColor||(this.darkMode?"black":this.labelTextColor),this.gitBranchLabel0=this.gitBranchLabel0||this.branchLabelColor,this.gitBranchLabel1=this.gitBranchLabel1||this.branchLabelColor,this.gitBranchLabel2=this.gitBranchLabel2||this.branchLabelColor,this.gitBranchLabel3=this.gitBranchLabel3||this.branchLabelColor,this.gitBranchLabel4=this.gitBranchLabel4||this.branchLabelColor,this.gitBranchLabel5=this.gitBranchLabel5||this.branchLabelColor,this.gitBranchLabel6=this.gitBranchLabel6||this.branchLabelColor,this.gitBranchLabel7=this.gitBranchLabel7||this.branchLabelColor,this.tagLabelColor=this.tagLabelColor||this.primaryTextColor,this.tagLabelBackground=this.tagLabelBackground||this.primaryColor,this.tagLabelBorder=this.tagBorder||this.primaryBorderColor,this.tagLabelFontSize=this.tagLabelFontSize||"10px",this.commitLabelColor=this.commitLabelColor||this.secondaryTextColor,this.commitLabelBackground=this.commitLabelBackground||this.secondaryColor,this.commitLabelFontSize=this.commitLabelFontSize||"10px",this.attributeBackgroundColorOdd=this.attributeBackgroundColorOdd||kt,this.attributeBackgroundColorEven=this.attributeBackgroundColorEven||Tt}calculate(t){if("object"!=typeof t)return void this.updateColors();const e=Object.keys(t);e.forEach((e=>{this[e]=t[e]})),this.updateColors(),e.forEach((e=>{this[e]=t[e]}))}};let St=class{constructor(){this.background="#333",this.primaryColor="#1f2020",this.secondaryColor=(0,g.Z)(this.primaryColor,16),this.tertiaryColor=h(this.primaryColor,{h:-160}),this.primaryBorderColor=f(this.background),this.secondaryBorderColor=vt(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=vt(this.tertiaryColor,this.darkMode),this.primaryTextColor=f(this.primaryColor),this.secondaryTextColor=f(this.secondaryColor),this.tertiaryTextColor=f(this.tertiaryColor),this.lineColor=f(this.background),this.textColor=f(this.background),this.mainBkg="#1f2020",this.secondBkg="calculated",this.mainContrastColor="lightgrey",this.darkTextColor=(0,g.Z)(f("#323D47"),10),this.lineColor="calculated",this.border1="#81B1DB",this.border2=(0,u.Z)(255,255,255,.25),this.arrowheadColor="calculated",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.labelBackground="#181818",this.textColor="#ccc",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="#F9FFFE",this.edgeLabelBackground="calculated",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="calculated",this.actorLineColor="calculated",this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="calculated",this.activationBkgColor="calculated",this.sequenceNumberColor="black",this.sectionBkgColor=(0,p.Z)("#EAE8D9",30),this.altSectionBkgColor="calculated",this.sectionBkgColor2="#EAE8D9",this.excludeBkgColor=(0,p.Z)(this.sectionBkgColor,10),this.taskBorderColor=(0,u.Z)(255,255,255,70),this.taskBkgColor="calculated",this.taskTextColor="calculated",this.taskTextLightColor="calculated",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor=(0,u.Z)(255,255,255,50),this.activeTaskBkgColor="#81B1DB",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="grey",this.critBorderColor="#E83737",this.critBkgColor="#E83737",this.taskTextDarkColor="calculated",this.todayLineColor="#DB5757",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.labelColor="calculated",this.errorBkgColor="#a44141",this.errorTextColor="#ddd"}updateColors(){var t,e,i,r,n,o,a,s,l,c,u;this.secondBkg=(0,g.Z)(this.mainBkg,16),this.lineColor=this.mainContrastColor,this.arrowheadColor=this.mainContrastColor,this.nodeBkg=this.mainBkg,this.nodeBorder=this.border1,this.clusterBkg=this.secondBkg,this.clusterBorder=this.border2,this.defaultLinkColor=this.lineColor,this.edgeLabelBackground=(0,g.Z)(this.labelBackground,25),this.actorBorder=this.border1,this.actorBkg=this.mainBkg,this.actorTextColor=this.mainContrastColor,this.actorLineColor=this.mainContrastColor,this.signalColor=this.mainContrastColor,this.signalTextColor=this.mainContrastColor,this.labelBoxBkgColor=this.actorBkg,this.labelBoxBorderColor=this.actorBorder,this.labelTextColor=this.mainContrastColor,this.loopTextColor=this.mainContrastColor,this.noteBorderColor=this.secondaryBorderColor,this.noteBkgColor=this.secondBkg,this.noteTextColor=this.secondaryTextColor,this.activationBorderColor=this.border1,this.activationBkgColor=this.secondBkg,this.altSectionBkgColor=this.background,this.taskBkgColor=(0,g.Z)(this.mainBkg,23),this.taskTextColor=this.darkTextColor,this.taskTextLightColor=this.mainContrastColor,this.taskTextOutsideColor=this.taskTextLightColor,this.gridColor=this.mainContrastColor,this.doneTaskBkgColor=this.mainContrastColor,this.taskTextDarkColor=this.darkTextColor,this.transitionColor=this.transitionColor||this.lineColor,this.transitionLabelColor=this.transitionLabelColor||this.textColor,this.stateLabelColor=this.stateLabelColor||this.stateBkg||this.primaryTextColor,this.stateBkg=this.stateBkg||this.mainBkg,this.labelBackgroundColor=this.labelBackgroundColor||this.stateBkg,this.compositeBackground=this.compositeBackground||this.background||this.tertiaryColor,this.altBackground=this.altBackground||"#555",this.compositeTitleBackground=this.compositeTitleBackground||this.mainBkg,this.compositeBorder=this.compositeBorder||this.nodeBorder,this.innerEndBackground=this.primaryBorderColor,this.specialStateColor="#f4f4f4",this.errorBkgColor=this.errorBkgColor||this.tertiaryColor,this.errorTextColor=this.errorTextColor||this.tertiaryTextColor,this.fillType0=this.primaryColor,this.fillType1=this.secondaryColor,this.fillType2=h(this.primaryColor,{h:64}),this.fillType3=h(this.secondaryColor,{h:64}),this.fillType4=h(this.primaryColor,{h:-64}),this.fillType5=h(this.secondaryColor,{h:-64}),this.fillType6=h(this.primaryColor,{h:128}),this.fillType7=h(this.secondaryColor,{h:128}),this.cScale1=this.cScale1||"#0b0000",this.cScale2=this.cScale2||"#4d1037",this.cScale3=this.cScale3||"#3f5258",this.cScale4=this.cScale4||"#4f2f1b",this.cScale5=this.cScale5||"#6e0a0a",this.cScale6=this.cScale6||"#3b0048",this.cScale7=this.cScale7||"#995a01",this.cScale8=this.cScale8||"#154706",this.cScale9=this.cScale9||"#161722",this.cScale10=this.cScale10||"#00296f",this.cScale11=this.cScale11||"#01629c",this.cScale12=this.cScale12||"#010029",this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||h(this.primaryColor,{h:30}),this.cScale4=this.cScale4||h(this.primaryColor,{h:60}),this.cScale5=this.cScale5||h(this.primaryColor,{h:90}),this.cScale6=this.cScale6||h(this.primaryColor,{h:120}),this.cScale7=this.cScale7||h(this.primaryColor,{h:150}),this.cScale8=this.cScale8||h(this.primaryColor,{h:210}),this.cScale9=this.cScale9||h(this.primaryColor,{h:270}),this.cScale10=this.cScale10||h(this.primaryColor,{h:300}),this.cScale11=this.cScale11||h(this.primaryColor,{h:330});for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleInv"+h]=this["cScaleInv"+h]||f(this["cScale"+h]);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScalePeer"+h]=this["cScalePeer"+h]||(0,g.Z)(this["cScale"+h],10);for(let d=0;d<5;d++)this["surface"+d]=this["surface"+d]||h(this.mainBkg,{h:30,s:-30,l:-(4*d-10)}),this["surfacePeer"+d]=this["surfacePeer"+d]||h(this.mainBkg,{h:30,s:-30,l:-(4*d-7)});this.scaleLabelColor=this.scaleLabelColor||(this.darkMode?"black":this.labelTextColor);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleLabel"+h]=this["cScaleLabel"+h]||this.scaleLabelColor;for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["pie"+h]=this["cScale"+h];this.pieTitleTextSize=this.pieTitleTextSize||"25px",this.pieTitleTextColor=this.pieTitleTextColor||this.taskTextDarkColor,this.pieSectionTextSize=this.pieSectionTextSize||"17px",this.pieSectionTextColor=this.pieSectionTextColor||this.textColor,this.pieLegendTextSize=this.pieLegendTextSize||"17px",this.pieLegendTextColor=this.pieLegendTextColor||this.taskTextDarkColor,this.pieStrokeColor=this.pieStrokeColor||"black",this.pieStrokeWidth=this.pieStrokeWidth||"2px",this.pieOuterStrokeWidth=this.pieOuterStrokeWidth||"2px",this.pieOuterStrokeColor=this.pieOuterStrokeColor||"black",this.pieOpacity=this.pieOpacity||"0.7",this.quadrant1Fill=this.quadrant1Fill||this.primaryColor,this.quadrant2Fill=this.quadrant2Fill||h(this.primaryColor,{r:5,g:5,b:5}),this.quadrant3Fill=this.quadrant3Fill||h(this.primaryColor,{r:10,g:10,b:10}),this.quadrant4Fill=this.quadrant4Fill||h(this.primaryColor,{r:15,g:15,b:15}),this.quadrant1TextFill=this.quadrant1TextFill||this.primaryTextColor,this.quadrant2TextFill=this.quadrant2TextFill||h(this.primaryTextColor,{r:-5,g:-5,b:-5}),this.quadrant3TextFill=this.quadrant3TextFill||h(this.primaryTextColor,{r:-10,g:-10,b:-10}),this.quadrant4TextFill=this.quadrant4TextFill||h(this.primaryTextColor,{r:-15,g:-15,b:-15}),this.quadrantPointFill=this.quadrantPointFill||(0,m.Z)(this.quadrant1Fill)?(0,g.Z)(this.quadrant1Fill):(0,p.Z)(this.quadrant1Fill),this.quadrantPointTextFill=this.quadrantPointTextFill||this.primaryTextColor,this.quadrantXAxisTextFill=this.quadrantXAxisTextFill||this.primaryTextColor,this.quadrantYAxisTextFill=this.quadrantYAxisTextFill||this.primaryTextColor,this.quadrantInternalBorderStrokeFill=this.quadrantInternalBorderStrokeFill||this.primaryBorderColor,this.quadrantExternalBorderStrokeFill=this.quadrantExternalBorderStrokeFill||this.primaryBorderColor,this.quadrantTitleFill=this.quadrantTitleFill||this.primaryTextColor,this.xyChart={backgroundColor:(null==(t=this.xyChart)?void 0:t.backgroundColor)||this.background,titleColor:(null==(e=this.xyChart)?void 0:e.titleColor)||this.primaryTextColor,xAxisTitleColor:(null==(i=this.xyChart)?void 0:i.xAxisTitleColor)||this.primaryTextColor,xAxisLabelColor:(null==(r=this.xyChart)?void 0:r.xAxisLabelColor)||this.primaryTextColor,xAxisTickColor:(null==(n=this.xyChart)?void 0:n.xAxisTickColor)||this.primaryTextColor,xAxisLineColor:(null==(o=this.xyChart)?void 0:o.xAxisLineColor)||this.primaryTextColor,yAxisTitleColor:(null==(a=this.xyChart)?void 0:a.yAxisTitleColor)||this.primaryTextColor,yAxisLabelColor:(null==(s=this.xyChart)?void 0:s.yAxisLabelColor)||this.primaryTextColor,yAxisTickColor:(null==(l=this.xyChart)?void 0:l.yAxisTickColor)||this.primaryTextColor,yAxisLineColor:(null==(c=this.xyChart)?void 0:c.yAxisLineColor)||this.primaryTextColor,plotColorPalette:(null==(u=this.xyChart)?void 0:u.plotColorPalette)||"#3498db,#2ecc71,#e74c3c,#f1c40f,#bdc3c7,#ffffff,#34495e,#9b59b6,#1abc9c,#e67e22"},this.classText=this.primaryTextColor,this.requirementBackground=this.requirementBackground||this.primaryColor,this.requirementBorderColor=this.requirementBorderColor||this.primaryBorderColor,this.requirementBorderSize=this.requirementBorderSize||"1",this.requirementTextColor=this.requirementTextColor||this.primaryTextColor,this.relationColor=this.relationColor||this.lineColor,this.relationLabelBackground=this.relationLabelBackground||(this.darkMode?(0,p.Z)(this.secondaryColor,30):this.secondaryColor),this.relationLabelColor=this.relationLabelColor||this.actorTextColor,this.git0=(0,g.Z)(this.secondaryColor,20),this.git1=(0,g.Z)(this.pie2||this.secondaryColor,20),this.git2=(0,g.Z)(this.pie3||this.tertiaryColor,20),this.git3=(0,g.Z)(this.pie4||h(this.primaryColor,{h:-30}),20),this.git4=(0,g.Z)(this.pie5||h(this.primaryColor,{h:-60}),20),this.git5=(0,g.Z)(this.pie6||h(this.primaryColor,{h:-90}),10),this.git6=(0,g.Z)(this.pie7||h(this.primaryColor,{h:60}),10),this.git7=(0,g.Z)(this.pie8||h(this.primaryColor,{h:120}),20),this.gitInv0=this.gitInv0||f(this.git0),this.gitInv1=this.gitInv1||f(this.git1),this.gitInv2=this.gitInv2||f(this.git2),this.gitInv3=this.gitInv3||f(this.git3),this.gitInv4=this.gitInv4||f(this.git4),this.gitInv5=this.gitInv5||f(this.git5),this.gitInv6=this.gitInv6||f(this.git6),this.gitInv7=this.gitInv7||f(this.git7),this.gitBranchLabel0=this.gitBranchLabel0||f(this.labelTextColor),this.gitBranchLabel1=this.gitBranchLabel1||this.labelTextColor,this.gitBranchLabel2=this.gitBranchLabel2||this.labelTextColor,this.gitBranchLabel3=this.gitBranchLabel3||f(this.labelTextColor),this.gitBranchLabel4=this.gitBranchLabel4||this.labelTextColor,this.gitBranchLabel5=this.gitBranchLabel5||this.labelTextColor,this.gitBranchLabel6=this.gitBranchLabel6||this.labelTextColor,this.gitBranchLabel7=this.gitBranchLabel7||this.labelTextColor,this.tagLabelColor=this.tagLabelColor||this.primaryTextColor,this.tagLabelBackground=this.tagLabelBackground||this.primaryColor,this.tagLabelBorder=this.tagBorder||this.primaryBorderColor,this.tagLabelFontSize=this.tagLabelFontSize||"10px",this.commitLabelColor=this.commitLabelColor||this.secondaryTextColor,this.commitLabelBackground=this.commitLabelBackground||this.secondaryColor,this.commitLabelFontSize=this.commitLabelFontSize||"10px",this.attributeBackgroundColorOdd=this.attributeBackgroundColorOdd||(0,g.Z)(this.background,12),this.attributeBackgroundColorEven=this.attributeBackgroundColorEven||(0,g.Z)(this.background,2)}calculate(t){if("object"!=typeof t)return void this.updateColors();const e=Object.keys(t);e.forEach((e=>{this[e]=t[e]})),this.updateColors(),e.forEach((e=>{this[e]=t[e]}))}};let Bt=class{constructor(){this.background="#f4f4f4",this.primaryColor="#ECECFF",this.secondaryColor=h(this.primaryColor,{h:120}),this.secondaryColor="#ffffde",this.tertiaryColor=h(this.primaryColor,{h:-160}),this.primaryBorderColor=vt(this.primaryColor,this.darkMode),this.secondaryBorderColor=vt(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=vt(this.tertiaryColor,this.darkMode),this.primaryTextColor=f(this.primaryColor),this.secondaryTextColor=f(this.secondaryColor),this.tertiaryTextColor=f(this.tertiaryColor),this.lineColor=f(this.background),this.textColor=f(this.background),this.background="white",this.mainBkg="#ECECFF",this.secondBkg="#ffffde",this.lineColor="#333333",this.border1="#9370DB",this.border2="#aaaa33",this.arrowheadColor="#333333",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.labelBackground="#e8e8e8",this.textColor="#333",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="calculated",this.edgeLabelBackground="calculated",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="black",this.actorLineColor="grey",this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="calculated",this.altSectionBkgColor="calculated",this.sectionBkgColor2="calculated",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="calculated",this.taskTextLightColor="calculated",this.taskTextColor=this.taskTextLightColor,this.taskTextDarkColor="calculated",this.taskTextOutsideColor=this.taskTextDarkColor,this.taskTextClickableColor="calculated",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="calculated",this.critBorderColor="calculated",this.critBkgColor="calculated",this.todayLineColor="calculated",this.sectionBkgColor=(0,u.Z)(102,102,255,.49),this.altSectionBkgColor="white",this.sectionBkgColor2="#fff400",this.taskBorderColor="#534fbc",this.taskBkgColor="#8a90dd",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="black",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="#534fbc",this.activeTaskBkgColor="#bfc7ff",this.gridColor="lightgrey",this.doneTaskBkgColor="lightgrey",this.doneTaskBorderColor="grey",this.critBorderColor="#ff8888",this.critBkgColor="red",this.todayLineColor="red",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222",this.updateColors()}updateColors(){var t,e,i,r,n,o,a,s,l,c,u;this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||h(this.primaryColor,{h:30}),this.cScale4=this.cScale4||h(this.primaryColor,{h:60}),this.cScale5=this.cScale5||h(this.primaryColor,{h:90}),this.cScale6=this.cScale6||h(this.primaryColor,{h:120}),this.cScale7=this.cScale7||h(this.primaryColor,{h:150}),this.cScale8=this.cScale8||h(this.primaryColor,{h:210}),this.cScale9=this.cScale9||h(this.primaryColor,{h:270}),this.cScale10=this.cScale10||h(this.primaryColor,{h:300}),this.cScale11=this.cScale11||h(this.primaryColor,{h:330}),this.cScalePeer1=this.cScalePeer1||(0,p.Z)(this.secondaryColor,45),this.cScalePeer2=this.cScalePeer2||(0,p.Z)(this.tertiaryColor,40);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScale"+h]=(0,p.Z)(this["cScale"+h],10),this["cScalePeer"+h]=this["cScalePeer"+h]||(0,p.Z)(this["cScale"+h],25);for(let d=0;d<this.THEME_COLOR_LIMIT;d++)this["cScaleInv"+d]=this["cScaleInv"+d]||h(this["cScale"+d],{h:180});for(let d=0;d<5;d++)this["surface"+d]=this["surface"+d]||h(this.mainBkg,{h:30,l:-(5+5*d)}),this["surfacePeer"+d]=this["surfacePeer"+d]||h(this.mainBkg,{h:30,l:-(7+5*d)});if(this.scaleLabelColor="calculated"!==this.scaleLabelColor&&this.scaleLabelColor?this.scaleLabelColor:this.labelTextColor,"calculated"!==this.labelTextColor){this.cScaleLabel0=this.cScaleLabel0||f(this.labelTextColor),this.cScaleLabel3=this.cScaleLabel3||f(this.labelTextColor);for(let t=0;t<this.THEME_COLOR_LIMIT;t++)this["cScaleLabel"+t]=this["cScaleLabel"+t]||this.labelTextColor}this.nodeBkg=this.mainBkg,this.nodeBorder=this.border1,this.clusterBkg=this.secondBkg,this.clusterBorder=this.border2,this.defaultLinkColor=this.lineColor,this.titleColor=this.textColor,this.edgeLabelBackground=this.labelBackground,this.actorBorder=(0,g.Z)(this.border1,23),this.actorBkg=this.mainBkg,this.labelBoxBkgColor=this.actorBkg,this.signalColor=this.textColor,this.signalTextColor=this.textColor,this.labelBoxBorderColor=this.actorBorder,this.labelTextColor=this.actorTextColor,this.loopTextColor=this.actorTextColor,this.noteBorderColor=this.border2,this.noteTextColor=this.actorTextColor,this.taskTextColor=this.taskTextLightColor,this.taskTextOutsideColor=this.taskTextDarkColor,this.transitionColor=this.transitionColor||this.lineColor,this.transitionLabelColor=this.transitionLabelColor||this.textColor,this.stateLabelColor=this.stateLabelColor||this.stateBkg||this.primaryTextColor,this.stateBkg=this.stateBkg||this.mainBkg,this.labelBackgroundColor=this.labelBackgroundColor||this.stateBkg,this.compositeBackground=this.compositeBackground||this.background||this.tertiaryColor,this.altBackground=this.altBackground||"#f0f0f0",this.compositeTitleBackground=this.compositeTitleBackground||this.mainBkg,this.compositeBorder=this.compositeBorder||this.nodeBorder,this.innerEndBackground=this.nodeBorder,this.specialStateColor=this.lineColor,this.errorBkgColor=this.errorBkgColor||this.tertiaryColor,this.errorTextColor=this.errorTextColor||this.tertiaryTextColor,this.transitionColor=this.transitionColor||this.lineColor,this.classText=this.primaryTextColor,this.fillType0=this.primaryColor,this.fillType1=this.secondaryColor,this.fillType2=h(this.primaryColor,{h:64}),this.fillType3=h(this.secondaryColor,{h:64}),this.fillType4=h(this.primaryColor,{h:-64}),this.fillType5=h(this.secondaryColor,{h:-64}),this.fillType6=h(this.primaryColor,{h:128}),this.fillType7=h(this.secondaryColor,{h:128}),this.pie1=this.pie1||this.primaryColor,this.pie2=this.pie2||this.secondaryColor,this.pie3=this.pie3||h(this.tertiaryColor,{l:-40}),this.pie4=this.pie4||h(this.primaryColor,{l:-10}),this.pie5=this.pie5||h(this.secondaryColor,{l:-30}),this.pie6=this.pie6||h(this.tertiaryColor,{l:-20}),this.pie7=this.pie7||h(this.primaryColor,{h:60,l:-20}),this.pie8=this.pie8||h(this.primaryColor,{h:-60,l:-40}),this.pie9=this.pie9||h(this.primaryColor,{h:120,l:-40}),this.pie10=this.pie10||h(this.primaryColor,{h:60,l:-40}),this.pie11=this.pie11||h(this.primaryColor,{h:-90,l:-40}),this.pie12=this.pie12||h(this.primaryColor,{h:120,l:-30}),this.pieTitleTextSize=this.pieTitleTextSize||"25px",this.pieTitleTextColor=this.pieTitleTextColor||this.taskTextDarkColor,this.pieSectionTextSize=this.pieSectionTextSize||"17px",this.pieSectionTextColor=this.pieSectionTextColor||this.textColor,this.pieLegendTextSize=this.pieLegendTextSize||"17px",this.pieLegendTextColor=this.pieLegendTextColor||this.taskTextDarkColor,this.pieStrokeColor=this.pieStrokeColor||"black",this.pieStrokeWidth=this.pieStrokeWidth||"2px",this.pieOuterStrokeWidth=this.pieOuterStrokeWidth||"2px",this.pieOuterStrokeColor=this.pieOuterStrokeColor||"black",this.pieOpacity=this.pieOpacity||"0.7",this.quadrant1Fill=this.quadrant1Fill||this.primaryColor,this.quadrant2Fill=this.quadrant2Fill||h(this.primaryColor,{r:5,g:5,b:5}),this.quadrant3Fill=this.quadrant3Fill||h(this.primaryColor,{r:10,g:10,b:10}),this.quadrant4Fill=this.quadrant4Fill||h(this.primaryColor,{r:15,g:15,b:15}),this.quadrant1TextFill=this.quadrant1TextFill||this.primaryTextColor,this.quadrant2TextFill=this.quadrant2TextFill||h(this.primaryTextColor,{r:-5,g:-5,b:-5}),this.quadrant3TextFill=this.quadrant3TextFill||h(this.primaryTextColor,{r:-10,g:-10,b:-10}),this.quadrant4TextFill=this.quadrant4TextFill||h(this.primaryTextColor,{r:-15,g:-15,b:-15}),this.quadrantPointFill=this.quadrantPointFill||(0,m.Z)(this.quadrant1Fill)?(0,g.Z)(this.quadrant1Fill):(0,p.Z)(this.quadrant1Fill),this.quadrantPointTextFill=this.quadrantPointTextFill||this.primaryTextColor,this.quadrantXAxisTextFill=this.quadrantXAxisTextFill||this.primaryTextColor,this.quadrantYAxisTextFill=this.quadrantYAxisTextFill||this.primaryTextColor,this.quadrantInternalBorderStrokeFill=this.quadrantInternalBorderStrokeFill||this.primaryBorderColor,this.quadrantExternalBorderStrokeFill=this.quadrantExternalBorderStrokeFill||this.primaryBorderColor,this.quadrantTitleFill=this.quadrantTitleFill||this.primaryTextColor,this.xyChart={backgroundColor:(null==(t=this.xyChart)?void 0:t.backgroundColor)||this.background,titleColor:(null==(e=this.xyChart)?void 0:e.titleColor)||this.primaryTextColor,xAxisTitleColor:(null==(i=this.xyChart)?void 0:i.xAxisTitleColor)||this.primaryTextColor,xAxisLabelColor:(null==(r=this.xyChart)?void 0:r.xAxisLabelColor)||this.primaryTextColor,xAxisTickColor:(null==(n=this.xyChart)?void 0:n.xAxisTickColor)||this.primaryTextColor,xAxisLineColor:(null==(o=this.xyChart)?void 0:o.xAxisLineColor)||this.primaryTextColor,yAxisTitleColor:(null==(a=this.xyChart)?void 0:a.yAxisTitleColor)||this.primaryTextColor,yAxisLabelColor:(null==(s=this.xyChart)?void 0:s.yAxisLabelColor)||this.primaryTextColor,yAxisTickColor:(null==(l=this.xyChart)?void 0:l.yAxisTickColor)||this.primaryTextColor,yAxisLineColor:(null==(c=this.xyChart)?void 0:c.yAxisLineColor)||this.primaryTextColor,plotColorPalette:(null==(u=this.xyChart)?void 0:u.plotColorPalette)||"#ECECFF,#8493A6,#FFC3A0,#DCDDE1,#B8E994,#D1A36F,#C3CDE6,#FFB6C1,#496078,#F8F3E3"},this.requirementBackground=this.requirementBackground||this.primaryColor,this.requirementBorderColor=this.requirementBorderColor||this.primaryBorderColor,this.requirementBorderSize=this.requirementBorderSize||"1",this.requirementTextColor=this.requirementTextColor||this.primaryTextColor,this.relationColor=this.relationColor||this.lineColor,this.relationLabelBackground=this.relationLabelBackground||this.labelBackground,this.relationLabelColor=this.relationLabelColor||this.actorTextColor,this.git0=this.git0||this.primaryColor,this.git1=this.git1||this.secondaryColor,this.git2=this.git2||this.tertiaryColor,this.git3=this.git3||h(this.primaryColor,{h:-30}),this.git4=this.git4||h(this.primaryColor,{h:-60}),this.git5=this.git5||h(this.primaryColor,{h:-90}),this.git6=this.git6||h(this.primaryColor,{h:60}),this.git7=this.git7||h(this.primaryColor,{h:120}),this.darkMode?(this.git0=(0,g.Z)(this.git0,25),this.git1=(0,g.Z)(this.git1,25),this.git2=(0,g.Z)(this.git2,25),this.git3=(0,g.Z)(this.git3,25),this.git4=(0,g.Z)(this.git4,25),this.git5=(0,g.Z)(this.git5,25),this.git6=(0,g.Z)(this.git6,25),this.git7=(0,g.Z)(this.git7,25)):(this.git0=(0,p.Z)(this.git0,25),this.git1=(0,p.Z)(this.git1,25),this.git2=(0,p.Z)(this.git2,25),this.git3=(0,p.Z)(this.git3,25),this.git4=(0,p.Z)(this.git4,25),this.git5=(0,p.Z)(this.git5,25),this.git6=(0,p.Z)(this.git6,25),this.git7=(0,p.Z)(this.git7,25)),this.gitInv0=this.gitInv0||(0,p.Z)(f(this.git0),25),this.gitInv1=this.gitInv1||f(this.git1),this.gitInv2=this.gitInv2||f(this.git2),this.gitInv3=this.gitInv3||f(this.git3),this.gitInv4=this.gitInv4||f(this.git4),this.gitInv5=this.gitInv5||f(this.git5),this.gitInv6=this.gitInv6||f(this.git6),this.gitInv7=this.gitInv7||f(this.git7),this.gitBranchLabel0=this.gitBranchLabel0||f(this.labelTextColor),this.gitBranchLabel1=this.gitBranchLabel1||this.labelTextColor,this.gitBranchLabel2=this.gitBranchLabel2||this.labelTextColor,this.gitBranchLabel3=this.gitBranchLabel3||f(this.labelTextColor),this.gitBranchLabel4=this.gitBranchLabel4||this.labelTextColor,this.gitBranchLabel5=this.gitBranchLabel5||this.labelTextColor,this.gitBranchLabel6=this.gitBranchLabel6||this.labelTextColor,this.gitBranchLabel7=this.gitBranchLabel7||this.labelTextColor,this.tagLabelColor=this.tagLabelColor||this.primaryTextColor,this.tagLabelBackground=this.tagLabelBackground||this.primaryColor,this.tagLabelBorder=this.tagBorder||this.primaryBorderColor,this.tagLabelFontSize=this.tagLabelFontSize||"10px",this.commitLabelColor=this.commitLabelColor||this.secondaryTextColor,this.commitLabelBackground=this.commitLabelBackground||this.secondaryColor,this.commitLabelFontSize=this.commitLabelFontSize||"10px",this.attributeBackgroundColorOdd=this.attributeBackgroundColorOdd||kt,this.attributeBackgroundColorEven=this.attributeBackgroundColorEven||Tt}calculate(t){if("object"!=typeof t)return void this.updateColors();const e=Object.keys(t);e.forEach((e=>{this[e]=t[e]})),this.updateColors(),e.forEach((e=>{this[e]=t[e]}))}};const Ft=t=>{const e=new Bt;return e.calculate(t),e};let At=class{constructor(){this.background="#f4f4f4",this.primaryColor="#cde498",this.secondaryColor="#cdffb2",this.background="white",this.mainBkg="#cde498",this.secondBkg="#cdffb2",this.lineColor="green",this.border1="#13540c",this.border2="#6eaa49",this.arrowheadColor="green",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.tertiaryColor=(0,g.Z)("#cde498",10),this.primaryBorderColor=vt(this.primaryColor,this.darkMode),this.secondaryBorderColor=vt(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=vt(this.tertiaryColor,this.darkMode),this.primaryTextColor=f(this.primaryColor),this.secondaryTextColor=f(this.secondaryColor),this.tertiaryTextColor=f(this.primaryColor),this.lineColor=f(this.background),this.textColor=f(this.background),this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="#333",this.edgeLabelBackground="#e8e8e8",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="black",this.actorLineColor="grey",this.signalColor="#333",this.signalTextColor="#333",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="#326932",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="#fff5ad",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="#6eaa49",this.altSectionBkgColor="white",this.sectionBkgColor2="#6eaa49",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="#487e3a",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="black",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="lightgrey",this.doneTaskBkgColor="lightgrey",this.doneTaskBorderColor="grey",this.critBorderColor="#ff8888",this.critBkgColor="red",this.todayLineColor="red",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222"}updateColors(){var t,e,i,r,n,o,a,s,l,c,u;this.actorBorder=(0,p.Z)(this.mainBkg,20),this.actorBkg=this.mainBkg,this.labelBoxBkgColor=this.actorBkg,this.labelTextColor=this.actorTextColor,this.loopTextColor=this.actorTextColor,this.noteBorderColor=this.border2,this.noteTextColor=this.actorTextColor,this.cScale0=this.cScale0||this.primaryColor,this.cScale1=this.cScale1||this.secondaryColor,this.cScale2=this.cScale2||this.tertiaryColor,this.cScale3=this.cScale3||h(this.primaryColor,{h:30}),this.cScale4=this.cScale4||h(this.primaryColor,{h:60}),this.cScale5=this.cScale5||h(this.primaryColor,{h:90}),this.cScale6=this.cScale6||h(this.primaryColor,{h:120}),this.cScale7=this.cScale7||h(this.primaryColor,{h:150}),this.cScale8=this.cScale8||h(this.primaryColor,{h:210}),this.cScale9=this.cScale9||h(this.primaryColor,{h:270}),this.cScale10=this.cScale10||h(this.primaryColor,{h:300}),this.cScale11=this.cScale11||h(this.primaryColor,{h:330}),this.cScalePeer1=this.cScalePeer1||(0,p.Z)(this.secondaryColor,45),this.cScalePeer2=this.cScalePeer2||(0,p.Z)(this.tertiaryColor,40);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScale"+h]=(0,p.Z)(this["cScale"+h],10),this["cScalePeer"+h]=this["cScalePeer"+h]||(0,p.Z)(this["cScale"+h],25);for(let d=0;d<this.THEME_COLOR_LIMIT;d++)this["cScaleInv"+d]=this["cScaleInv"+d]||h(this["cScale"+d],{h:180});this.scaleLabelColor="calculated"!==this.scaleLabelColor&&this.scaleLabelColor?this.scaleLabelColor:this.labelTextColor;for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleLabel"+h]=this["cScaleLabel"+h]||this.scaleLabelColor;for(let d=0;d<5;d++)this["surface"+d]=this["surface"+d]||h(this.mainBkg,{h:30,s:-30,l:-(5+5*d)}),this["surfacePeer"+d]=this["surfacePeer"+d]||h(this.mainBkg,{h:30,s:-30,l:-(8+5*d)});this.nodeBkg=this.mainBkg,this.nodeBorder=this.border1,this.clusterBkg=this.secondBkg,this.clusterBorder=this.border2,this.defaultLinkColor=this.lineColor,this.taskBorderColor=this.border1,this.taskTextColor=this.taskTextLightColor,this.taskTextOutsideColor=this.taskTextDarkColor,this.activeTaskBorderColor=this.taskBorderColor,this.activeTaskBkgColor=this.mainBkg,this.transitionColor=this.transitionColor||this.lineColor,this.transitionLabelColor=this.transitionLabelColor||this.textColor,this.stateLabelColor=this.stateLabelColor||this.stateBkg||this.primaryTextColor,this.stateBkg=this.stateBkg||this.mainBkg,this.labelBackgroundColor=this.labelBackgroundColor||this.stateBkg,this.compositeBackground=this.compositeBackground||this.background||this.tertiaryColor,this.altBackground=this.altBackground||"#f0f0f0",this.compositeTitleBackground=this.compositeTitleBackground||this.mainBkg,this.compositeBorder=this.compositeBorder||this.nodeBorder,this.innerEndBackground=this.primaryBorderColor,this.specialStateColor=this.lineColor,this.errorBkgColor=this.errorBkgColor||this.tertiaryColor,this.errorTextColor=this.errorTextColor||this.tertiaryTextColor,this.transitionColor=this.transitionColor||this.lineColor,this.classText=this.primaryTextColor,this.fillType0=this.primaryColor,this.fillType1=this.secondaryColor,this.fillType2=h(this.primaryColor,{h:64}),this.fillType3=h(this.secondaryColor,{h:64}),this.fillType4=h(this.primaryColor,{h:-64}),this.fillType5=h(this.secondaryColor,{h:-64}),this.fillType6=h(this.primaryColor,{h:128}),this.fillType7=h(this.secondaryColor,{h:128}),this.pie1=this.pie1||this.primaryColor,this.pie2=this.pie2||this.secondaryColor,this.pie3=this.pie3||this.tertiaryColor,this.pie4=this.pie4||h(this.primaryColor,{l:-30}),this.pie5=this.pie5||h(this.secondaryColor,{l:-30}),this.pie6=this.pie6||h(this.tertiaryColor,{h:40,l:-40}),this.pie7=this.pie7||h(this.primaryColor,{h:60,l:-10}),this.pie8=this.pie8||h(this.primaryColor,{h:-60,l:-10}),this.pie9=this.pie9||h(this.primaryColor,{h:120,l:0}),this.pie10=this.pie10||h(this.primaryColor,{h:60,l:-50}),this.pie11=this.pie11||h(this.primaryColor,{h:-60,l:-50}),this.pie12=this.pie12||h(this.primaryColor,{h:120,l:-50}),this.pieTitleTextSize=this.pieTitleTextSize||"25px",this.pieTitleTextColor=this.pieTitleTextColor||this.taskTextDarkColor,this.pieSectionTextSize=this.pieSectionTextSize||"17px",this.pieSectionTextColor=this.pieSectionTextColor||this.textColor,this.pieLegendTextSize=this.pieLegendTextSize||"17px",this.pieLegendTextColor=this.pieLegendTextColor||this.taskTextDarkColor,this.pieStrokeColor=this.pieStrokeColor||"black",this.pieStrokeWidth=this.pieStrokeWidth||"2px",this.pieOuterStrokeWidth=this.pieOuterStrokeWidth||"2px",this.pieOuterStrokeColor=this.pieOuterStrokeColor||"black",this.pieOpacity=this.pieOpacity||"0.7",this.quadrant1Fill=this.quadrant1Fill||this.primaryColor,this.quadrant2Fill=this.quadrant2Fill||h(this.primaryColor,{r:5,g:5,b:5}),this.quadrant3Fill=this.quadrant3Fill||h(this.primaryColor,{r:10,g:10,b:10}),this.quadrant4Fill=this.quadrant4Fill||h(this.primaryColor,{r:15,g:15,b:15}),this.quadrant1TextFill=this.quadrant1TextFill||this.primaryTextColor,this.quadrant2TextFill=this.quadrant2TextFill||h(this.primaryTextColor,{r:-5,g:-5,b:-5}),this.quadrant3TextFill=this.quadrant3TextFill||h(this.primaryTextColor,{r:-10,g:-10,b:-10}),this.quadrant4TextFill=this.quadrant4TextFill||h(this.primaryTextColor,{r:-15,g:-15,b:-15}),this.quadrantPointFill=this.quadrantPointFill||(0,m.Z)(this.quadrant1Fill)?(0,g.Z)(this.quadrant1Fill):(0,p.Z)(this.quadrant1Fill),this.quadrantPointTextFill=this.quadrantPointTextFill||this.primaryTextColor,this.quadrantXAxisTextFill=this.quadrantXAxisTextFill||this.primaryTextColor,this.quadrantYAxisTextFill=this.quadrantYAxisTextFill||this.primaryTextColor,this.quadrantInternalBorderStrokeFill=this.quadrantInternalBorderStrokeFill||this.primaryBorderColor,this.quadrantExternalBorderStrokeFill=this.quadrantExternalBorderStrokeFill||this.primaryBorderColor,this.quadrantTitleFill=this.quadrantTitleFill||this.primaryTextColor,this.xyChart={backgroundColor:(null==(t=this.xyChart)?void 0:t.backgroundColor)||this.background,titleColor:(null==(e=this.xyChart)?void 0:e.titleColor)||this.primaryTextColor,xAxisTitleColor:(null==(i=this.xyChart)?void 0:i.xAxisTitleColor)||this.primaryTextColor,xAxisLabelColor:(null==(r=this.xyChart)?void 0:r.xAxisLabelColor)||this.primaryTextColor,xAxisTickColor:(null==(n=this.xyChart)?void 0:n.xAxisTickColor)||this.primaryTextColor,xAxisLineColor:(null==(o=this.xyChart)?void 0:o.xAxisLineColor)||this.primaryTextColor,yAxisTitleColor:(null==(a=this.xyChart)?void 0:a.yAxisTitleColor)||this.primaryTextColor,yAxisLabelColor:(null==(s=this.xyChart)?void 0:s.yAxisLabelColor)||this.primaryTextColor,yAxisTickColor:(null==(l=this.xyChart)?void 0:l.yAxisTickColor)||this.primaryTextColor,yAxisLineColor:(null==(c=this.xyChart)?void 0:c.yAxisLineColor)||this.primaryTextColor,plotColorPalette:(null==(u=this.xyChart)?void 0:u.plotColorPalette)||"#CDE498,#FF6B6B,#A0D2DB,#D7BDE2,#F0F0F0,#FFC3A0,#7FD8BE,#FF9A8B,#FAF3E0,#FFF176"},this.requirementBackground=this.requirementBackground||this.primaryColor,this.requirementBorderColor=this.requirementBorderColor||this.primaryBorderColor,this.requirementBorderSize=this.requirementBorderSize||"1",this.requirementTextColor=this.requirementTextColor||this.primaryTextColor,this.relationColor=this.relationColor||this.lineColor,this.relationLabelBackground=this.relationLabelBackground||this.edgeLabelBackground,this.relationLabelColor=this.relationLabelColor||this.actorTextColor,this.git0=this.git0||this.primaryColor,this.git1=this.git1||this.secondaryColor,this.git2=this.git2||this.tertiaryColor,this.git3=this.git3||h(this.primaryColor,{h:-30}),this.git4=this.git4||h(this.primaryColor,{h:-60}),this.git5=this.git5||h(this.primaryColor,{h:-90}),this.git6=this.git6||h(this.primaryColor,{h:60}),this.git7=this.git7||h(this.primaryColor,{h:120}),this.darkMode?(this.git0=(0,g.Z)(this.git0,25),this.git1=(0,g.Z)(this.git1,25),this.git2=(0,g.Z)(this.git2,25),this.git3=(0,g.Z)(this.git3,25),this.git4=(0,g.Z)(this.git4,25),this.git5=(0,g.Z)(this.git5,25),this.git6=(0,g.Z)(this.git6,25),this.git7=(0,g.Z)(this.git7,25)):(this.git0=(0,p.Z)(this.git0,25),this.git1=(0,p.Z)(this.git1,25),this.git2=(0,p.Z)(this.git2,25),this.git3=(0,p.Z)(this.git3,25),this.git4=(0,p.Z)(this.git4,25),this.git5=(0,p.Z)(this.git5,25),this.git6=(0,p.Z)(this.git6,25),this.git7=(0,p.Z)(this.git7,25)),this.gitInv0=this.gitInv0||f(this.git0),this.gitInv1=this.gitInv1||f(this.git1),this.gitInv2=this.gitInv2||f(this.git2),this.gitInv3=this.gitInv3||f(this.git3),this.gitInv4=this.gitInv4||f(this.git4),this.gitInv5=this.gitInv5||f(this.git5),this.gitInv6=this.gitInv6||f(this.git6),this.gitInv7=this.gitInv7||f(this.git7),this.gitBranchLabel0=this.gitBranchLabel0||f(this.labelTextColor),this.gitBranchLabel1=this.gitBranchLabel1||this.labelTextColor,this.gitBranchLabel2=this.gitBranchLabel2||this.labelTextColor,this.gitBranchLabel3=this.gitBranchLabel3||f(this.labelTextColor),this.gitBranchLabel4=this.gitBranchLabel4||this.labelTextColor,this.gitBranchLabel5=this.gitBranchLabel5||this.labelTextColor,this.gitBranchLabel6=this.gitBranchLabel6||this.labelTextColor,this.gitBranchLabel7=this.gitBranchLabel7||this.labelTextColor,this.tagLabelColor=this.tagLabelColor||this.primaryTextColor,this.tagLabelBackground=this.tagLabelBackground||this.primaryColor,this.tagLabelBorder=this.tagBorder||this.primaryBorderColor,this.tagLabelFontSize=this.tagLabelFontSize||"10px",this.commitLabelColor=this.commitLabelColor||this.secondaryTextColor,this.commitLabelBackground=this.commitLabelBackground||this.secondaryColor,this.commitLabelFontSize=this.commitLabelFontSize||"10px",this.attributeBackgroundColorOdd=this.attributeBackgroundColorOdd||kt,this.attributeBackgroundColorEven=this.attributeBackgroundColorEven||Tt}calculate(t){if("object"!=typeof t)return void this.updateColors();const e=Object.keys(t);e.forEach((e=>{this[e]=t[e]})),this.updateColors(),e.forEach((e=>{this[e]=t[e]}))}};class Lt{constructor(){this.primaryColor="#eee",this.contrast="#707070",this.secondaryColor=(0,g.Z)(this.contrast,55),this.background="#ffffff",this.tertiaryColor=h(this.primaryColor,{h:-160}),this.primaryBorderColor=vt(this.primaryColor,this.darkMode),this.secondaryBorderColor=vt(this.secondaryColor,this.darkMode),this.tertiaryBorderColor=vt(this.tertiaryColor,this.darkMode),this.primaryTextColor=f(this.primaryColor),this.secondaryTextColor=f(this.secondaryColor),this.tertiaryTextColor=f(this.tertiaryColor),this.lineColor=f(this.background),this.textColor=f(this.background),this.mainBkg="#eee",this.secondBkg="calculated",this.lineColor="#666",this.border1="#999",this.border2="calculated",this.note="#ffa",this.text="#333",this.critical="#d42",this.done="#bbb",this.arrowheadColor="#333333",this.fontFamily='"trebuchet ms", verdana, arial, sans-serif',this.fontSize="16px",this.THEME_COLOR_LIMIT=12,this.nodeBkg="calculated",this.nodeBorder="calculated",this.clusterBkg="calculated",this.clusterBorder="calculated",this.defaultLinkColor="calculated",this.titleColor="calculated",this.edgeLabelBackground="white",this.actorBorder="calculated",this.actorBkg="calculated",this.actorTextColor="calculated",this.actorLineColor="calculated",this.signalColor="calculated",this.signalTextColor="calculated",this.labelBoxBkgColor="calculated",this.labelBoxBorderColor="calculated",this.labelTextColor="calculated",this.loopTextColor="calculated",this.noteBorderColor="calculated",this.noteBkgColor="calculated",this.noteTextColor="calculated",this.activationBorderColor="#666",this.activationBkgColor="#f4f4f4",this.sequenceNumberColor="white",this.sectionBkgColor="calculated",this.altSectionBkgColor="white",this.sectionBkgColor2="calculated",this.excludeBkgColor="#eeeeee",this.taskBorderColor="calculated",this.taskBkgColor="calculated",this.taskTextLightColor="white",this.taskTextColor="calculated",this.taskTextDarkColor="calculated",this.taskTextOutsideColor="calculated",this.taskTextClickableColor="#003163",this.activeTaskBorderColor="calculated",this.activeTaskBkgColor="calculated",this.gridColor="calculated",this.doneTaskBkgColor="calculated",this.doneTaskBorderColor="calculated",this.critBkgColor="calculated",this.critBorderColor="calculated",this.todayLineColor="calculated",this.personBorder=this.primaryBorderColor,this.personBkg=this.mainBkg,this.labelColor="black",this.errorBkgColor="#552222",this.errorTextColor="#552222"}updateColors(){var t,e,i,r,n,o,a,s,l,c,u;this.secondBkg=(0,g.Z)(this.contrast,55),this.border2=this.contrast,this.actorBorder=(0,g.Z)(this.border1,23),this.actorBkg=this.mainBkg,this.actorTextColor=this.text,this.actorLineColor=this.lineColor,this.signalColor=this.text,this.signalTextColor=this.text,this.labelBoxBkgColor=this.actorBkg,this.labelBoxBorderColor=this.actorBorder,this.labelTextColor=this.text,this.loopTextColor=this.text,this.noteBorderColor="#999",this.noteBkgColor="#666",this.noteTextColor="#fff",this.cScale0=this.cScale0||"#555",this.cScale1=this.cScale1||"#F4F4F4",this.cScale2=this.cScale2||"#555",this.cScale3=this.cScale3||"#BBB",this.cScale4=this.cScale4||"#777",this.cScale5=this.cScale5||"#999",this.cScale6=this.cScale6||"#DDD",this.cScale7=this.cScale7||"#FFF",this.cScale8=this.cScale8||"#DDD",this.cScale9=this.cScale9||"#BBB",this.cScale10=this.cScale10||"#999",this.cScale11=this.cScale11||"#777";for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleInv"+h]=this["cScaleInv"+h]||f(this["cScale"+h]);for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this.darkMode?this["cScalePeer"+h]=this["cScalePeer"+h]||(0,g.Z)(this["cScale"+h],10):this["cScalePeer"+h]=this["cScalePeer"+h]||(0,p.Z)(this["cScale"+h],10);this.scaleLabelColor=this.scaleLabelColor||(this.darkMode?"black":this.labelTextColor),this.cScaleLabel0=this.cScaleLabel0||this.cScale1,this.cScaleLabel2=this.cScaleLabel2||this.cScale1;for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["cScaleLabel"+h]=this["cScaleLabel"+h]||this.scaleLabelColor;for(let d=0;d<5;d++)this["surface"+d]=this["surface"+d]||h(this.mainBkg,{l:-(5+5*d)}),this["surfacePeer"+d]=this["surfacePeer"+d]||h(this.mainBkg,{l:-(8+5*d)});this.nodeBkg=this.mainBkg,this.nodeBorder=this.border1,this.clusterBkg=this.secondBkg,this.clusterBorder=this.border2,this.defaultLinkColor=this.lineColor,this.titleColor=this.text,this.sectionBkgColor=(0,g.Z)(this.contrast,30),this.sectionBkgColor2=(0,g.Z)(this.contrast,30),this.taskBorderColor=(0,p.Z)(this.contrast,10),this.taskBkgColor=this.contrast,this.taskTextColor=this.taskTextLightColor,this.taskTextDarkColor=this.text,this.taskTextOutsideColor=this.taskTextDarkColor,this.activeTaskBorderColor=this.taskBorderColor,this.activeTaskBkgColor=this.mainBkg,this.gridColor=(0,g.Z)(this.border1,30),this.doneTaskBkgColor=this.done,this.doneTaskBorderColor=this.lineColor,this.critBkgColor=this.critical,this.critBorderColor=(0,p.Z)(this.critBkgColor,10),this.todayLineColor=this.critBkgColor,this.transitionColor=this.transitionColor||"#000",this.transitionLabelColor=this.transitionLabelColor||this.textColor,this.stateLabelColor=this.stateLabelColor||this.stateBkg||this.primaryTextColor,this.stateBkg=this.stateBkg||this.mainBkg,this.labelBackgroundColor=this.labelBackgroundColor||this.stateBkg,this.compositeBackground=this.compositeBackground||this.background||this.tertiaryColor,this.altBackground=this.altBackground||"#f4f4f4",this.compositeTitleBackground=this.compositeTitleBackground||this.mainBkg,this.stateBorder=this.stateBorder||"#000",this.innerEndBackground=this.primaryBorderColor,this.specialStateColor="#222",this.errorBkgColor=this.errorBkgColor||this.tertiaryColor,this.errorTextColor=this.errorTextColor||this.tertiaryTextColor,this.classText=this.primaryTextColor,this.fillType0=this.primaryColor,this.fillType1=this.secondaryColor,this.fillType2=h(this.primaryColor,{h:64}),this.fillType3=h(this.secondaryColor,{h:64}),this.fillType4=h(this.primaryColor,{h:-64}),this.fillType5=h(this.secondaryColor,{h:-64}),this.fillType6=h(this.primaryColor,{h:128}),this.fillType7=h(this.secondaryColor,{h:128});for(let h=0;h<this.THEME_COLOR_LIMIT;h++)this["pie"+h]=this["cScale"+h];this.pie12=this.pie0,this.pieTitleTextSize=this.pieTitleTextSize||"25px",this.pieTitleTextColor=this.pieTitleTextColor||this.taskTextDarkColor,this.pieSectionTextSize=this.pieSectionTextSize||"17px",this.pieSectionTextColor=this.pieSectionTextColor||this.textColor,this.pieLegendTextSize=this.pieLegendTextSize||"17px",this.pieLegendTextColor=this.pieLegendTextColor||this.taskTextDarkColor,this.pieStrokeColor=this.pieStrokeColor||"black",this.pieStrokeWidth=this.pieStrokeWidth||"2px",this.pieOuterStrokeWidth=this.pieOuterStrokeWidth||"2px",this.pieOuterStrokeColor=this.pieOuterStrokeColor||"black",this.pieOpacity=this.pieOpacity||"0.7",this.quadrant1Fill=this.quadrant1Fill||this.primaryColor,this.quadrant2Fill=this.quadrant2Fill||h(this.primaryColor,{r:5,g:5,b:5}),this.quadrant3Fill=this.quadrant3Fill||h(this.primaryColor,{r:10,g:10,b:10}),this.quadrant4Fill=this.quadrant4Fill||h(this.primaryColor,{r:15,g:15,b:15}),this.quadrant1TextFill=this.quadrant1TextFill||this.primaryTextColor,this.quadrant2TextFill=this.quadrant2TextFill||h(this.primaryTextColor,{r:-5,g:-5,b:-5}),this.quadrant3TextFill=this.quadrant3TextFill||h(this.primaryTextColor,{r:-10,g:-10,b:-10}),this.quadrant4TextFill=this.quadrant4TextFill||h(this.primaryTextColor,{r:-15,g:-15,b:-15}),this.quadrantPointFill=this.quadrantPointFill||(0,m.Z)(this.quadrant1Fill)?(0,g.Z)(this.quadrant1Fill):(0,p.Z)(this.quadrant1Fill),this.quadrantPointTextFill=this.quadrantPointTextFill||this.primaryTextColor,this.quadrantXAxisTextFill=this.quadrantXAxisTextFill||this.primaryTextColor,this.quadrantYAxisTextFill=this.quadrantYAxisTextFill||this.primaryTextColor,this.quadrantInternalBorderStrokeFill=this.quadrantInternalBorderStrokeFill||this.primaryBorderColor,this.quadrantExternalBorderStrokeFill=this.quadrantExternalBorderStrokeFill||this.primaryBorderColor,this.quadrantTitleFill=this.quadrantTitleFill||this.primaryTextColor,this.xyChart={backgroundColor:(null==(t=this.xyChart)?void 0:t.backgroundColor)||this.background,titleColor:(null==(e=this.xyChart)?void 0:e.titleColor)||this.primaryTextColor,xAxisTitleColor:(null==(i=this.xyChart)?void 0:i.xAxisTitleColor)||this.primaryTextColor,xAxisLabelColor:(null==(r=this.xyChart)?void 0:r.xAxisLabelColor)||this.primaryTextColor,xAxisTickColor:(null==(n=this.xyChart)?void 0:n.xAxisTickColor)||this.primaryTextColor,xAxisLineColor:(null==(o=this.xyChart)?void 0:o.xAxisLineColor)||this.primaryTextColor,yAxisTitleColor:(null==(a=this.xyChart)?void 0:a.yAxisTitleColor)||this.primaryTextColor,yAxisLabelColor:(null==(s=this.xyChart)?void 0:s.yAxisLabelColor)||this.primaryTextColor,yAxisTickColor:(null==(l=this.xyChart)?void 0:l.yAxisTickColor)||this.primaryTextColor,yAxisLineColor:(null==(c=this.xyChart)?void 0:c.yAxisLineColor)||this.primaryTextColor,plotColorPalette:(null==(u=this.xyChart)?void 0:u.plotColorPalette)||"#EEE,#6BB8E4,#8ACB88,#C7ACD6,#E8DCC2,#FFB2A8,#FFF380,#7E8D91,#FFD8B1,#FAF3E0"},this.requirementBackground=this.requirementBackground||this.primaryColor,this.requirementBorderColor=this.requirementBorderColor||this.primaryBorderColor,this.requirementBorderSize=this.requirementBorderSize||"1",this.requirementTextColor=this.requirementTextColor||this.primaryTextColor,this.relationColor=this.relationColor||this.lineColor,this.relationLabelBackground=this.relationLabelBackground||this.edgeLabelBackground,this.relationLabelColor=this.relationLabelColor||this.actorTextColor,this.git0=(0,p.Z)(this.pie1,25)||this.primaryColor,this.git1=this.pie2||this.secondaryColor,this.git2=this.pie3||this.tertiaryColor,this.git3=this.pie4||h(this.primaryColor,{h:-30}),this.git4=this.pie5||h(this.primaryColor,{h:-60}),this.git5=this.pie6||h(this.primaryColor,{h:-90}),this.git6=this.pie7||h(this.primaryColor,{h:60}),this.git7=this.pie8||h(this.primaryColor,{h:120}),this.gitInv0=this.gitInv0||f(this.git0),this.gitInv1=this.gitInv1||f(this.git1),this.gitInv2=this.gitInv2||f(this.git2),this.gitInv3=this.gitInv3||f(this.git3),this.gitInv4=this.gitInv4||f(this.git4),this.gitInv5=this.gitInv5||f(this.git5),this.gitInv6=this.gitInv6||f(this.git6),this.gitInv7=this.gitInv7||f(this.git7),this.branchLabelColor=this.branchLabelColor||this.labelTextColor,this.gitBranchLabel0=this.branchLabelColor,this.gitBranchLabel1="white",this.gitBranchLabel2=this.branchLabelColor,this.gitBranchLabel3="white",this.gitBranchLabel4=this.branchLabelColor,this.gitBranchLabel5=this.branchLabelColor,this.gitBranchLabel6=this.branchLabelColor,this.gitBranchLabel7=this.branchLabelColor,this.tagLabelColor=this.tagLabelColor||this.primaryTextColor,this.tagLabelBackground=this.tagLabelBackground||this.primaryColor,this.tagLabelBorder=this.tagBorder||this.primaryBorderColor,this.tagLabelFontSize=this.tagLabelFontSize||"10px",this.commitLabelColor=this.commitLabelColor||this.secondaryTextColor,this.commitLabelBackground=this.commitLabelBackground||this.secondaryColor,this.commitLabelFontSize=this.commitLabelFontSize||"10px",this.attributeBackgroundColorOdd=this.attributeBackgroundColorOdd||kt,this.attributeBackgroundColorEven=this.attributeBackgroundColorEven||Tt}calculate(t){if("object"!=typeof t)return void this.updateColors();const e=Object.keys(t);e.forEach((e=>{this[e]=t[e]})),this.updateColors(),e.forEach((e=>{this[e]=t[e]}))}}const Mt={base:{getThemeVariables:t=>{const e=new wt;return e.calculate(t),e}},dark:{getThemeVariables:t=>{const e=new St;return e.calculate(t),e}},default:{getThemeVariables:Ft},forest:{getThemeVariables:t=>{const e=new At;return e.calculate(t),e}},neutral:{getThemeVariables:t=>{const e=new Lt;return e.calculate(t),e}}},Et={flowchart:{useMaxWidth:!0,titleTopMargin:25,diagramPadding:8,htmlLabels:!0,nodeSpacing:50,rankSpacing:50,curve:"basis",padding:15,defaultRenderer:"dagre-wrapper",wrappingWidth:200},sequence:{useMaxWidth:!0,hideUnusedParticipants:!1,activationWidth:10,diagramMarginX:50,diagramMarginY:10,actorMargin:50,width:150,height:65,boxMargin:10,boxTextMargin:5,noteMargin:10,messageMargin:35,messageAlign:"center",mirrorActors:!0,forceMenus:!1,bottomMarginAdj:1,rightAngles:!1,showSequenceNumbers:!1,actorFontSize:14,actorFontFamily:'"Open Sans", sans-serif',actorFontWeight:400,noteFontSize:14,noteFontFamily:'"trebuchet ms", verdana, arial, sans-serif',noteFontWeight:400,noteAlign:"center",messageFontSize:16,messageFontFamily:'"trebuchet ms", verdana, arial, sans-serif',messageFontWeight:400,wrap:!1,wrapPadding:10,labelBoxWidth:50,labelBoxHeight:20},gantt:{useMaxWidth:!0,titleTopMargin:25,barHeight:20,barGap:4,topPadding:50,rightPadding:75,leftPadding:75,gridLineStartPadding:35,fontSize:11,sectionFontSize:11,numberSectionStyles:4,axisFormat:"%Y-%m-%d",topAxis:!1,displayMode:"",weekday:"sunday"},journey:{useMaxWidth:!0,diagramMarginX:50,diagramMarginY:10,leftMargin:150,width:150,height:50,boxMargin:10,boxTextMargin:5,noteMargin:10,messageMargin:35,messageAlign:"center",bottomMarginAdj:1,rightAngles:!1,taskFontSize:14,taskFontFamily:'"Open Sans", sans-serif',taskMargin:50,activationWidth:10,textPlacement:"fo",actorColours:["#8FBC8F","#7CFC00","#00FFFF","#20B2AA","#B0E0E6","#FFFFE0"],sectionFills:["#191970","#8B008B","#4B0082","#2F4F4F","#800000","#8B4513","#00008B"],sectionColours:["#fff"]},class:{useMaxWidth:!0,titleTopMargin:25,arrowMarkerAbsolute:!1,dividerMargin:10,padding:5,textHeight:10,defaultRenderer:"dagre-wrapper",htmlLabels:!1},state:{useMaxWidth:!0,titleTopMargin:25,dividerMargin:10,sizeUnit:5,padding:8,textHeight:10,titleShift:-15,noteMargin:10,forkWidth:70,forkHeight:7,miniPadding:2,fontSizeFactor:5.02,fontSize:24,labelHeight:16,edgeLengthFactor:"20",compositTitleSize:35,radius:5,defaultRenderer:"dagre-wrapper"},er:{useMaxWidth:!0,titleTopMargin:25,diagramPadding:20,layoutDirection:"TB",minEntityWidth:100,minEntityHeight:75,entityPadding:15,stroke:"gray",fill:"honeydew",fontSize:12},pie:{useMaxWidth:!0,textPosition:.75},quadrantChart:{useMaxWidth:!0,chartWidth:500,chartHeight:500,titleFontSize:20,titlePadding:10,quadrantPadding:5,xAxisLabelPadding:5,yAxisLabelPadding:5,xAxisLabelFontSize:16,yAxisLabelFontSize:16,quadrantLabelFontSize:16,quadrantTextTopPadding:5,pointTextPadding:5,pointLabelFontSize:12,pointRadius:5,xAxisPosition:"top",yAxisPosition:"left",quadrantInternalBorderStrokeWidth:1,quadrantExternalBorderStrokeWidth:2},xyChart:{useMaxWidth:!0,width:700,height:500,titleFontSize:20,titlePadding:10,showTitle:!0,xAxis:{$ref:"#/$defs/XYChartAxisConfig",showLabel:!0,labelFontSize:14,labelPadding:5,showTitle:!0,titleFontSize:16,titlePadding:5,showTick:!0,tickLength:5,tickWidth:2,showAxisLine:!0,axisLineWidth:2},yAxis:{$ref:"#/$defs/XYChartAxisConfig",showLabel:!0,labelFontSize:14,labelPadding:5,showTitle:!0,titleFontSize:16,titlePadding:5,showTick:!0,tickLength:5,tickWidth:2,showAxisLine:!0,axisLineWidth:2},chartOrientation:"vertical",plotReservedSpacePercent:50},requirement:{useMaxWidth:!0,rect_fill:"#f9f9f9",text_color:"#333",rect_border_size:"0.5px",rect_border_color:"#bbb",rect_min_width:200,rect_min_height:200,fontSize:14,rect_padding:10,line_height:20},mindmap:{useMaxWidth:!0,padding:10,maxNodeWidth:200},timeline:{useMaxWidth:!0,diagramMarginX:50,diagramMarginY:10,leftMargin:150,width:150,height:50,boxMargin:10,boxTextMargin:5,noteMargin:10,messageMargin:35,messageAlign:"center",bottomMarginAdj:1,rightAngles:!1,taskFontSize:14,taskFontFamily:'"Open Sans", sans-serif',taskMargin:50,activationWidth:10,textPlacement:"fo",actorColours:["#8FBC8F","#7CFC00","#00FFFF","#20B2AA","#B0E0E6","#FFFFE0"],sectionFills:["#191970","#8B008B","#4B0082","#2F4F4F","#800000","#8B4513","#00008B"],sectionColours:["#fff"],disableMulticolor:!1},gitGraph:{useMaxWidth:!0,titleTopMargin:25,diagramPadding:8,nodeLabel:{width:75,height:100,x:-25,y:0},mainBranchName:"main",mainBranchOrder:0,showCommitLabel:!0,showBranches:!0,rotateCommitLabel:!0,arrowMarkerAbsolute:!1},c4:{useMaxWidth:!0,diagramMarginX:50,diagramMarginY:10,c4ShapeMargin:50,c4ShapePadding:20,width:216,height:60,boxMargin:10,c4ShapeInRow:4,nextLinePaddingX:0,c4BoundaryInRow:2,personFontSize:14,personFontFamily:'"Open Sans", sans-serif',personFontWeight:"normal",external_personFontSize:14,external_personFontFamily:'"Open Sans", sans-serif',external_personFontWeight:"normal",systemFontSize:14,systemFontFamily:'"Open Sans", sans-serif',systemFontWeight:"normal",external_systemFontSize:14,external_systemFontFamily:'"Open Sans", sans-serif',external_systemFontWeight:"normal",system_dbFontSize:14,system_dbFontFamily:'"Open Sans", sans-serif',system_dbFontWeight:"normal",external_system_dbFontSize:14,external_system_dbFontFamily:'"Open Sans", sans-serif',external_system_dbFontWeight:"normal",system_queueFontSize:14,system_queueFontFamily:'"Open Sans", sans-serif',system_queueFontWeight:"normal",external_system_queueFontSize:14,external_system_queueFontFamily:'"Open Sans", sans-serif',external_system_queueFontWeight:"normal",boundaryFontSize:14,boundaryFontFamily:'"Open Sans", sans-serif',boundaryFontWeight:"normal",messageFontSize:12,messageFontFamily:'"Open Sans", sans-serif',messageFontWeight:"normal",containerFontSize:14,containerFontFamily:'"Open Sans", sans-serif',containerFontWeight:"normal",external_containerFontSize:14,external_containerFontFamily:'"Open Sans", sans-serif',external_containerFontWeight:"normal",container_dbFontSize:14,container_dbFontFamily:'"Open Sans", sans-serif',container_dbFontWeight:"normal",external_container_dbFontSize:14,external_container_dbFontFamily:'"Open Sans", sans-serif',external_container_dbFontWeight:"normal",container_queueFontSize:14,container_queueFontFamily:'"Open Sans", sans-serif',container_queueFontWeight:"normal",external_container_queueFontSize:14,external_container_queueFontFamily:'"Open Sans", sans-serif',external_container_queueFontWeight:"normal",componentFontSize:14,componentFontFamily:'"Open Sans", sans-serif',componentFontWeight:"normal",external_componentFontSize:14,external_componentFontFamily:'"Open Sans", sans-serif',external_componentFontWeight:"normal",component_dbFontSize:14,component_dbFontFamily:'"Open Sans", sans-serif',component_dbFontWeight:"normal",external_component_dbFontSize:14,external_component_dbFontFamily:'"Open Sans", sans-serif',external_component_dbFontWeight:"normal",component_queueFontSize:14,component_queueFontFamily:'"Open Sans", sans-serif',component_queueFontWeight:"normal",external_component_queueFontSize:14,external_component_queueFontFamily:'"Open Sans", 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",(0,r.jsx)(n.em,{children:"Merge Requests"})," for review."]}),"\n",(0,r.jsxs)(n.p,{children:["The rudimentary idea behind aims for changes to be present on a separate branch\nthat is supposedly ",(0,r.jsx)(n.em,{children:"merged"})," into the default branch. 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If you do not know what your default branch is, it is probably ",(0,r.jsx)(n.code,{children:"master"}),"\nand you should not be on any other branch."]}),"\n",(0,r.jsx)(n.p,{children:"Output of the command should look like this:"}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"aisa$ git status\nOn branch master # Or main or trunk.\nYour branch is up to date with 'origin/master'.\n\nnothing to commit, working tree clean\n"})}),"\n",(0,r.jsxs)(n.blockquote,{children:["\n",(0,r.jsxs)(n.p,{children:["In case you are on different branch or there are uncommitted changes,\n",(0,r.jsx)(n.strong,{children:"do not continue!!!"})," Clean your repository (commit the changes or discard\nthem), before you continue."]}),"\n"]}),"\n",(0,r.jsx)(n.h3,{id:"step-2---create-new-branch",children:"Step #2 - Create new branch"}),"\n",(0,r.jsx)(n.p,{children:"In your repository write command:"}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"aisa$ git checkout -b BRANCH\nSwitched to a new branch 'BRANCH'\n"})}),"\n",(0,r.jsxs)(n.p,{children:["Instead of ",(0,r.jsx)(n.code,{children:"BRANCH"})," use some reasonable name for the branch. For example if you\nare working on the seminar from 3rd week, name the branch ",(0,r.jsx)(n.code,{children:"seminar-03"}),"."]}),"\n",(0,r.jsx)(n.h3,{id:"step-3---do-the-assignment",children:"Step #3 - Do the assignment"}),"\n",(0,r.jsx)(n.p,{children:"Download the skeleton for the seminar assignment, extract and program. For example\nif you are working on 3rd seminar, you can do so by:"}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"aisa$ wget https://www.fi.muni.cz/pb071/seminars/seminar-03/pb071-seminar-03.zip\naisa$ unzip pb071-seminar-03.zip\n# Now you should have directory 'seminar-03'.\naisa$ rm pb071-seminar-03.zip\naisa$ cd seminar-03\n# You can work on the assignment.\n"})}),"\n",(0,r.jsx)(n.h3,{id:"step-4---commit-and-upload-the-changes-to-gitlab",children:"Step #4 - Commit and upload the changes to GitLab"}),"\n",(0,r.jsxs)(n.p,{children:["The same way you ",(0,r.jsx)(n.em,{children:"add"})," and ",(0,r.jsx)(n.em,{children:"commit"})," files for the homework assignments, you do for\nthe seminar."]}),"\n",(0,r.jsxs)(n.p,{children:["Now you can upload the changes to GitLab. ",(0,r.jsx)(n.code,{children:"git push"})," is not enough, since repository\non GitLab does not know your new branch. You can solve this by adding arguments:"]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"aisa$ git push origin BRANCH\n...\nremote: To create a merge request for BRANCH, visit:\nremote: https://gitlab.fi.muni.cz/login/pb071/merge_requests/new?merge_request%5Bsource_branch%5D=BRANCH\n...\n"})}),"\n",(0,r.jsx)(n.p,{children:"In the output you should have a link for creating a merge request. If you see this\nlink, open it and skip next step."}),"\n",(0,r.jsx)(n.h3,{id:"step-5---creating-a-merge-request-manually",children:"Step #5 - Creating a merge request manually"}),"\n",(0,r.jsxs)(n.ol,{children:["\n",(0,r.jsx)(n.li,{children:"Open your repository on GitLab."}),"\n",(0,r.jsxs)(n.li,{children:["On the left panel click on ",(0,r.jsx)(n.em,{children:"Merge Requests"}),"."]}),"\n",(0,r.jsxs)(n.li,{children:["Click on ",(0,r.jsx)(n.em,{children:"New Merge Request"}),"."]}),"\n",(0,r.jsxs)(n.li,{children:["In ",(0,r.jsx)(n.em,{children:"Source branch"})," select ",(0,r.jsx)(n.code,{children:"login/pb071"})," and ",(0,r.jsx)(n.code,{children:"BRANCH"}),", which you created."]}),"\n",(0,r.jsxs)(n.li,{children:["In ",(0,r.jsx)(n.em,{children:"Target branch"})," select ",(0,r.jsx)(n.code,{children:"login/pb071"})," and your default branch you have seen\nin the output of the first command. (most likely ",(0,r.jsx)(n.code,{children:"master"}),")"]}),"\n",(0,r.jsxs)(n.li,{children:["Click on ",(0,r.jsx)(n.em,{children:"Compare branches and continue"}),"."]}),"\n"]}),"\n",(0,r.jsx)(n.h3,{id:"step-6---set-assignees",children:"Step #6 - Set assignees"}),"\n",(0,r.jsxs)(n.p,{children:["On the page that is opened, please check at the top that you are creating merge\nrequest ",(0,r.jsx)(n.strong,{children:"from"})," your new branch ",(0,r.jsx)(n.strong,{children:"to"})," your default branch (one of ",(0,r.jsx)(n.code,{children:"master"}),", ",(0,r.jsx)(n.code,{children:"main"}),"\nor ",(0,r.jsx)(n.code,{children:"trunk"}),")."]}),"\n",(0,r.jsxs)(n.p,{children:["Then in the field ",(0,r.jsx)(n.em,{children:"Assignees"})," set your tutors based on the seminar group. You can\nuse login for a quick look up."]}),"\n",(0,r.jsxs)(n.p,{children:["In the end click on ",(0,r.jsx)(n.em,{children:"Submit merge request"}),"."]}),"\n",(0,r.jsx)(n.h3,{id:"step-7---return-to-default-branch",children:"Step #7 - Return to default branch"}),"\n",(0,r.jsx)(n.p,{children:"Homework assignments can be submitted only from branches specified in the rules\nfor the course. Because of that, before you do anything else, you should switch\nback to your default branch."}),"\n",(0,r.jsxs)(n.p,{children:["First of all, same as in step #1, check that your repository is clean with ",(0,r.jsx)(n.code,{children:"git status"}),".\nFor the sake of safety, do not continue without clean repository. Then with command\n",(0,r.jsx)(n.code,{children:"git checkout BRANCH"})," switch to your default branch ",(0,r.jsx)(n.code,{children:"BRANCH"}),"."]}),"\n",(0,r.jsxs)(n.p,{children:["If you do not know which branch is your default, try ",(0,r.jsx)(n.code,{children:"git branch"})," that outputs all branches in your repository. Default branch is typically ",(0,r.jsx)(n.code,{children:"master"}),", but can\nbe ",(0,r.jsx)(n.code,{children:"main"})," or ",(0,r.jsx)(n.code,{children:"trunk"}),"."]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"aisa$ git status\n# Check if repository is clean\n\n# If you know, what is your default branch, you can skip next command.\naisa$ git branch\n# Find the default branch in the list; should be one of the `master`, `main` or\n# `trunk` and you should not have more than one of those.\n# In case the list clears the terminal and you cannot see shell prompt, you can\n# press `q` to quit the pager.\n\naisa$ git checkout master\n"})}),"\n",(0,r.jsx)(n.hr,{}),"\n",(0,r.jsxs)(n.p,{children:["Adapted from: ",(0,r.jsx)(n.a,{href:"https://www.fi.muni.cz/~xlacko1/pb071/mr.html",children:"https://www.fi.muni.cz/~xlacko1/pb071/mr.html"})]})]})}function d(e={}){const{wrapper:n}={...(0,s.a)(),...e.components};return n?(0,r.jsx)(n,{...e,children:(0,r.jsx)(l,{...e})}):l(e)}},11151:(e,n,t)=>{t.d(n,{Z:()=>a,a:()=>i});var r=t(67294);const s={},o=r.createContext(s);function i(e){const n=r.useContext(o);return r.useMemo((function(){return"function"==typeof e?e(n):{...n,...e}}),[n,e])}function a(e){let n;return n=e.disableParentContext?"function"==typeof e.components?e.components(s):e.components||s:i(e.components),r.createElement(o.Provider,{value:n},e.children)}}}]); \ No newline at end of file diff --git a/assets/js/b1288602.cc4934c1.js b/assets/js/b1288602.cc4934c1.js deleted file mode 100644 index 2f2d02c..0000000 --- a/assets/js/b1288602.cc4934c1.js +++ /dev/null @@ -1 +0,0 @@ -"use strict";(self.webpackChunkfi=self.webpackChunkfi||[]).push([[59],{51456:(e,n,t)=>{t.r(n),t.d(n,{assets:()=>c,contentTitle:()=>i,default:()=>d,frontMatter:()=>o,metadata:()=>a,toc:()=>h});var r=t(85893),s=t(11151);const o={title:"Submitting merge requests"},i="Submitting merge requests for review",a={id:"mr",title:"Submitting merge requests",description:"This tutorial aims to show you how to follow basic git workflow and submit changes",source:"@site/c/mr.md",sourceDirName:".",slug:"/mr",permalink:"/c/mr",draft:!1,unlisted:!1,editUrl:"https://github.com/mfocko/blog/tree/main/c/mr.md",tags:[],version:"current",lastUpdatedAt:1704571953,formattedLastUpdatedAt:"Jan 6, 2024",frontMatter:{title:"Submitting merge requests"},sidebar:"autogeneratedBar",previous:{title:"Practice exam C",permalink:"/c/pexam/cams"}},c={},h=[{value:"Tutorial",id:"tutorial",level:2},{value:"Step #1 - Starting from the clean repository",id:"step-1---starting-from-the-clean-repository",level:3},{value:"Step #2 - Create new branch",id:"step-2---create-new-branch",level:3},{value:"Step #3 - Do the assignment",id:"step-3---do-the-assignment",level:3},{value:"Step #4 - Commit and upload the changes to GitLab",id:"step-4---commit-and-upload-the-changes-to-gitlab",level:3},{value:"Step #5 - Creating a merge request manually",id:"step-5---creating-a-merge-request-manually",level:3},{value:"Step #6 - Set assignees",id:"step-6---set-assignees",level:3},{value:"Step #7 - Return to default branch",id:"step-7---return-to-default-branch",level:3}];function l(e){const n={a:"a",blockquote:"blockquote",code:"code",em:"em",h1:"h1",h2:"h2",h3:"h3",hr:"hr",li:"li",ol:"ol",p:"p",pre:"pre",strong:"strong",...(0,s.a)(),...e.components};return(0,r.jsxs)(r.Fragment,{children:[(0,r.jsx)(n.h1,{id:"submitting-merge-requests-for-review",children:"Submitting merge requests for review"}),"\n",(0,r.jsxs)(n.p,{children:["This tutorial aims to show you how to follow basic git workflow and submit changes\nthrough ",(0,r.jsx)(n.em,{children:"Merge Requests"})," for review."]}),"\n",(0,r.jsxs)(n.p,{children:["The rudimentary idea behind aims for changes to be present on a separate branch\nthat is supposedly ",(0,r.jsx)(n.em,{children:"merged"})," into the default branch. Till then changes can be reviewed\non ",(0,r.jsx)(n.em,{children:"Merge Request"})," and additional changes may be made based on the reviews. Once\nthe changes satisfy requirements, the merge request is merged."]}),"\n",(0,r.jsx)(n.h2,{id:"tutorial",children:"Tutorial"}),"\n",(0,r.jsxs)(n.blockquote,{children:["\n",(0,r.jsxs)(n.p,{children:["Use this tutorial only for bonus assignments ",(0,r.jsx)(n.strong,{children:"made by your tutors"})," or in case\nyou need to make up for the absence."]}),"\n"]}),"\n",(0,r.jsx)(n.h3,{id:"step-1---starting-from-the-clean-repository",children:"Step #1 - Starting from the clean repository"}),"\n",(0,r.jsxs)(n.p,{children:["In your repository (either locally or on aisa) type ",(0,r.jsx)(n.code,{children:"git status"})," and check if your\nrepository is clean and you are present on the main branch (",(0,r.jsx)(n.code,{children:"master"}),", ",(0,r.jsx)(n.code,{children:"main"})," or\n",(0,r.jsx)(n.code,{children:"trunk"}),"). If you do not know what your default branch is, it is probably ",(0,r.jsx)(n.code,{children:"master"}),"\nand you should not be on any other branch."]}),"\n",(0,r.jsx)(n.p,{children:"Output of the command should look like this:"}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"aisa$ git status\nOn branch master # Or main or trunk.\nYour branch is up to date with 'origin/master'.\n\nnothing to commit, working tree clean\n"})}),"\n",(0,r.jsxs)(n.blockquote,{children:["\n",(0,r.jsxs)(n.p,{children:["In case you are on different branch or there are uncommitted changes,\n",(0,r.jsx)(n.strong,{children:"do not continue!!!"})," Clean your repository (commit the changes or discard\nthem), before you continue."]}),"\n"]}),"\n",(0,r.jsx)(n.h3,{id:"step-2---create-new-branch",children:"Step #2 - Create new branch"}),"\n",(0,r.jsx)(n.p,{children:"In your repository write command:"}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"aisa$ git checkout -b BRANCH\nSwitched to a new branch 'BRANCH'\n"})}),"\n",(0,r.jsxs)(n.p,{children:["Instead of ",(0,r.jsx)(n.code,{children:"BRANCH"})," use some reasonable name for the branch. For example if you\nare working on the seminar from 3rd week, name the branch ",(0,r.jsx)(n.code,{children:"seminar-03"}),"."]}),"\n",(0,r.jsx)(n.h3,{id:"step-3---do-the-assignment",children:"Step #3 - Do the assignment"}),"\n",(0,r.jsx)(n.p,{children:"Download the skeleton for the seminar assignment, extract and program. For example\nif you are working on 3rd seminar, you can do so by:"}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"aisa$ wget https://www.fi.muni.cz/pb071/seminars/seminar-03/pb071-seminar-03.zip\naisa$ unzip pb071-seminar-03.zip\n# Now you should have directory 'seminar-03'.\naisa$ rm pb071-seminar-03.zip\naisa$ cd seminar-03\n# You can work on the assignment.\n"})}),"\n",(0,r.jsx)(n.h3,{id:"step-4---commit-and-upload-the-changes-to-gitlab",children:"Step #4 - Commit and upload the changes to GitLab"}),"\n",(0,r.jsxs)(n.p,{children:["The same way you ",(0,r.jsx)(n.em,{children:"add"})," and ",(0,r.jsx)(n.em,{children:"commit"})," files for the homework assignments, you do for\nthe seminar."]}),"\n",(0,r.jsxs)(n.p,{children:["Now you can upload the changes to GitLab. ",(0,r.jsx)(n.code,{children:"git push"})," is not enough, since repository\non GitLab does not know your new branch. You can solve this by adding arguments:"]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"aisa$ git push origin BRANCH\n...\nremote: To create a merge request for BRANCH, visit:\nremote: https://gitlab.fi.muni.cz/login/pb071/merge_requests/new?merge_request%5Bsource_branch%5D=BRANCH\n...\n"})}),"\n",(0,r.jsx)(n.p,{children:"In the output you should have a link for creating a merge request. If you see this\nlink, open it and skip next step."}),"\n",(0,r.jsx)(n.h3,{id:"step-5---creating-a-merge-request-manually",children:"Step #5 - Creating a merge request manually"}),"\n",(0,r.jsxs)(n.ol,{children:["\n",(0,r.jsx)(n.li,{children:"Open your repository on GitLab."}),"\n",(0,r.jsxs)(n.li,{children:["On the left panel click on ",(0,r.jsx)(n.em,{children:"Merge Requests"}),"."]}),"\n",(0,r.jsxs)(n.li,{children:["Click on ",(0,r.jsx)(n.em,{children:"New Merge Request"}),"."]}),"\n",(0,r.jsxs)(n.li,{children:["In ",(0,r.jsx)(n.em,{children:"Source branch"})," select ",(0,r.jsx)(n.code,{children:"login/pb071"})," and ",(0,r.jsx)(n.code,{children:"BRANCH"}),", which you created."]}),"\n",(0,r.jsxs)(n.li,{children:["In ",(0,r.jsx)(n.em,{children:"Target branch"})," select ",(0,r.jsx)(n.code,{children:"login/pb071"})," and your default branch you have seen\nin the output of the first command. (most likely ",(0,r.jsx)(n.code,{children:"master"}),")"]}),"\n",(0,r.jsxs)(n.li,{children:["Click on ",(0,r.jsx)(n.em,{children:"Compare branches and continue"}),"."]}),"\n"]}),"\n",(0,r.jsx)(n.h3,{id:"step-6---set-assignees",children:"Step #6 - Set assignees"}),"\n",(0,r.jsxs)(n.p,{children:["On the page that is opened, please check at the top that you are creating merge\nrequest ",(0,r.jsx)(n.strong,{children:"from"})," your new branch ",(0,r.jsx)(n.strong,{children:"to"})," your default branch (one of ",(0,r.jsx)(n.code,{children:"master"}),", ",(0,r.jsx)(n.code,{children:"main"}),"\nor ",(0,r.jsx)(n.code,{children:"trunk"}),")."]}),"\n",(0,r.jsxs)(n.p,{children:["Then in the field ",(0,r.jsx)(n.em,{children:"Assignees"})," set your tutors based on the seminar group. You can\nuse login for a quick look up."]}),"\n",(0,r.jsxs)(n.p,{children:["In the end click on ",(0,r.jsx)(n.em,{children:"Submit merge request"}),"."]}),"\n",(0,r.jsx)(n.h3,{id:"step-7---return-to-default-branch",children:"Step #7 - Return to default branch"}),"\n",(0,r.jsx)(n.p,{children:"Homework assignments can be submitted only from branches specified in the rules\nfor the course. Because of that, before you do anything else, you should switch\nback to your default branch."}),"\n",(0,r.jsxs)(n.p,{children:["First of all, same as in step #1, check that your repository is clean with ",(0,r.jsx)(n.code,{children:"git status"}),".\nFor the sake of safety, do not continue without clean repository. Then with command\n",(0,r.jsx)(n.code,{children:"git checkout BRANCH"})," switch to your default branch ",(0,r.jsx)(n.code,{children:"BRANCH"}),"."]}),"\n",(0,r.jsxs)(n.p,{children:["If you do not know which branch is your default, try ",(0,r.jsx)(n.code,{children:"git branch"})," that outputs all branches in your repository. Default branch is typically ",(0,r.jsx)(n.code,{children:"master"}),", but can\nbe ",(0,r.jsx)(n.code,{children:"main"})," or ",(0,r.jsx)(n.code,{children:"trunk"}),"."]}),"\n",(0,r.jsx)(n.pre,{children:(0,r.jsx)(n.code,{children:"aisa$ git status\n# Check if repository is clean\n\n# If you know, what is your default branch, you can skip next command.\naisa$ git branch\n# Find the default branch in the list; should be one of the `master`, `main` or\n# `trunk` and you should not have more than one of those.\n# In case the list clears the terminal and you cannot see shell prompt, you can\n# press `q` to quit the pager.\n\naisa$ git checkout master\n"})}),"\n",(0,r.jsx)(n.hr,{}),"\n",(0,r.jsxs)(n.p,{children:["Adapted from: ",(0,r.jsx)(n.a,{href:"https://www.fi.muni.cz/~xlacko1/pb071/mr.html",children:"https://www.fi.muni.cz/~xlacko1/pb071/mr.html"})]})]})}function d(e={}){const{wrapper:n}={...(0,s.a)(),...e.components};return n?(0,r.jsx)(n,{...e,children:(0,r.jsx)(l,{...e})}):l(e)}},11151:(e,n,t)=>{t.d(n,{Z:()=>a,a:()=>i});var r=t(67294);const s={},o=r.createContext(s);function i(e){const n=r.useContext(o);return r.useMemo((function(){return"function"==typeof e?e(n):{...n,...e}}),[n,e])}function a(e){let n;return n=e.disableParentContext?"function"==typeof e.components?e.components(s):e.components||s:i(e.components),r.createElement(o.Provider,{value:n},e.children)}}}]); \ No newline at end of file diff --git a/assets/js/b5a32f14.68cedca8.js b/assets/js/b5a32f14.68cedca8.js deleted file mode 100644 index 6ff6609..0000000 --- a/assets/js/b5a32f14.68cedca8.js +++ /dev/null @@ -1 +0,0 @@ -"use strict";(self.webpackChunkfi=self.webpackChunkfi||[]).push([[2433],{31976:(e,n,o)=>{o.r(n),o.d(n,{assets:()=>d,contentTitle:()=>a,default:()=>c,frontMatter:()=>s,metadata:()=>i,toc:()=>l});var t=o(85893),r=o(11151);const s={title:"How can Copr help with broken dependencies",description:"Copr comes to save you when maintainer doesn't care.",date:new Date("2023-08-02T00:00:00.000Z"),authors:[{key:"mf",title:"a.k.a. your opinionated admin"}],tags:["\ud83c\udfed","red-hat","copr","admin","vps"]},a=void 0,i={permalink:"/blog/2023/08/02/copr",editUrl:"https://github.com/mfocko/blog/tree/main/blog/2023-08-02-copr.md",source:"@site/blog/2023-08-02-copr.md",title:"How can Copr help with broken dependencies",description:"Copr comes to save you when maintainer doesn't care.",date:"2023-08-02T00:00:00.000Z",formattedDate:"August 2, 2023",tags:[{label:"\ud83c\udfed",permalink:"/blog/tags/\ud83c\udfed"},{label:"red-hat",permalink:"/blog/tags/red-hat"},{label:"copr",permalink:"/blog/tags/copr"},{label:"admin",permalink:"/blog/tags/admin"},{label:"vps",permalink:"/blog/tags/vps"}],readingTime:3.44,hasTruncateMarker:!0,authors:[{name:"Matej Focko",email:"me+blog@mfocko.xyz",title:"a.k.a. your opinionated admin",url:"https://gitlab.com/mfocko",imageURL:"https://github.com/mfocko.png",key:"mf"}],frontMatter:{title:"How can Copr help with broken dependencies",description:"Copr comes to save you when maintainer doesn't care.",date:"2023-08-02T00:00:00.000Z",authors:[{key:"mf",title:"a.k.a. your opinionated admin"}],tags:["\ud83c\udfed","red-hat","copr","admin","vps"]},unlisted:!1,nextItem:{title:"4th week of Advent of Code '22 in Rust",permalink:"/blog/aoc-2022/4th-week"}},d={authorsImageUrls:[void 0]},l=[{value:"How does Copr repositories work?",id:"how-does-copr-repositories-work",level:2},{value:"My issue",id:"my-issue",level:2},{value:"How can Copr help?",id:"how-can-copr-help",level:2},{value:"Conclusion",id:"conclusion",level:2}];function h(e){const n={a:"a",admonition:"admonition",code:"code",h2:"h2",li:"li",ol:"ol",p:"p",pre:"pre",section:"section",strong:"strong",sup:"sup",...(0,r.a)(),...e.components};return(0,t.jsxs)(t.Fragment,{children:[(0,t.jsx)(n.p,{children:"When you decide to run Fedora on your VPS, you might get screwed over by using\nrandom repositories\u2026"}),"\n",(0,t.jsxs)(n.p,{children:["When I \u201creserved\u201d my VPS",(0,t.jsx)(n.sup,{children:(0,t.jsx)(n.a,{href:"#user-content-fn-1-d4045e",id:"user-content-fnref-1-d4045e","data-footnote-ref":!0,"aria-describedby":"footnote-label",children:"1"})})," back in June '20, I slapped Fedora on it without\nthinking. I bet 99% of people would say that I'm crazy for doing such thing",(0,t.jsx)(n.sup,{children:(0,t.jsx)(n.a,{href:"#user-content-fn-2-d4045e",id:"user-content-fnref-2-d4045e","data-footnote-ref":!0,"aria-describedby":"footnote-label",children:"2"})}),",\n",(0,t.jsx)(n.strong,{children:"BUT"})," I've been using Fedora on my PCs for some time already and it felt very\nstable and natural to just use, even for VPS."]}),"\n",(0,t.jsxs)(n.p,{children:["One of the first things I've done was setting up a mail server. You may guess\nwhat's the fun part about having a mail server\u2026 Yes, it's all the spam you\nreceive and only then you realize how much \u201ccrap\u201d gets filtered on free mail\nservices. To battle this problem I chose to use\n",(0,t.jsx)(n.a,{href:"https://github.com/rspamd/rspamd",children:"rspamd"})," that had CentOS support, but someone\nhad a ",(0,t.jsx)(n.a,{href:"https://copr.fedorainfracloud.org/",children:"Copr"})," repository that I used to\ninstall it."]}),"\n",(0,t.jsx)(n.h2,{id:"how-does-copr-repositories-work",children:"How does Copr repositories work?"}),"\n",(0,t.jsxs)(n.p,{children:["If you have ever used Ubuntu, you might be familiar with the concept since it is\nvery close to ",(0,t.jsx)(n.a,{href:"https://help.ubuntu.com/community/PPA",children:"PPAs"}),"."]}),"\n",(0,t.jsx)(n.p,{children:"tl;dr of the whole process consists of"}),"\n",(0,t.jsxs)(n.ol,{children:["\n",(0,t.jsx)(n.li,{children:"enabling the Copr repository, and"}),"\n",(0,t.jsx)(n.li,{children:"installing the desired package."}),"\n"]}),"\n",(0,t.jsx)(n.p,{children:"So in shell you would do"}),"\n",(0,t.jsx)(n.pre,{children:(0,t.jsx)(n.code,{children:"# dnf copr enable \u2039copr-repository\u203a\n# dnf install \u2039package-from-the-repository\u203a\n"})}),"\n",(0,t.jsx)(n.p,{children:"And\u2026 that's it! Nothing else needed! Simple, right? And literally same process\nas you would do for the PPA."}),"\n",(0,t.jsx)(n.admonition,{title:"AUR",type:"tip",children:(0,t.jsx)(n.p,{children:"On the other hand, if you are familiar with the archLinux, you definitely know\nAUR and what it can do for you. Copr repository is pretty similar, but the\npackages are prebuilt in Copr and Copr repositories can carry the required\ndependencies for said packages, which simplifies the distribution, and can even\nhelp with installing singular packages (when you just need the dependency, not\neverything)."})}),"\n",(0,t.jsx)(n.h2,{id:"my-issue",children:"My issue"}),"\n",(0,t.jsx)(n.p,{children:"Now you might wonder how would I use it on my VPS. It's rather simple, once in\n6 months a new Fedora release comes out. And you need to upgrade to newer\nrelease\u2026 You don't need to do it right away and for such setup it probably isn't\neven recommended."}),"\n",(0,t.jsxs)(n.admonition,{type:"tip",children:[(0,t.jsx)(n.p,{children:"Fedora releases are supported for a year, i.e. they live 6 months till the next\nrelease and then another 6 months till another release."}),(0,t.jsxs)(n.p,{children:["Some people prefer to run one version \u201cbehind\u201d. If you ever decide to run it on\nyour home server or in a similar setup, it might be a pretty good idea to\nfollow. I'm using the \u201clatest greatest\u201d, cause why not ","\ud83d\ude04"]}),(0,t.jsx)(n.p,{children:"One way or another, you still need to bump the release every six months, unless\nyou'd bump 2 releases at once every year, which would be a decision, since, at\nleast I, cannot see any benefits in it\u2026 You don't go for \u201cstability\u201d, cause once\na year you switch to the latest release and then, before you bump, you use one\nyear old software, so you're not even using the latest."})]}),"\n",(0,t.jsx)(n.p,{children:"Fast-forward 2 years in the future, new Fedora release came out (October '22)\nand I was doing an upgrade. Dependencies of the rspamd have been updated and\nrspamd builds in Copr have failed and no one fixed it. Cool, so now I can\nupgrade, but can either ignore the dependencies or uninstall the rspamd\u2026"}),"\n",(0,t.jsx)(n.h2,{id:"how-can-copr-help",children:"How can Copr help?"}),"\n",(0,t.jsxs)(n.p,{children:["I have managed to find\n",(0,t.jsx)(n.a,{href:"https://github.com/rspamd/rspamd/blob/master/rpm/rspamd.spec",children:"specfile"})," for the\nrspamd package that they use for CentOS. There were some files apart from the\nspecfile, so I had to make an SRPM locally and then\u2026 I just uploaded the SRPM\nto the Copr to\n",(0,t.jsx)(n.a,{href:"https://copr.fedorainfracloud.org/coprs/mfocko/rspamd/build/5046567/",children:"build"}),"\nan RPM."]}),"\n",(0,t.jsx)(n.p,{children:"I have switched the previous Copr repository for rspamd with my own and happily\nproceeded with the upgrade."}),"\n",(0,t.jsx)(n.h2,{id:"conclusion",children:"Conclusion"}),"\n",(0,t.jsxs)(n.p,{children:["Copr is heavily used for testing builds on the upstream with\n",(0,t.jsx)(n.a,{href:"https://packit.dev",children:"Packit"}),". However, as you can see, it is possible to use it\n",(0,t.jsx)(n.strong,{children:"very well"})," for packaging your own stuff and avoiding issues (such as the one\nI have described above), if need be."]}),"\n",(0,t.jsxs)(n.section,{"data-footnotes":!0,className:"footnotes",children:[(0,t.jsx)(n.h2,{className:"sr-only",id:"footnote-label",children:"Footnotes"}),"\n",(0,t.jsxs)(n.ol,{children:["\n",(0,t.jsxs)(n.li,{id:"user-content-fn-1-d4045e",children:["\n",(0,t.jsxs)(n.p,{children:[(0,t.jsx)(n.a,{href:"https://vpsfree.cz",children:"vpsFree.cz"})," ",(0,t.jsx)(n.a,{href:"#user-content-fnref-1-d4045e","data-footnote-backref":"","aria-label":"Back to reference 1",className:"data-footnote-backref",children:"\u21a9"})]}),"\n"]}),"\n",(0,t.jsxs)(n.li,{id:"user-content-fn-2-d4045e",children:["\n",(0,t.jsxs)(n.p,{children:["Even though I've been running archLinux on some Raspberry Pi's and also\non one of my \u201chome servers\u201d, before getting the VPS. You could say I like\nto live on the edge\u2026 ",(0,t.jsx)(n.a,{href:"#user-content-fnref-2-d4045e","data-footnote-backref":"","aria-label":"Back to reference 2",className:"data-footnote-backref",children:"\u21a9"})]}),"\n"]}),"\n"]}),"\n"]})]})}function c(e={}){const{wrapper:n}={...(0,r.a)(),...e.components};return n?(0,t.jsx)(n,{...e,children:(0,t.jsx)(h,{...e})}):h(e)}},11151:(e,n,o)=>{o.d(n,{Z:()=>i,a:()=>a});var t=o(67294);const r={},s=t.createContext(r);function a(e){const n=t.useContext(s);return t.useMemo((function(){return"function"==typeof e?e(n):{...n,...e}}),[n,e])}function i(e){let n;return n=e.disableParentContext?"function"==typeof e.components?e.components(r):e.components||r:a(e.components),t.createElement(s.Provider,{value:n},e.children)}}}]); \ No newline at end of file diff --git a/assets/js/b5a32f14.b58aa0f1.js b/assets/js/b5a32f14.b58aa0f1.js new file mode 100644 index 0000000..19554da --- /dev/null +++ b/assets/js/b5a32f14.b58aa0f1.js @@ -0,0 +1 @@ +"use strict";(self.webpackChunkfi=self.webpackChunkfi||[]).push([[2433],{31976:(e,n,o)=>{o.r(n),o.d(n,{assets:()=>d,contentTitle:()=>a,default:()=>c,frontMatter:()=>s,metadata:()=>i,toc:()=>l});var t=o(85893),r=o(11151);const s={title:"How can Copr help with broken dependencies",description:"Copr comes to save you when maintainer doesn't care.",date:new Date("2023-08-02T00:00:00.000Z"),authors:[{key:"mf",title:"a.k.a. your opinionated admin"}],tags:["\ud83c\udfed","red-hat","copr","admin","vps"]},a=void 0,i={permalink:"/blog/2023/08/02/copr",editUrl:"https://github.com/mfocko/blog/tree/main/blog/2023-08-02-copr.md",source:"@site/blog/2023-08-02-copr.md",title:"How can Copr help with broken dependencies",description:"Copr comes to save you when maintainer doesn't care.",date:"2023-08-02T00:00:00.000Z",formattedDate:"August 2, 2023",tags:[{label:"\ud83c\udfed",permalink:"/blog/tags/\ud83c\udfed"},{label:"red-hat",permalink:"/blog/tags/red-hat"},{label:"copr",permalink:"/blog/tags/copr"},{label:"admin",permalink:"/blog/tags/admin"},{label:"vps",permalink:"/blog/tags/vps"}],readingTime:3.44,hasTruncateMarker:!0,authors:[{name:"Matej Focko",email:"me+blog@mfocko.xyz",title:"a.k.a. your opinionated admin",url:"https://gitlab.com/mfocko",imageURL:"https://github.com/mfocko.png",key:"mf"}],frontMatter:{title:"How can Copr help with broken dependencies",description:"Copr comes to save you when maintainer doesn't care.",date:"2023-08-02T00:00:00.000Z",authors:[{key:"mf",title:"a.k.a. your opinionated admin"}],tags:["\ud83c\udfed","red-hat","copr","admin","vps"]},unlisted:!1,prevItem:{title:"Mixed feelings on Rust",permalink:"/blog/2024/01/28/rust-opinion"},nextItem:{title:"4th week of Advent of Code '22 in Rust",permalink:"/blog/aoc-2022/4th-week"}},d={authorsImageUrls:[void 0]},l=[{value:"How does Copr repositories work?",id:"how-does-copr-repositories-work",level:2},{value:"My issue",id:"my-issue",level:2},{value:"How can Copr help?",id:"how-can-copr-help",level:2},{value:"Conclusion",id:"conclusion",level:2}];function h(e){const n={a:"a",admonition:"admonition",code:"code",h2:"h2",li:"li",ol:"ol",p:"p",pre:"pre",section:"section",strong:"strong",sup:"sup",...(0,r.a)(),...e.components};return(0,t.jsxs)(t.Fragment,{children:[(0,t.jsx)(n.p,{children:"When you decide to run Fedora on your VPS, you might get screwed over by using\nrandom repositories\u2026"}),"\n",(0,t.jsxs)(n.p,{children:["When I \u201creserved\u201d my VPS",(0,t.jsx)(n.sup,{children:(0,t.jsx)(n.a,{href:"#user-content-fn-1-d4045e",id:"user-content-fnref-1-d4045e","data-footnote-ref":!0,"aria-describedby":"footnote-label",children:"1"})})," back in June '20, I slapped Fedora on it without\nthinking. I bet 99% of people would say that I'm crazy for doing such thing",(0,t.jsx)(n.sup,{children:(0,t.jsx)(n.a,{href:"#user-content-fn-2-d4045e",id:"user-content-fnref-2-d4045e","data-footnote-ref":!0,"aria-describedby":"footnote-label",children:"2"})}),",\n",(0,t.jsx)(n.strong,{children:"BUT"})," I've been using Fedora on my PCs for some time already and it felt very\nstable and natural to just use, even for VPS."]}),"\n",(0,t.jsxs)(n.p,{children:["One of the first things I've done was setting up a mail server. You may guess\nwhat's the fun part about having a mail server\u2026 Yes, it's all the spam you\nreceive and only then you realize how much \u201ccrap\u201d gets filtered on free mail\nservices. To battle this problem I chose to use\n",(0,t.jsx)(n.a,{href:"https://github.com/rspamd/rspamd",children:"rspamd"})," that had CentOS support, but someone\nhad a ",(0,t.jsx)(n.a,{href:"https://copr.fedorainfracloud.org/",children:"Copr"})," repository that I used to\ninstall it."]}),"\n",(0,t.jsx)(n.h2,{id:"how-does-copr-repositories-work",children:"How does Copr repositories work?"}),"\n",(0,t.jsxs)(n.p,{children:["If you have ever used Ubuntu, you might be familiar with the concept since it is\nvery close to ",(0,t.jsx)(n.a,{href:"https://help.ubuntu.com/community/PPA",children:"PPAs"}),"."]}),"\n",(0,t.jsx)(n.p,{children:"tl;dr of the whole process consists of"}),"\n",(0,t.jsxs)(n.ol,{children:["\n",(0,t.jsx)(n.li,{children:"enabling the Copr repository, and"}),"\n",(0,t.jsx)(n.li,{children:"installing the desired package."}),"\n"]}),"\n",(0,t.jsx)(n.p,{children:"So in shell you would do"}),"\n",(0,t.jsx)(n.pre,{children:(0,t.jsx)(n.code,{children:"# dnf copr enable \u2039copr-repository\u203a\n# dnf install \u2039package-from-the-repository\u203a\n"})}),"\n",(0,t.jsx)(n.p,{children:"And\u2026 that's it! Nothing else needed! Simple, right? And literally same process\nas you would do for the PPA."}),"\n",(0,t.jsx)(n.admonition,{title:"AUR",type:"tip",children:(0,t.jsx)(n.p,{children:"On the other hand, if you are familiar with the archLinux, you definitely know\nAUR and what it can do for you. Copr repository is pretty similar, but the\npackages are prebuilt in Copr and Copr repositories can carry the required\ndependencies for said packages, which simplifies the distribution, and can even\nhelp with installing singular packages (when you just need the dependency, not\neverything)."})}),"\n",(0,t.jsx)(n.h2,{id:"my-issue",children:"My issue"}),"\n",(0,t.jsx)(n.p,{children:"Now you might wonder how would I use it on my VPS. It's rather simple, once in\n6 months a new Fedora release comes out. And you need to upgrade to newer\nrelease\u2026 You don't need to do it right away and for such setup it probably isn't\neven recommended."}),"\n",(0,t.jsxs)(n.admonition,{type:"tip",children:[(0,t.jsx)(n.p,{children:"Fedora releases are supported for a year, i.e. they live 6 months till the next\nrelease and then another 6 months till another release."}),(0,t.jsxs)(n.p,{children:["Some people prefer to run one version \u201cbehind\u201d. If you ever decide to run it on\nyour home server or in a similar setup, it might be a pretty good idea to\nfollow. I'm using the \u201clatest greatest\u201d, cause why not ","\ud83d\ude04"]}),(0,t.jsx)(n.p,{children:"One way or another, you still need to bump the release every six months, unless\nyou'd bump 2 releases at once every year, which would be a decision, since, at\nleast I, cannot see any benefits in it\u2026 You don't go for \u201cstability\u201d, cause once\na year you switch to the latest release and then, before you bump, you use one\nyear old software, so you're not even using the latest."})]}),"\n",(0,t.jsx)(n.p,{children:"Fast-forward 2 years in the future, new Fedora release came out (October '22)\nand I was doing an upgrade. Dependencies of the rspamd have been updated and\nrspamd builds in Copr have failed and no one fixed it. Cool, so now I can\nupgrade, but can either ignore the dependencies or uninstall the rspamd\u2026"}),"\n",(0,t.jsx)(n.h2,{id:"how-can-copr-help",children:"How can Copr help?"}),"\n",(0,t.jsxs)(n.p,{children:["I have managed to find\n",(0,t.jsx)(n.a,{href:"https://github.com/rspamd/rspamd/blob/master/rpm/rspamd.spec",children:"specfile"})," for the\nrspamd package that they use for CentOS. 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Or ",(0,s.jsx)(n.code,{children:"NULL"})," in case\nerror occurs."]}),"\n",(0,s.jsx)(n.p,{children:"Example:"}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-c",children:'char *encrypted = vigenere_encrypt("CoMPuTeR", "Hello world!");\n\nprintf("%s\\n", encrypted);\n// "JSXAI PSINR!"\n\nif (encrypted != NULL) {\n free(encrypted)\n}\n'})}),"\n",(0,s.jsx)(n.h4,{id:"bonus-part-05-k",children:"Bonus part (0.5 K\u20a1)"}),"\n",(0,s.jsx)(n.p,{children:"If you can utilize helper function that would do both encrypting and decrypting,\nyou can gain 0.5 K\u20a1."}),"\n",(0,s.jsxs)(n.p,{children:["Usage of ",(0,s.jsx)(n.code,{children:"true"}),"/",(0,s.jsx)(n.code,{children:"false"})," to decide path in code is prohibited. It leads to merging\nof both functions into one. Point of this part is to discover a way to do this\ngenerically in such way that there are no separate paths for one or the other. One\nfunction with no branching for both of them, parametrization is your friend :)"]}),"\n",(0,s.jsx)(n.h3,{id:"task-no-3-bit-madness-05-k",children:"Task no. 3: Bit madness (0.5 K\u20a1)"}),"\n",(0,s.jsx)(n.p,{children:"This is a state of the art crypto. Please do not share :)"}),"\n",(0,s.jsx)(n.p,{children:"For encrypting:"}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsx)(n.li,{children:"Split the character that is to be encrypted in halves (4 and 4 bits each)."}),"\n",(0,s.jsx)(n.li,{children:"Bits in 1st half are to be split into pairs. Swap bits in those pairs."}),"\n",(0,s.jsxs)(n.li,{children:["Then use the 4 bits that you created in the 2nd step for ",(0,s.jsx)(n.code,{children:"XOR"})," with the other\n4 bits."]}),"\n"]}),"\n",(0,s.jsxs)(n.p,{children:["This simple and ingenious principle will be illustrated on the following example.\nString we want to encrypt is ",(0,s.jsx)(n.code,{children:"Hello world!"}),". We need to encrypt each letter separately,\nso we will demonstrate on letter ",(0,s.jsx)(n.code,{children:"H"}),":"]}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["Letter ",(0,s.jsx)(n.code,{children:"H"})," is represented in ASCII as ",(0,s.jsx)(n.code,{children:"72"}),"."]}),"\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.code,{children:"72"})," represented in binary is: ",(0,s.jsx)(n.code,{children:"01001000"}),". So first 4 bits are: ",(0,s.jsx)(n.code,{children:"0100"})," and last\n4 bits are ",(0,s.jsx)(n.code,{children:"1000"}),"."]}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["First half of bits (",(0,s.jsx)(n.code,{children:"0100"}),") consists of 2 pairs (",(0,s.jsx)(n.code,{children:"01"})," and ",(0,s.jsx)(n.code,{children:"00"}),") which we swap\n(",(0,s.jsx)(n.code,{children:"01 ~> 10"})," and ",(0,s.jsx)(n.code,{children:"00 ~> 00"}),"). That way we get ",(0,s.jsx)(n.code,{children:"1000"}),"."]}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsx)(n.p,{children:"That half is used for xor with the other 4 bits:"}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{children:" 1000 // second half\nXOR 1000 // first half after 2nd step\n--------\n 0000\n"})}),"\n"]}),"\n",(0,s.jsxs)(n.li,{children:["\n",(0,s.jsxs)(n.p,{children:["Now we combine both halves (first one is ",(0,s.jsx)(n.code,{children:"1000"}),", which we got from the 2nd step\nand second one is ",(0,s.jsx)(n.code,{children:"0000"}),", which we got from the 3rd step) and get ",(0,s.jsx)(n.code,{children:"10000000"}),",\nwhich is encrypted character ",(0,s.jsx)(n.code,{children:"H"})," using this method."]}),"\n"]}),"\n"]}),"\n",(0,s.jsx)(n.p,{children:"In case of decryption, reverse those steps."}),"\n",(0,s.jsx)(n.p,{children:"Your task is to implement functions:"}),"\n",(0,s.jsxs)(n.ul,{children:["\n",(0,s.jsx)(n.li,{children:(0,s.jsx)(n.code,{children:"unsigned char* bit_encrypt(const char* text)"})}),"\n",(0,s.jsx)(n.li,{children:(0,s.jsx)(n.code,{children:"char* bit_decrypt(const unsigned char* text)"})}),"\n"]}),"\n",(0,s.jsx)(n.p,{children:"Example:"}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-c",children:'unsigned char* encrypted = bit_encrypt("Hello world!");\n\nfor (int i = 0; i < 12;i++) {\n printf("%x ", encrypted[i]);\n //80 9c 95 95 96 11 bc 96 b9 95 9d 10\n}\n\nif (encrypted != NULL) {\n free(encrypted);\n}\n'})}),"\n",(0,s.jsx)(n.h3,{id:"task-no-4-all-combined-to-bmp-05-k",children:"Task no. 4: All combined to BMP (0.5 K\u20a1)"}),"\n",(0,s.jsx)(n.p,{children:"Authors of the BMP cipher are non-disclosed :)"}),"\n",(0,s.jsx)(n.p,{children:"Create pair of functions:"}),"\n",(0,s.jsxs)(n.ul,{children:["\n",(0,s.jsx)(n.li,{children:(0,s.jsx)(n.code,{children:"unsigned char* bmp_encrypt(const char* key, const char* text)"})}),"\n",(0,s.jsx)(n.li,{children:(0,s.jsx)(n.code,{children:"char* bmp_decrypt(const char* key, const unsigned char* text)"})}),"\n"]}),"\n",(0,s.jsx)(n.p,{children:"BMP cipher consists of following steps for encrypting:"}),"\n",(0,s.jsxs)(n.ol,{children:["\n",(0,s.jsx)(n.li,{children:"Reverse the input string"}),"\n",(0,s.jsx)(n.li,{children:"Use Vigenere on the string you got from step #1"}),"\n",(0,s.jsx)(n.li,{children:"Use bit madness on the string you got from step #2"}),"\n"]}),"\n",(0,s.jsx)(n.p,{children:"For decrypting, reverse the steps."}),"\n",(0,s.jsx)(n.h2,{id:"submitting",children:"Submitting"}),"\n",(0,s.jsx)(n.p,{children:"In case you have any questions, feel free to reach out to me."}),"\n",(0,s.jsx)(n.hr,{})]})}function a(e={}){const{wrapper:n}={...(0,t.a)(),...e.components};return n?(0,s.jsx)(n,{...e,children:(0,s.jsx)(h,{...e})}):h(e)}},11151:(e,n,r)=>{r.d(n,{Z:()=>o,a:()=>c});var s=r(67294);const t={},i=s.createContext(t);function c(e){const n=s.useContext(i);return s.useMemo((function(){return"function"==typeof e?e(n):{...n,...e}}),[n,e])}function o(e){let n;return n=e.disableParentContext?"function"==typeof e.components?e.components(t):e.components||t:c(e.components),s.createElement(i.Provider,{value:n},e.children)}}}]); 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Rust"})})]}),"\n",(0,s.jsx)(n.h3,{id:"consequences",children:"Consequences"}),"\n",(0,s.jsx)(n.p,{children:"Where are we heading with this approach of \u201cif it compiles, it runs\u201d though?\nIn this aspect I have a rather similar opinion as with regards to the ChatGPT\nand its derivatives."}),"\n",(0,s.jsxs)(n.p,{children:["If you teach people to 100% depend on the compiler, they will do it, cause it's\n",(0,s.jsx)(n.em,{children:"easy"}),". All you need to do is make the compiler ",(0,s.jsx)(n.em,{children:"shut up"}),(0,s.jsx)(n.sup,{children:(0,s.jsx)(n.a,{href:"#user-content-fn-3-e21849",id:"user-content-fnref-3-e21849","data-footnote-ref":!0,"aria-describedby":"footnote-label",children:"2"})}),". Giving up the\n",(0,s.jsx)(n.em,{children:"intellectual masturbation"})," about the memory safety will make you lose your edge\nover the time. When we get to the point of everyone being in the mindset\nmentioned above, who's going to maintain the compiler? This is the place where\nyou ",(0,s.jsx)(n.strong,{children:"need to"})," think about the memory safety and furthermore in a much more\ngeneral way than in your own projects, because it is the thing that everyone\n",(0,s.jsx)(n.em,{children:"blindly believes in"})," in the end."]}),"\n",(0,s.jsxs)(n.p,{children:["I'm not saying that everyone should give up Rust and think about their memory\nmanagement and potential memory issues. I'm just saying that going the easy way\nwill make people ",(0,s.jsx)(n.em,{children:"dull"})," and they should think about it anyways, that's how the\nissue above has been discovered. If everyone walked past and didn't think about\nit, no one would discover this issue till it bit them hard."]}),"\n",(0,s.jsxs)(n.admonition,{title:"Standard library",type:"tip",children:[(0,s.jsxs)(n.p,{children:["Even the standard library is littered with ",(0,s.jsx)(n.code,{children:"unsafe"})," blocks that are prefixed\nwith comments in style:"]}),(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-rs",children:"// SAFETY: \u2026\n"})}),(0,s.jsxs)(n.p,{children:["The fact that the ",(0,s.jsx)(n.em,{children:"casual"})," Rust dev doesn't have to think much about safety,\ncause the compiler has their back, doesn't mean that the Rust compiler dev\ndoesn't either."]}),(0,s.jsxs)(n.p,{children:["I gotta admit that I adopted this concept in other languages (even in Python),\ncause you can encounter situations where it doesn't have to be clear ",(0,s.jsx)(n.em,{children:"why"})," you\ncan do ",(0,s.jsx)(n.em,{children:"what"})," you're doing."]})]}),"\n",(0,s.jsx)(n.h2,{id:"development--design",children:"Development & design"}),"\n",(0,s.jsx)(n.p,{children:"Development of Rust is\u2026 very fast. One positive is that they're trying to be as\nbackward compatible as possible at least by verifying against all the published\ncrates in the process. Of course, you cannot be backward compatible about fixing\nthe bugs that have been found, but such is life."}),"\n",(0,s.jsx)(n.h3,{id:"fast-development-cycle",children:"Fast development cycle"}),"\n",(0,s.jsx)(n.p,{children:"One of the negatives of the fast development cycle is the fact that they're\nusing the latest features already in the next release of the Rust. Yes, it is\nsomething that you can use for verifying and testing your own changes, but at\nthe same time it places a requirement of the latest release to compile the next\none."}),"\n",(0,s.jsx)(n.admonition,{type:"tip",children:(0,s.jsxs)(n.p,{children:["If you check ",(0,s.jsx)(n.code,{children:"gcc"})," for example, they have a requirement of minimal version of\ncompiler that you need for the build. Though gcc's requirement is not so ",(0,s.jsx)(n.em,{children:"needy"}),"\nas the Rust one."]})}),"\n",(0,s.jsx)(n.p,{children:"One of the other negatives is the introduction of bugs. If you're pushing\nchanges, somewhat mindlessly, at such a fast pace, it is inevitable to introduce\na bunch bugs in the process. Checking the GitHub issue tracker with"}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{children:"is:issue is:open label:C-bug label:T-compiler\n"})}),"\n",(0,s.jsxs)(n.p,{children:["yields ",(0,s.jsx)(n.strong,{children:"2,224"})," open issues at the time of writing this post."]}),"\n",(0,s.jsx)(n.h3,{id:"rfcs",children:"RFCs"}),"\n",(0,s.jsxs)(n.p,{children:["You can find ",(0,s.jsx)(n.strong,{children:"a lot"})," of RFCs for the Rust. Some of them are more questionable\nthan the others. Fun thing is that a lot of them make it to the nightly builds,\nso they can be tested and polished off. Even the questionable ones\u2026 I'll leave\nfew examples for a better understanding."]}),"\n",(0,s.jsxs)(n.p,{children:["One of such features is the ",(0,s.jsx)(n.code,{children:"do yeet"})," expression:"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-rust",children:"#![feature(yeet_expr)]\n\nfn foo() -> Result<String, i32> {\n do yeet 4;\n}\nassert_eq!(foo(), Err(4));\n\nfn bar() -> Option<String> {\n do yeet;\n}\nassert_eq!(bar(), None);\n"})}),"\n",(0,s.jsxs)(n.p,{children:["It allows you to \u201cyeet\u201d the errors out of the functions that return ",(0,s.jsx)(n.code,{children:"Result"})," or\n",(0,s.jsx)(n.code,{children:"Option"}),"."]}),"\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.a,{href:"https://github.com/rust-lang/rfcs/pull/3503",children:"One"})," of the more recent ones is\nthe ability to include Cargo manifests into the sources, so you can do something\nlike:"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-rust",children:'#!/usr/bin/env cargo\n---\n[dependencies]\nclap = { version = "4.2", features = ["derive"] }\n---\n\nuse clap::Parser;\n\n#[derive(Parser, Debug)]\n#[clap(version)]\nstruct Args {\n #[clap(short, long, help = "Path to config")]\n config: Option<std::path::PathBuf>,\n}\n\nfn main() {\n let args = Args::parse();\n println!("{:?}", args);\n}\n'})}),"\n",(0,s.jsx)(n.p,{children:"I would say you can get almost anything into the language\u2026"}),"\n",(0,s.jsx)(n.h2,{id:"community-and-hype-train",children:"Community and hype train"}),"\n",(0,s.jsxs)(n.p,{children:["Rust community is a rather unique thing. A lot of people will hate me for this,\nbut I can't help, but to compare them to ",(0,s.jsx)(n.em,{children:"militant vegans"}),". I'll go through some\nof the things related to it, so I can support my opinion at least."]}),"\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.em,{children:"Rust is the best language."})," It is not. There is no best language, each has its\nown positives and negatives, you need to choose the language that's ",(0,s.jsx)(n.strong,{children:"the most"}),"\n",(0,s.jsx)(n.strong,{children:"suitable for your use case"}),". There are areas where Rust excels, though I have\nto admit it's very close to being a universal hammer regardless of how suitable\nit is. There is a very steep learning curve to it, beginnings in Rust are very\npainful."]}),"\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.em,{children:"Rewrite everything in Rust."})," Just no. There are multiple feedbacks on doing\nrewrites, it is very common to fix ",(0,s.jsx)(n.em,{children:"N"})," bugs with a rewrite while introducing\n",(0,s.jsx)(n.em,{children:"N + 1"})," other bugs in the process. It doesn't solve anything unless there are\nsome strong reasons to go with it. Majority of such suggested rewrites don't\nhave those reasons though."]}),"\n",(0,s.jsxs)(n.p,{children:[(0,s.jsx)(n.em,{children:"Language \u2039x\u203a is bad, though in Rust\u2026"})," Cherry-picking one specific pain point of\none language and reflecting how it is better in other language can go both ways.\nFor example it is rather easy to pick the limitations imposed by Rust compiler\nand show how it's possible in other languages ","\ud83e\udd37\u200d\u2642\ufe0f"]}),"\n",(0,s.jsx)(n.p,{children:"I don't mind any of those opinions, you're free to have them, as long as you\ndon't rub them in my face which is not the usual case\u2026 This experience makes it\njust worse for me, part of this post may be also influenced by this fact."}),"\n",(0,s.jsx)(n.h3,{id:"rust-in-linux",children:"Rust in Linux"}),"\n",(0,s.jsx)(n.admonition,{type:"caution",children:(0,s.jsx)(n.p,{children:"As someone who has seen the way Linux kernel is built in the RHEL ecosystem, how\ncomplex the whole thing is and how much resources you need to proceed, I have\nvery strong opinions on this topic."})}),"\n",(0,s.jsx)(n.p,{children:"It took years of work to even \u201cincorporate\u201d Rust into the Linux codebase, just\nto get the \u201cHello World!\u201d. I don't have anything against the idea of writing\ndrivers in the Rust, I bet it can catch a lot of common mistakes, but still\nintroducing Rust to the kernel is another step to enlarge the monster."}),"\n",(0,s.jsxs)(n.p,{children:["I have to admit though that the ",(0,s.jsx)(n.em,{children:"Apple GPU"})," driver for Linux written in Rust is\nquite impressive. Apart from that there are not so many benefits, yet\u2026"]}),"\n",(0,s.jsx)(n.h2,{id:"packaging",children:"Packaging"}),"\n",(0,s.jsx)(n.p,{children:"I'll divide the packaging into the packaging of the language itself and the\nprograms written in Rust."}),"\n",(0,s.jsxs)(n.p,{children:["Let's start with the ",(0,s.jsx)(n.code,{children:"cargo"})," itself though. Package managers of the languages\nusually get a lot of hate (you can take ",(0,s.jsx)(n.code,{children:"npm"})," or ",(0,s.jsx)(n.code,{children:"pip"})," as examples",(0,s.jsx)(n.sup,{children:(0,s.jsx)(n.a,{href:"#user-content-fn-1-e21849",id:"user-content-fnref-1-e21849","data-footnote-ref":!0,"aria-describedby":"footnote-label",children:"3"})}),"). If\nyou've ever tried out Rust, I bet you already know where I'm going with this.\nYes, I mean the compilation times, or even Cargo downloading ",(0,s.jsx)(n.em,{children:"whole"})," index of\ncrates just so you can update that one dependency (and 3 millions of indirect\ndeps). When I was doing AoC \u201822 in Rust, I've set up ",(0,s.jsx)(n.code,{children:"sccache"})," right away on the\nfirst day."]}),"\n",(0,s.jsxs)(n.p,{children:["Let's move to the packaging of the Rust itself, it's tedious. Rust has a very\nfast development cycle and doesn't even try to make the builds backward\ncompatible. If there is a new release of Rust, there is a very high chance that\nyou cannot build that release with anything other than ",(0,s.jsx)(n.strong,{children:"the latest"})," Rust\nrelease. If you have ever touched the packaging, you know that this is something\nthat can cause a lot of problems, cause you need the second-to-latest version to\ncompile the latest version, don't forget that this applies inductively\u2026 People\nrunning ",(0,s.jsx)(n.em,{children:"Gentoo"})," could tell you a lot about this."]}),"\n",(0,s.jsx)(n.admonition,{type:"info",children:(0,s.jsx)(n.p,{children:"Compiling the compilers takes usually more time than compiling the kernel\nitself\u2026"})}),"\n",(0,s.jsxs)(n.p,{children:["I cannot speak about packaging of Rust programs in other than RHEL-based\ndistros, though I can speak about RHEL ecosystem. Fedora packaging guidelines\nspecify that you need to build each and every dependency of the program\nseparately. I wanted to try out ",(0,s.jsx)(n.em,{children:"AlmaLinux"})," and install Alacritty there and I\nfailed miserably. The solution that worked, consisted of ignoring the packaging\nguidelines, running ",(0,s.jsx)(n.code,{children:"cargo build"})," and consuming the binaries afterwards.\nDependencies of the Rust programs are of a similar nature as JS dependencies."]}),"\n",(0,s.jsxs)(n.blockquote,{children:["\n",(0,s.jsxs)(n.p,{children:["I'm tipping my fedora",(0,s.jsx)(n.sup,{children:(0,s.jsx)(n.a,{href:"#user-content-fn-2-e21849",id:"user-content-fnref-2-e21849-2","data-footnote-ref":!0,"aria-describedby":"footnote-label",children:"1"})})," in the general direction of the maintainers of Rust\npackages in RHEL ecosystem. I wouldn't be able to do this without losing my\nsanity."]}),"\n"]}),"\n",(0,s.jsx)(n.h2,{id:"likes",children:"Likes"}),"\n",(0,s.jsxs)(n.p,{children:["If you've come all the way here and you're a Rustacean, I believe I've managed\nto get your blood boiling, so it's time to finish this off by stuff I like about\nRust. I doubt I will be able to cover everything, but I can try at least. You\nhave to admit it's much easier to remember the bad stuff as opposed to the good.\n","\ud83d\ude09"]}),"\n",(0,s.jsx)(n.h3,{id:"workflow-and-toolchain",children:"Workflow and toolchain"}),"\n",(0,s.jsxs)(n.p,{children:["I prefered using Rust for the ",(0,s.jsx)(n.em,{children:"Advent of Code"})," and ",(0,s.jsx)(n.em,{children:"Codeforces"})," as it provides\na rather easy way to test the solutions before running them with the challenge\ninput (or test runner). I can give an example from the ",(0,s.jsx)(n.em,{children:"Advent of Code"}),":"]}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-rust",children:"use aoc_2023::*;\n\ntype Output1 = i32;\ntype Output2 = Output1;\n\nstruct DayXX {}\nimpl Solution<Output1, Output2> for DayXX {\n fn new<P: AsRef<Path>>(pathname: P) -> Self {\n let lines: Vec<String> = file_to_lines(pathname);\n\n todo!()\n }\n\n fn part_1(&mut self) -> Output1 {\n todo!()\n }\n\n fn part_2(&mut self) -> Output2 {\n todo!()\n }\n}\n\nfn main() -> Result<()> {\n DayXX::main()\n}\n\ntest_sample!(day_XX, DayXX, 42, 69);\n"})}),"\n",(0,s.jsx)(n.p,{children:"This was the skeleton I've used and the macro at the end is my own creation that\nexpands to:"}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-rust",children:"#[cfg(test)]\nmod day_XX {\n use super::*;\n\n #[test]\n fn part_1() {\n let path = DayXX::get_sample(1);\n let mut day = DayXX::new(path);\n assert_eq!(day.part_1(), 42);\n }\n\n #[test]\n fn part_2() {\n let path = DayXX::get_sample(2);\n let mut day = DayXX::new(path);\n assert_eq!(day.part_2(), 69);\n }\n}\n"})}),"\n",(0,s.jsxs)(n.p,{children:["When you're solving the problem, all you need to do is switch between\n",(0,s.jsx)(n.code,{children:"cargo test"})," and ",(0,s.jsx)(n.code,{children:"cargo run"})," to check the answer to either sample or the\nchallenge input itself."]}),"\n",(0,s.jsxs)(n.p,{children:["Introduce ",(0,s.jsx)(n.a,{href:"https://dystroy.org/bacon/",children:"bacon"})," and it gets even better. Bacon is a CLI tool that wraps around\nthe ",(0,s.jsx)(n.code,{children:"cargo"})," and allows you to check, run, lint or run tests on each file save.\nIt's a very pleasant thing for a so-called ",(0,s.jsx)(n.em,{children:"compiler-assisted"})," development."]}),"\n",(0,s.jsxs)(n.p,{children:["Speaking of linting from within the bacon, you cannot leave out the ",(0,s.jsx)(n.a,{href:"https://github.com/rust-lang/rust-clippy",children:"clippy"}),".\nNot only it can whip your ass because of errors, but it can also produce a lot\nof helpful suggestions, for example passing slices by borrow instead of\nborrowing the ",(0,s.jsx)(n.code,{children:"Vec"})," itself when you don't need it."]}),"\n",(0,s.jsx)(n.h3,{id:"standard-library",children:"Standard library"}),"\n",(0,s.jsxs)(n.p,{children:["There's ",(0,s.jsx)(n.strong,{children:"a lot"})," included in the standard library. It almost feels like you\nhave all you need",(0,s.jsx)(n.sup,{children:(0,s.jsx)(n.a,{href:"#user-content-fn-4-e21849",id:"user-content-fnref-4-e21849","data-footnote-ref":!0,"aria-describedby":"footnote-label",children:"4"})}),". I like placeholders (like ",(0,s.jsx)(n.code,{children:"todo!()"}),", ",(0,s.jsx)(n.code,{children:"unreachable!()"}),",\n",(0,s.jsx)(n.code,{children:"unimplemented!()"}),") to the extent of\n",(0,s.jsx)(n.a,{href:"/cpp/exceptions-and-raii/placeholders",children:"implementing"})," them as exceptions in C++."]}),"\n",(0,s.jsx)(n.p,{children:"You can find almost anything. Though you can also hit some very weird issues\nwith some of the nuances of the type system."}),"\n",(0,s.jsx)(n.h3,{id:"unsafe",children:(0,s.jsx)(n.code,{children:"unsafe"})}),"\n",(0,s.jsxs)(n.p,{children:["This might be something that people like to avoid as much as possible. However I\nthink that forming a habit of commenting posibly unsafe operations in ",(0,s.jsx)(n.strong,{children:"any"}),"\nlanguage is a good habit, as I've mentioned above. You should be able to argue\nwhy you can do something safely, even if the compiler is not kicking your ass\nbecause of it."]}),"\n",(0,s.jsx)(n.p,{children:"Excerpt of such comment from work:"}),"\n",(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-py",children:"# SAFETY: Taking first package instead of specific package should be\n# safe, since we have put a requirement on \xbbone\xab \u2039upstream_project_url\u203a\n# per Packit config, i.e. even if we're dealing with a monorepo, there\n# is only \xbbone\xab upstream. If there is one upstream, there is only one\n# set of GPG keys that can be allowed.\nreturn self.downstream_config.packages[\n self.downstream_config._first_package\n].allowed_gpg_keys\n"})}),"\n",(0,s.jsx)(n.h3,{id:"traits",children:"Traits"}),"\n",(0,s.jsxs)(n.p,{children:["One of the other things I like are the traits. They are more restrictive than\ntemplates or concepts in C++, but they're doing their job pretty good. If you\nare building library and require multiple traits to be satisfied it means a lot\nof copy-paste, but that's soon to be fixed by the ",(0,s.jsx)(n.a,{href:"https://github.com/rust-lang/rfcs/blob/master/text/1733-trait-alias.md",children:"trait aliases"}),"."]}),"\n",(0,s.jsxs)(n.admonition,{title:"Comparing to other languages",type:"tip",children:[(0,s.jsxs)(n.p,{children:["On Wikipedia I've seen trait being defined as a more restrictive type class as\nyou may know it from the Haskell for example. C++ isn't behind either with its\n",(0,s.jsx)(n.em,{children:"constraints and concepts"}),". I would say that we can order them in the following\norder based on the complexity they can express:"]}),(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{children:"Rust's trait < Haskell's type class < C++'s concept\n"})})]}),"\n",(0,s.jsxs)(n.p,{children:["You can also hit some issues, like me when trying to support conversions between\nunderlying numeric types of a 2D vectors or support for using an operator from\nboth sides (I couldn't get ",(0,s.jsx)(n.code,{children:"c * u"})," to work in the same way as ",(0,s.jsx)(n.code,{children:"u * c"})," because\nthe first one requires you to implement the trait of a built-in type)."]}),"\n",(0,s.jsxs)(n.admonition,{title:"Implementation",type:"warning",children:[(0,s.jsx)(n.p,{children:"Implementing traits lies in"}),(0,s.jsx)(n.pre,{children:(0,s.jsx)(n.code,{className:"language-rust",children:"impl SomeTrait for SomeStruct {\n // implementation goes here\n}\n"})}),(0,s.jsxs)(n.p,{children:["One of the things I ",(0,s.jsx)(n.strong,{children:"would love to"})," see is being able to define the helper\nfunctions within the same block. As of now, the only things allowed are the ones\nthat are required by the trait, which in the end results in a randomly lying\nfunctions around (or in a implementation of the structure itself). I don't like\nthis mess at all\u2026"]})]}),"\n",(0,s.jsx)(n.h3,{id:"influence-of-functional-paradigm",children:"Influence of functional paradigm"}),"\n",(0,s.jsxs)(n.p,{children:["You can see a big influence of the functional paradigm. Not only in iterators,\nbut also in the other parts of the language. For example I prefer ",(0,s.jsx)(n.code,{children:"Option<T>"})," or\n",(0,s.jsx)(n.code,{children:"Result<T, E>"})," to ",(0,s.jsx)(n.code,{children:"null"}),"s and exceptions. Pattern matching together with\ncompiler both enforces handling of the errors and rather user-friendly way of\ndoing it."]}),"\n",(0,s.jsxs)(n.p,{children:["Not to mention ",(0,s.jsx)(n.code,{children:".and_then()"})," and such. However spending most of the time with\nthe AoC you get pretty annoyed of the repetitive ",(0,s.jsx)(n.code,{children:".unwrap()"})," during parsing,\nsince you are guaranteed correct input."]}),"\n",(0,s.jsx)(n.h3,{id:"macros",children:"Macros"}),"\n",(0,s.jsx)(n.p,{children:"Macros are a very strong pro of the Rust. And no, we're not going to talk about\nthe procedural macros\u2026"}),"\n",(0,s.jsx)(n.p,{children:"As I've shown above I've managed to \u201ctame\u201d a lot of copy-paste in the tests for\nthe AoC by utilizing a macro that generated a very basic template for the tests."}),"\n",(0,s.jsxs)(n.p,{children:["As I have mentioned the traits above, I cannot forget to give props to ",(0,s.jsx)(n.code,{children:"derive"}),"\nmacro that allows you to \u201cdeduce\u201d the default implementation. It is very helpful\nfor a tedious tasks like implementing ",(0,s.jsx)(n.code,{children:"Debug"})," (for printing out the structures)\nor comparisons, though with the comparisons you need to be careful about the\ndefault implementation, it has already bitten me once or twice."]}),"\n",(0,s.jsx)(n.h2,{id:"summary",children:"Summary"}),"\n",(0,s.jsxs)(n.p,{children:["Overall there are many things about the Rust I like and would love to see them\nimplemented in other languages. 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t=e.stateNode;t.pendingContext?Ra(0,t.pendingContext,t.pendingContext!==t.context):t.context&&Ra(0,t.context,!1),ai(e,t.containerInfo)}function Ls(e,t,n,r,a){return go(),ho(a),t.flags|=256,ks(e,t,n,r),t.child}var Ps,Is,Rs,Os,Fs={dehydrated:null,treeContext:null,retryLane:0};function Ms(e){return{baseLanes:e,cachePool:null,transitions:null}}function Ds(e,t,n){var r,a=t.pendingProps,i=li.current,s=!1,l=0!=(128&t.flags);if((r=l)||(r=(null===e||null!==e.memoizedState)&&0!=(2&i)),r?(s=!0,t.flags&=-129):null!==e&&null===e.memoizedState||(i|=1),Ca(li,1&i),null===e)return 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e.languages.tsx["literal-property"],e.languages.tsx.tag)).pattern=RegExp(/(^|[^\w$]|(?=<\/))/.source+"(?:"+t.pattern.source+")",t.pattern.flags),t.lookbehind=!0}(C),C.languages.swift={comment:{pattern:/(^|[^\\:])(?:\/\/.*|\/\*(?:[^/*]|\/(?!\*)|\*(?!\/)|\/\*(?:[^*]|\*(?!\/))*\*\/)*\*\/)/,lookbehind:!0,greedy:!0},"string-literal":[{pattern:RegExp(/(^|[^"#])/.source+"(?:"+/"(?:\\(?:\((?:[^()]|\([^()]*\))*\)|\r\n|[^(])|[^\\\r\n"])*"/.source+"|"+/"""(?:\\(?:\((?:[^()]|\([^()]*\))*\)|[^(])|[^\\"]|"(?!""))*"""/.source+")"+/(?!["#])/.source),lookbehind:!0,greedy:!0,inside:{interpolation:{pattern:/(\\\()(?:[^()]|\([^()]*\))*(?=\))/,lookbehind:!0,inside:null},"interpolation-punctuation":{pattern:/^\)|\\\($/,alias:"punctuation"},punctuation:/\\(?=[\r\n])/,string:/[\s\S]+/}},{pattern:RegExp(/(^|[^"#])(#+)/.source+"(?:"+/"(?:\\(?:#+\((?:[^()]|\([^()]*\))*\)|\r\n|[^#])|[^\\\r\n])*?"/.source+"|"+/"""(?:\\(?:#+\((?:[^()]|\([^()]*\))*\)|[^#])|[^\\])*?"""/.source+")\\2"),lookbehind:!0,greedy:!0,inside:{interpolation:{pattern:/(\\#+\()(?:[^()]|\([^()]*\))*(?=\))/,lookbehind:!0,inside:null},"interpolation-punctuation":{pattern:/^\)|\\#+\($/,alias:"punctuation"},string:/[\s\S]+/}}],directive:{pattern:RegExp(/#/.source+"(?:"+/(?:elseif|if)\b/.source+"(?:[ 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e.languages.kotlin["class-name"];var t={"interpolation-punctuation":{pattern:/^\$\{?|\}$/,alias:"punctuation"},expression:{pattern:/[\s\S]+/,inside:e.languages.kotlin}};e.languages.insertBefore("kotlin","string",{"string-literal":[{pattern:/"""(?:[^$]|\$(?:(?!\{)|\{[^{}]*\}))*?"""/,alias:"multiline",inside:{interpolation:{pattern:/\$(?:[a-z_]\w*|\{[^{}]*\})/i,inside:t},string:/[\s\S]+/}},{pattern:/"(?:[^"\\\r\n$]|\\.|\$(?:(?!\{)|\{[^{}]*\}))*"/,alias:"singleline",inside:{interpolation:{pattern:/((?:^|[^\\])(?:\\{2})*)\$(?:[a-z_]\w*|\{[^{}]*\})/i,lookbehind:!0,inside:t},string:/[\s\S]+/}}],char:{pattern:/'(?:[^'\\\r\n]|\\(?:.|u[a-fA-F0-9]{0,4}))'/,greedy:!0}}),delete e.languages.kotlin.string,e.languages.insertBefore("kotlin","keyword",{annotation:{pattern:/\B@(?:\w+:)?(?:[A-Z]\w*|\[[^\]]+\])/,alias:"builtin"}}),e.languages.insertBefore("kotlin","function",{label:{pattern:/\b\w+@|@\w+\b/,alias:"symbol"}}),e.languages.kt=e.languages.kotlin,e.languages.kts=e.languages.kotlin}(C),C.languages.c=C.languages.extend("clike",{comment:{pattern:/\/\/(?:[^\r\n\\]|\\(?:\r\n?|\n|(?![\r\n])))*|\/\*[\s\S]*?(?:\*\/|$)/,greedy:!0},string:{pattern:/"(?:\\(?:\r\n|[\s\S])|[^"\\\r\n])*"/,greedy:!0},"class-name":{pattern:/(\b(?:enum|struct)\s+(?:__attribute__\s*\(\([\s\S]*?\)\)\s*)?)\w+|\b[a-z]\w*_t\b/,lookbehind:!0},keyword:/\b(?:_Alignas|_Alignof|_Atomic|_Bool|_Complex|_Generic|_Imaginary|_Noreturn|_Static_assert|_Thread_local|__attribute__|asm|auto|break|case|char|const|continue|default|do|double|else|enum|extern|float|for|goto|if|inline|int|long|register|return|short|signed|sizeof|static|struct|switch|typedef|typeof|union|unsigned|void|volatile|while)\b/,function:/\b[a-z_]\w*(?=\s*\()/i,number:/(?:\b0x(?:[\da-f]+(?:\.[\da-f]*)?|\.[\da-f]+)(?:p[+-]?\d+)?|(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:e[+-]?\d+)?)[ful]{0,4}/i,operator:/>>=?|<<=?|->|([-+&|:])\1|[?:~]|[-+*/%&|^!=<>]=?/}),C.languages.insertBefore("c","string",{char:{pattern:/'(?:\\(?:\r\n|[\s\S])|[^'\\\r\n]){0,32}'/,greedy:!0}}),C.languages.insertBefore("c","string",{macro:{pattern:/(^[\t 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C.languages.c.boolean,C.languages.objectivec=C.languages.extend("c",{string:{pattern:/@?"(?:\\(?:\r\n|[\s\S])|[^"\\\r\n])*"/,greedy:!0},keyword:/\b(?:asm|auto|break|case|char|const|continue|default|do|double|else|enum|extern|float|for|goto|if|in|inline|int|long|register|return|self|short|signed|sizeof|static|struct|super|switch|typedef|typeof|union|unsigned|void|volatile|while)\b|(?:@interface|@end|@implementation|@protocol|@class|@public|@protected|@private|@property|@try|@catch|@finally|@throw|@synthesize|@dynamic|@selector)\b/,operator:/-[->]?|\+\+?|!=?|<<?=?|>>?=?|==?|&&?|\|\|?|[~^%?*\/@]/}),delete C.languages.objectivec["class-name"],C.languages.objc=C.languages.objectivec,C.languages.reason=C.languages.extend("clike",{string:{pattern:/"(?:\\(?:\r\n|[\s\S])|[^\\\r\n"])*"/,greedy:!0},"class-name":/\b[A-Z]\w*/,keyword:/\b(?:and|as|assert|begin|class|constraint|do|done|downto|else|end|exception|external|for|fun|function|functor|if|in|include|inherit|initializer|lazy|let|method|module|mutable|new|nonrec|object|of|open|or|private|rec|sig|struct|switch|then|to|try|type|val|virtual|when|while|with)\b/,operator:/\.{3}|:[:=]|\|>|->|=(?:==?|>)?|<=?|>=?|[|^?'#!~`]|[+\-*\/]\.?|\b(?:asr|land|lor|lsl|lsr|lxor|mod)\b/}),C.languages.insertBefore("reason","class-name",{char:{pattern:/'(?:\\x[\da-f]{2}|\\o[0-3][0-7][0-7]|\\\d{3}|\\.|[^'\\\r\n])'/,greedy:!0},constructor:/\b[A-Z]\w*\b(?!\s*\.)/,label:{pattern:/\b[a-z]\w*(?=::)/,alias:"symbol"}}),delete C.languages.reason.function,function(e){for(var t=/\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|<self>)*\*\//.source,n=0;n<2;n++)t=t.replace(/<self>/g,(function(){return t}));t=t.replace(/<self>/g,(function(){return/[^\s\S]/.source})),e.languages.rust={comment:[{pattern:RegExp(/(^|[^\\])/.source+t),lookbehind:!0,greedy:!0},{pattern:/(^|[^\\:])\/\/.*/,lookbehind:!0,greedy:!0}],string:{pattern:/b?"(?:\\[\s\S]|[^\\"])*"|b?r(#*)"(?:[^"]|"(?!\1))*"\1/,greedy:!0},char:{pattern:/b?'(?:\\(?:x[0-7][\da-fA-F]|u\{(?:[\da-fA-F]_*){1,6}\}|.)|[^\\\r\n\t'])'/,greedy:!0},attribute:{pattern:/#!?\[(?:[^\[\]"]|"(?:\\[\s\S]|[^\\"])*")*\]/,greedy:!0,alias:"attr-name",inside:{string:null}},"closure-params":{pattern:/([=(,:]\s*|\bmove\s*)\|[^|]*\||\|[^|]*\|(?=\s*(?:\{|->))/,lookbehind:!0,greedy:!0,inside:{"closure-punctuation":{pattern:/^\||\|$/,alias:"punctuation"},rest:null}},"lifetime-annotation":{pattern:/'\w+/,alias:"symbol"},"fragment-specifier":{pattern:/(\$\w+:)[a-z]+/,lookbehind:!0,alias:"punctuation"},variable:/\$\w+/,"function-definition":{pattern:/(\bfn\s+)\w+/,lookbehind:!0,alias:"function"},"type-definition":{pattern:/(\b(?:enum|struct|trait|type|union)\s+)\w+/,lookbehind:!0,alias:"class-name"},"module-declaration":[{pattern:/(\b(?:crate|mod)\s+)[a-z][a-z_\d]*/,lookbehind:!0,alias:"namespace"},{pattern:/(\b(?:crate|self|super)\s*)::\s*[a-z][a-z_\d]*\b(?:\s*::(?:\s*[a-z][a-z_\d]*\s*::)*)?/,lookbehind:!0,alias:"namespace",inside:{punctuation:/::/}}],keyword:[/\b(?:Self|abstract|as|async|await|become|box|break|const|continue|crate|do|dyn|else|enum|extern|final|fn|for|if|impl|in|let|loop|macro|match|mod|move|mut|override|priv|pub|ref|return|self|static|struct|super|trait|try|type|typeof|union|unsafe|unsized|use|virtual|where|while|yield)\b/,/\b(?:bool|char|f(?:32|64)|[ui](?:8|16|32|64|128|size)|str)\b/],function:/\b[a-z_]\w*(?=\s*(?:::\s*<|\())/,macro:{pattern:/\b\w+!/,alias:"property"},constant:/\b[A-Z_][A-Z_\d]+\b/,"class-name":/\b[A-Z]\w*\b/,namespace:{pattern:/(?:\b[a-z][a-z_\d]*\s*::\s*)*\b[a-z][a-z_\d]*\s*::(?!\s*<)/,inside:{punctuation:/::/}},number:/\b(?:0x[\dA-Fa-f](?:_?[\dA-Fa-f])*|0o[0-7](?:_?[0-7])*|0b[01](?:_?[01])*|(?:(?:\d(?:_?\d)*)?\.)?\d(?:_?\d)*(?:[Ee][+-]?\d+)?)(?:_?(?:f32|f64|[iu](?:8|16|32|64|size)?))?\b/,boolean:/\b(?:false|true)\b/,punctuation:/->|\.\.=|\.{1,3}|::|[{}[\];(),:]/,operator:/[-+*\/%!^]=?|=[=>]?|&[&=]?|\|[|=]?|<<?=?|>>?=?|[@?]/},e.languages.rust["closure-params"].inside.rest=e.languages.rust,e.languages.rust.attribute.inside.string=e.languages.rust.string}(C),C.languages.go=C.languages.extend("clike",{string:{pattern:/(^|[^\\])"(?:\\.|[^"\\\r\n])*"|`[^`]*`/,lookbehind:!0,greedy:!0},keyword:/\b(?:break|case|chan|const|continue|default|defer|else|fallthrough|for|func|go(?:to)?|if|import|interface|map|package|range|return|select|struct|switch|type|var)\b/,boolean:/\b(?:_|false|iota|nil|true)\b/,number:[/\b0(?:b[01_]+|o[0-7_]+)i?\b/i,/\b0x(?:[a-f\d_]+(?:\.[a-f\d_]*)?|\.[a-f\d_]+)(?:p[+-]?\d+(?:_\d+)*)?i?(?!\w)/i,/(?:\b\d[\d_]*(?:\.[\d_]*)?|\B\.\d[\d_]*)(?:e[+-]?[\d_]+)?i?(?!\w)/i],operator:/[*\/%^!=]=?|\+[=+]?|-[=-]?|\|[=|]?|&(?:=|&|\^=?)?|>(?:>=?|=)?|<(?:<=?|=|-)?|:=|\.\.\./,builtin:/\b(?:append|bool|byte|cap|close|complex|complex(?:64|128)|copy|delete|error|float(?:32|64)|u?int(?:8|16|32|64)?|imag|len|make|new|panic|print(?:ln)?|real|recover|rune|string|uintptr)\b/}),C.languages.insertBefore("go","string",{char:{pattern:/'(?:\\.|[^'\\\r\n]){0,10}'/,greedy:!0}}),delete C.languages.go["class-name"],function(e){var t=/\b(?:alignas|alignof|asm|auto|bool|break|case|catch|char|char16_t|char32_t|char8_t|class|co_await|co_return|co_yield|compl|concept|const|const_cast|consteval|constexpr|constinit|continue|decltype|default|delete|do|double|dynamic_cast|else|enum|explicit|export|extern|final|float|for|friend|goto|if|import|inline|int|int16_t|int32_t|int64_t|int8_t|long|module|mutable|namespace|new|noexcept|nullptr|operator|override|private|protected|public|register|reinterpret_cast|requires|return|short|signed|sizeof|static|static_assert|static_cast|struct|switch|template|this|thread_local|throw|try|typedef|typeid|typename|uint16_t|uint32_t|uint64_t|uint8_t|union|unsigned|using|virtual|void|volatile|wchar_t|while)\b/,n=/\b(?!<keyword>)\w+(?:\s*\.\s*\w+)*\b/.source.replace(/<keyword>/g,(function(){return t.source}));e.languages.cpp=e.languages.extend("c",{"class-name":[{pattern:RegExp(/(\b(?:class|concept|enum|struct|typename)\s+)(?!<keyword>)\w+/.source.replace(/<keyword>/g,(function(){return t.source}))),lookbehind:!0},/\b[A-Z]\w*(?=\s*::\s*\w+\s*\()/,/\b[A-Z_]\w*(?=\s*::\s*~\w+\s*\()/i,/\b\w+(?=\s*<(?:[^<>]|<(?:[^<>]|<[^<>]*>)*>)*>\s*::\s*\w+\s*\()/],keyword:t,number:{pattern:/(?:\b0b[01']+|\b0x(?:[\da-f']+(?:\.[\da-f']*)?|\.[\da-f']+)(?:p[+-]?[\d']+)?|(?:\b[\d']+(?:\.[\d']*)?|\B\.[\d']+)(?:e[+-]?[\d']+)?)[ful]{0,4}/i,greedy:!0},operator:/>>=?|<<=?|->|--|\+\+|&&|\|\||[?:~]|<=>|[-+*/%&|^!=<>]=?|\b(?:and|and_eq|bitand|bitor|not|not_eq|or|or_eq|xor|xor_eq)\b/,boolean:/\b(?:false|true)\b/}),e.languages.insertBefore("cpp","string",{module:{pattern:RegExp(/(\b(?:import|module)\s+)/.source+"(?:"+/"(?:\\(?:\r\n|[\s\S])|[^"\\\r\n])*"|<[^<>\r\n]*>/.source+"|"+/<mod-name>(?:\s*:\s*<mod-name>)?|:\s*<mod-name>/.source.replace(/<mod-name>/g,(function(){return n}))+")"),lookbehind:!0,greedy:!0,inside:{string:/^[<"][\s\S]+/,operator:/:/,punctuation:/\./}},"raw-string":{pattern:/R"([^()\\ 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t=e.stateNode;t.pendingContext?Ra(0,t.pendingContext,t.pendingContext!==t.context):t.context&&Ra(0,t.context,!1),ai(e,t.containerInfo)}function Ls(e,t,n,r,a){return go(),ho(a),t.flags|=256,ks(e,t,n,r),t.child}var Ps,Is,Rs,Os,Fs={dehydrated:null,treeContext:null,retryLane:0};function Ms(e){return{baseLanes:e,cachePool:null,transitions:null}}function Ds(e,t,n){var r,a=t.pendingProps,i=li.current,s=!1,l=0!=(128&t.flags);if((r=l)||(r=(null===e||null!==e.memoizedState)&&0!=(2&i)),r?(s=!0,t.flags&=-129):null!==e&&null===e.memoizedState||(i|=1),Ca(li,1&i),null===e)return 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e.languages.tsx["literal-property"],e.languages.tsx.tag)).pattern=RegExp(/(^|[^\w$]|(?=<\/))/.source+"(?:"+t.pattern.source+")",t.pattern.flags),t.lookbehind=!0}(C),C.languages.swift={comment:{pattern:/(^|[^\\:])(?:\/\/.*|\/\*(?:[^/*]|\/(?!\*)|\*(?!\/)|\/\*(?:[^*]|\*(?!\/))*\*\/)*\*\/)/,lookbehind:!0,greedy:!0},"string-literal":[{pattern:RegExp(/(^|[^"#])/.source+"(?:"+/"(?:\\(?:\((?:[^()]|\([^()]*\))*\)|\r\n|[^(])|[^\\\r\n"])*"/.source+"|"+/"""(?:\\(?:\((?:[^()]|\([^()]*\))*\)|[^(])|[^\\"]|"(?!""))*"""/.source+")"+/(?!["#])/.source),lookbehind:!0,greedy:!0,inside:{interpolation:{pattern:/(\\\()(?:[^()]|\([^()]*\))*(?=\))/,lookbehind:!0,inside:null},"interpolation-punctuation":{pattern:/^\)|\\\($/,alias:"punctuation"},punctuation:/\\(?=[\r\n])/,string:/[\s\S]+/}},{pattern:RegExp(/(^|[^"#])(#+)/.source+"(?:"+/"(?:\\(?:#+\((?:[^()]|\([^()]*\))*\)|\r\n|[^#])|[^\\\r\n])*?"/.source+"|"+/"""(?:\\(?:#+\((?:[^()]|\([^()]*\))*\)|[^#])|[^\\])*?"""/.source+")\\2"),lookbehind:!0,greedy:!0,inside:{interpolation:{pattern:/(\\#+\()(?:[^()]|\([^()]*\))*(?=\))/,lookbehind:!0,inside:null},"interpolation-punctuation":{pattern:/^\)|\\#+\($/,alias:"punctuation"},string:/[\s\S]+/}}],directive:{pattern:RegExp(/#/.source+"(?:"+/(?:elseif|if)\b/.source+"(?:[ 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e.languages.kotlin["class-name"];var t={"interpolation-punctuation":{pattern:/^\$\{?|\}$/,alias:"punctuation"},expression:{pattern:/[\s\S]+/,inside:e.languages.kotlin}};e.languages.insertBefore("kotlin","string",{"string-literal":[{pattern:/"""(?:[^$]|\$(?:(?!\{)|\{[^{}]*\}))*?"""/,alias:"multiline",inside:{interpolation:{pattern:/\$(?:[a-z_]\w*|\{[^{}]*\})/i,inside:t},string:/[\s\S]+/}},{pattern:/"(?:[^"\\\r\n$]|\\.|\$(?:(?!\{)|\{[^{}]*\}))*"/,alias:"singleline",inside:{interpolation:{pattern:/((?:^|[^\\])(?:\\{2})*)\$(?:[a-z_]\w*|\{[^{}]*\})/i,lookbehind:!0,inside:t},string:/[\s\S]+/}}],char:{pattern:/'(?:[^'\\\r\n]|\\(?:.|u[a-fA-F0-9]{0,4}))'/,greedy:!0}}),delete e.languages.kotlin.string,e.languages.insertBefore("kotlin","keyword",{annotation:{pattern:/\B@(?:\w+:)?(?:[A-Z]\w*|\[[^\]]+\])/,alias:"builtin"}}),e.languages.insertBefore("kotlin","function",{label:{pattern:/\b\w+@|@\w+\b/,alias:"symbol"}}),e.languages.kt=e.languages.kotlin,e.languages.kts=e.languages.kotlin}(C),C.languages.c=C.languages.extend("clike",{comment:{pattern:/\/\/(?:[^\r\n\\]|\\(?:\r\n?|\n|(?![\r\n])))*|\/\*[\s\S]*?(?:\*\/|$)/,greedy:!0},string:{pattern:/"(?:\\(?:\r\n|[\s\S])|[^"\\\r\n])*"/,greedy:!0},"class-name":{pattern:/(\b(?:enum|struct)\s+(?:__attribute__\s*\(\([\s\S]*?\)\)\s*)?)\w+|\b[a-z]\w*_t\b/,lookbehind:!0},keyword:/\b(?:_Alignas|_Alignof|_Atomic|_Bool|_Complex|_Generic|_Imaginary|_Noreturn|_Static_assert|_Thread_local|__attribute__|asm|auto|break|case|char|const|continue|default|do|double|else|enum|extern|float|for|goto|if|inline|int|long|register|return|short|signed|sizeof|static|struct|switch|typedef|typeof|union|unsigned|void|volatile|while)\b/,function:/\b[a-z_]\w*(?=\s*\()/i,number:/(?:\b0x(?:[\da-f]+(?:\.[\da-f]*)?|\.[\da-f]+)(?:p[+-]?\d+)?|(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:e[+-]?\d+)?)[ful]{0,4}/i,operator:/>>=?|<<=?|->|([-+&|:])\1|[?:~]|[-+*/%&|^!=<>]=?/}),C.languages.insertBefore("c","string",{char:{pattern:/'(?:\\(?:\r\n|[\s\S])|[^'\\\r\n]){0,32}'/,greedy:!0}}),C.languages.insertBefore("c","string",{macro:{pattern:/(^[\t 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C.languages.c.boolean,C.languages.objectivec=C.languages.extend("c",{string:{pattern:/@?"(?:\\(?:\r\n|[\s\S])|[^"\\\r\n])*"/,greedy:!0},keyword:/\b(?:asm|auto|break|case|char|const|continue|default|do|double|else|enum|extern|float|for|goto|if|in|inline|int|long|register|return|self|short|signed|sizeof|static|struct|super|switch|typedef|typeof|union|unsigned|void|volatile|while)\b|(?:@interface|@end|@implementation|@protocol|@class|@public|@protected|@private|@property|@try|@catch|@finally|@throw|@synthesize|@dynamic|@selector)\b/,operator:/-[->]?|\+\+?|!=?|<<?=?|>>?=?|==?|&&?|\|\|?|[~^%?*\/@]/}),delete C.languages.objectivec["class-name"],C.languages.objc=C.languages.objectivec,C.languages.reason=C.languages.extend("clike",{string:{pattern:/"(?:\\(?:\r\n|[\s\S])|[^\\\r\n"])*"/,greedy:!0},"class-name":/\b[A-Z]\w*/,keyword:/\b(?:and|as|assert|begin|class|constraint|do|done|downto|else|end|exception|external|for|fun|function|functor|if|in|include|inherit|initializer|lazy|let|method|module|mutable|new|nonrec|object|of|open|or|private|rec|sig|struct|switch|then|to|try|type|val|virtual|when|while|with)\b/,operator:/\.{3}|:[:=]|\|>|->|=(?:==?|>)?|<=?|>=?|[|^?'#!~`]|[+\-*\/]\.?|\b(?:asr|land|lor|lsl|lsr|lxor|mod)\b/}),C.languages.insertBefore("reason","class-name",{char:{pattern:/'(?:\\x[\da-f]{2}|\\o[0-3][0-7][0-7]|\\\d{3}|\\.|[^'\\\r\n])'/,greedy:!0},constructor:/\b[A-Z]\w*\b(?!\s*\.)/,label:{pattern:/\b[a-z]\w*(?=::)/,alias:"symbol"}}),delete C.languages.reason.function,function(e){for(var t=/\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|<self>)*\*\//.source,n=0;n<2;n++)t=t.replace(/<self>/g,(function(){return t}));t=t.replace(/<self>/g,(function(){return/[^\s\S]/.source})),e.languages.rust={comment:[{pattern:RegExp(/(^|[^\\])/.source+t),lookbehind:!0,greedy:!0},{pattern:/(^|[^\\:])\/\/.*/,lookbehind:!0,greedy:!0}],string:{pattern:/b?"(?:\\[\s\S]|[^\\"])*"|b?r(#*)"(?:[^"]|"(?!\1))*"\1/,greedy:!0},char:{pattern:/b?'(?:\\(?:x[0-7][\da-fA-F]|u\{(?:[\da-fA-F]_*){1,6}\}|.)|[^\\\r\n\t'])'/,greedy:!0},attribute:{pattern:/#!?\[(?:[^\[\]"]|"(?:\\[\s\S]|[^\\"])*")*\]/,greedy:!0,alias:"attr-name",inside:{string:null}},"closure-params":{pattern:/([=(,:]\s*|\bmove\s*)\|[^|]*\||\|[^|]*\|(?=\s*(?:\{|->))/,lookbehind:!0,greedy:!0,inside:{"closure-punctuation":{pattern:/^\||\|$/,alias:"punctuation"},rest:null}},"lifetime-annotation":{pattern:/'\w+/,alias:"symbol"},"fragment-specifier":{pattern:/(\$\w+:)[a-z]+/,lookbehind:!0,alias:"punctuation"},variable:/\$\w+/,"function-definition":{pattern:/(\bfn\s+)\w+/,lookbehind:!0,alias:"function"},"type-definition":{pattern:/(\b(?:enum|struct|trait|type|union)\s+)\w+/,lookbehind:!0,alias:"class-name"},"module-declaration":[{pattern:/(\b(?:crate|mod)\s+)[a-z][a-z_\d]*/,lookbehind:!0,alias:"namespace"},{pattern:/(\b(?:crate|self|super)\s*)::\s*[a-z][a-z_\d]*\b(?:\s*::(?:\s*[a-z][a-z_\d]*\s*::)*)?/,lookbehind:!0,alias:"namespace",inside:{punctuation:/::/}}],keyword:[/\b(?:Self|abstract|as|async|await|become|box|break|const|continue|crate|do|dyn|else|enum|extern|final|fn|for|if|impl|in|let|loop|macro|match|mod|move|mut|override|priv|pub|ref|return|self|static|struct|super|trait|try|type|typeof|union|unsafe|unsized|use|virtual|where|while|yield)\b/,/\b(?:bool|char|f(?:32|64)|[ui](?:8|16|32|64|128|size)|str)\b/],function:/\b[a-z_]\w*(?=\s*(?:::\s*<|\())/,macro:{pattern:/\b\w+!/,alias:"property"},constant:/\b[A-Z_][A-Z_\d]+\b/,"class-name":/\b[A-Z]\w*\b/,namespace:{pattern:/(?:\b[a-z][a-z_\d]*\s*::\s*)*\b[a-z][a-z_\d]*\s*::(?!\s*<)/,inside:{punctuation:/::/}},number:/\b(?:0x[\dA-Fa-f](?:_?[\dA-Fa-f])*|0o[0-7](?:_?[0-7])*|0b[01](?:_?[01])*|(?:(?:\d(?:_?\d)*)?\.)?\d(?:_?\d)*(?:[Ee][+-]?\d+)?)(?:_?(?:f32|f64|[iu](?:8|16|32|64|size)?))?\b/,boolean:/\b(?:false|true)\b/,punctuation:/->|\.\.=|\.{1,3}|::|[{}[\];(),:]/,operator:/[-+*\/%!^]=?|=[=>]?|&[&=]?|\|[|=]?|<<?=?|>>?=?|[@?]/},e.languages.rust["closure-params"].inside.rest=e.languages.rust,e.languages.rust.attribute.inside.string=e.languages.rust.string}(C),C.languages.go=C.languages.extend("clike",{string:{pattern:/(^|[^\\])"(?:\\.|[^"\\\r\n])*"|`[^`]*`/,lookbehind:!0,greedy:!0},keyword:/\b(?:break|case|chan|const|continue|default|defer|else|fallthrough|for|func|go(?:to)?|if|import|interface|map|package|range|return|select|struct|switch|type|var)\b/,boolean:/\b(?:_|false|iota|nil|true)\b/,number:[/\b0(?:b[01_]+|o[0-7_]+)i?\b/i,/\b0x(?:[a-f\d_]+(?:\.[a-f\d_]*)?|\.[a-f\d_]+)(?:p[+-]?\d+(?:_\d+)*)?i?(?!\w)/i,/(?:\b\d[\d_]*(?:\.[\d_]*)?|\B\.\d[\d_]*)(?:e[+-]?[\d_]+)?i?(?!\w)/i],operator:/[*\/%^!=]=?|\+[=+]?|-[=-]?|\|[=|]?|&(?:=|&|\^=?)?|>(?:>=?|=)?|<(?:<=?|=|-)?|:=|\.\.\./,builtin:/\b(?:append|bool|byte|cap|close|complex|complex(?:64|128)|copy|delete|error|float(?:32|64)|u?int(?:8|16|32|64)?|imag|len|make|new|panic|print(?:ln)?|real|recover|rune|string|uintptr)\b/}),C.languages.insertBefore("go","string",{char:{pattern:/'(?:\\.|[^'\\\r\n]){0,10}'/,greedy:!0}}),delete C.languages.go["class-name"],function(e){var t=/\b(?:alignas|alignof|asm|auto|bool|break|case|catch|char|char16_t|char32_t|char8_t|class|co_await|co_return|co_yield|compl|concept|const|const_cast|consteval|constexpr|constinit|continue|decltype|default|delete|do|double|dynamic_cast|else|enum|explicit|export|extern|final|float|for|friend|goto|if|import|inline|int|int16_t|int32_t|int64_t|int8_t|long|module|mutable|namespace|new|noexcept|nullptr|operator|override|private|protected|public|register|reinterpret_cast|requires|return|short|signed|sizeof|static|static_assert|static_cast|struct|switch|template|this|thread_local|throw|try|typedef|typeid|typename|uint16_t|uint32_t|uint64_t|uint8_t|union|unsigned|using|virtual|void|volatile|wchar_t|while)\b/,n=/\b(?!<keyword>)\w+(?:\s*\.\s*\w+)*\b/.source.replace(/<keyword>/g,(function(){return t.source}));e.languages.cpp=e.languages.extend("c",{"class-name":[{pattern:RegExp(/(\b(?:class|concept|enum|struct|typename)\s+)(?!<keyword>)\w+/.source.replace(/<keyword>/g,(function(){return t.source}))),lookbehind:!0},/\b[A-Z]\w*(?=\s*::\s*\w+\s*\()/,/\b[A-Z_]\w*(?=\s*::\s*~\w+\s*\()/i,/\b\w+(?=\s*<(?:[^<>]|<(?:[^<>]|<[^<>]*>)*>)*>\s*::\s*\w+\s*\()/],keyword:t,number:{pattern:/(?:\b0b[01']+|\b0x(?:[\da-f']+(?:\.[\da-f']*)?|\.[\da-f']+)(?:p[+-]?[\d']+)?|(?:\b[\d']+(?:\.[\d']*)?|\B\.[\d']+)(?:e[+-]?[\d']+)?)[ful]{0,4}/i,greedy:!0},operator:/>>=?|<<=?|->|--|\+\+|&&|\|\||[?:~]|<=>|[-+*/%&|^!=<>]=?|\b(?:and|and_eq|bitand|bitor|not|not_eq|or|or_eq|xor|xor_eq)\b/,boolean:/\b(?:false|true)\b/}),e.languages.insertBefore("cpp","string",{module:{pattern:RegExp(/(\b(?:import|module)\s+)/.source+"(?:"+/"(?:\\(?:\r\n|[\s\S])|[^"\\\r\n])*"|<[^<>\r\n]*>/.source+"|"+/<mod-name>(?:\s*:\s*<mod-name>)?|:\s*<mod-name>/.source.replace(/<mod-name>/g,(function(){return n}))+")"),lookbehind:!0,greedy:!0,inside:{string:/^[<"][\s\S]+/,operator:/:/,punctuation:/\./}},"raw-string":{pattern:/R"([^()\\ 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b/blog/2023/08/02/copr/index.html @@ -2,7 +2,7 @@ <html lang="en" dir="ltr" class="blog-wrapper blog-post-page plugin-blog plugin-id-blog" data-has-hydrated="false"> <head> <meta charset="UTF-8"> -<meta name="generator" content="Docusaurus v3.0.1"> +<meta name="generator" content="Docusaurus v3.1.1"> <title data-rh="true">How can Copr help with broken dependencies | mf @@ -14,11 +14,11 @@ - - + + -

        How can Copr help with broken dependencies

        · 4 min read
        Matej Focko

        When you decide to run Fedora on your VPS, you might get screwed over by using +

        How can Copr help with broken dependencies

        · 4 min read
        Matej Focko

        When you decide to run Fedora on your VPS, you might get screwed over by using random repositories…

        When I “reserved” my VPS1 back in June '20, I slapped Fedora on it without thinking. I bet 99% of people would say that I'm crazy for doing such thing2, @@ -92,6 +92,6 @@ on one of my “home servers”, before getting the VPS. You could say I like to live on the edge… ↩

        • -
      +
      \ No newline at end of file diff --git a/blog/2024/01/28/rust-opinion/index.html b/blog/2024/01/28/rust-opinion/index.html new file mode 100644 index 0000000..43dd31e --- /dev/null +++ b/blog/2024/01/28/rust-opinion/index.html @@ -0,0 +1,289 @@ + + + + + +Mixed feelings on Rust | mf + + + + + + + + + + + + + + +

      Mixed feelings on Rust

      · 16 min read
      Matej Focko

      Rust has become a rather popular language these days. I've managed to get my +hands dirty with it during Advent of Code ‘22 and partially ‘23. I've also +used it for few rounds of Codeforces and I have to try very hard to maintain +some variety of languages for LeetCode challenges along with the Rust. I'll +disclaim up front that I won't be only positive, since this post is a result of +multiple discussions about Rust and I stand behind +“All that glitters is not gold”, so if you can't stand your favorite language +being criticized in any way, don't even proceed. 😉

      +

      Memory safety​

      +

      I'll start by kicking the biggest benefit of the language, the memory safety. +Let's be honest here, majority of the checks rely on the static analysis, cause +you can't do anything else during the compile-time, right? Therefore we can +basically say that we are relying on the compiler to “solve” all of our issues.

      +
      warning

      I'm not doubting the fact that compiler can prevent a lot of the memory +errors, I'm just saying it's not realistic to cover everything.

      +

      Compiler​

      +

      I guess we can safely1 agree on the fact that we 100% rely on the compiler to +have our back. Is the compiler bug-free? I doubt it. This is not meant in an +offensive way to the Rust compiler developers, but we need to be realistic here. +It's a compiler, even older and larger projects like gcc or llvm can't avoid +bugs to appear.

      +

      When I was trying out Rust for some of the LeetCode challenges I've stumbled +upon the following warning: +Example of a compiler bug

      +
      Issue

      The issue here comes from the fact that we have 2 simultaneous references to the +same memory (one is mutable and one immutable). If you cannot think of any way +this can break, I'll give you a rather simple example from C++ where this could +cause an issue.

      Imagine a function that has some complex object and also calls a coroutine which +utilizes read-only reference to that object. When the coroutine suspends, the +caller can modify the object. This can break the integrity of data read by the +coroutine.

        +
      • Yes, this can cause a memory error.
        • +
      • Yes, this hasn't been handled until someone noticed it.
        • +

      Fixing this bug is not backwards compatible, cause you're covering a case that +hasn't been covered before.

      +

      Enforcing the safety​

      +

      One of the ways Rust enforces the safety is by restricting what you can do, like +the example above. Aforementioned issue can happen, but doesn't have to. +Rule of the thumb in the Rust compiler is to “block” anything that can be an +issue, static analysis can't do much more, it cannot decide whether it's safe to +do it or not.

      +

      Satisfying the Rust compiler is sometimes a brutal pain in the ass, because you +cannot do things like you're used to, you need to work around them somehow.

      +
      tip

      Key difference between Rust and C or C++ lies in the fact that Rust chooses to +ban all “potentially offensive” actions, C and C++ relies on you to be +sure it's safe to do.

      C++ v. Rust

      +

      Consequences​

      +

      Where are we heading with this approach of “if it compiles, it runs” though? +In this aspect I have a rather similar opinion as with regards to the ChatGPT +and its derivatives.

      +

      If you teach people to 100% depend on the compiler, they will do it, cause it's +easy. All you need to do is make the compiler shut up2. Giving up the +intellectual masturbation about the memory safety will make you lose your edge +over the time. When we get to the point of everyone being in the mindset +mentioned above, who's going to maintain the compiler? This is the place where +you need to think about the memory safety and furthermore in a much more +general way than in your own projects, because it is the thing that everyone +blindly believes in in the end.

      +

      I'm not saying that everyone should give up Rust and think about their memory +management and potential memory issues. I'm just saying that going the easy way +will make people dull and they should think about it anyways, that's how the +issue above has been discovered. If everyone walked past and didn't think about +it, no one would discover this issue till it bit them hard.

      +
      Standard library

      Even the standard library is littered with unsafe blocks that are prefixed +with comments in style:

      // SAFETY: …

      The fact that the casual Rust dev doesn't have to think much about safety, +cause the compiler has their back, doesn't mean that the Rust compiler dev +doesn't either.

      I gotta admit that I adopted this concept in other languages (even in Python), +cause you can encounter situations where it doesn't have to be clear why you +can do what you're doing.

      +

      Development & design​

      +

      Development of Rust is… very fast. One positive is that they're trying to be as +backward compatible as possible at least by verifying against all the published +crates in the process. Of course, you cannot be backward compatible about fixing +the bugs that have been found, but such is life.

      +

      Fast development cycle​

      +

      One of the negatives of the fast development cycle is the fact that they're +using the latest features already in the next release of the Rust. Yes, it is +something that you can use for verifying and testing your own changes, but at +the same time it places a requirement of the latest release to compile the next +one.

      +
      tip

      If you check gcc for example, they have a requirement of minimal version of +compiler that you need for the build. Though gcc's requirement is not so needy +as the Rust one.

      +

      One of the other negatives is the introduction of bugs. If you're pushing +changes, somewhat mindlessly, at such a fast pace, it is inevitable to introduce +a bunch bugs in the process. Checking the GitHub issue tracker with

      +
      is:issue is:open label:C-bug label:T-compiler
      +

      yields 2,224 open issues at the time of writing this post.

      +

      RFCs​

      +

      You can find a lot of RFCs for the Rust. Some of them are more questionable +than the others. Fun thing is that a lot of them make it to the nightly builds, +so they can be tested and polished off. Even the questionable ones… I'll leave +few examples for a better understanding.

      +

      One of such features is the do yeet expression:

      +
      #![feature(yeet_expr)]

      fn foo() -> Result<String, i32> {
          do yeet 4;
      }
      assert_eq!(foo(), Err(4));

      fn bar() -> Option<String> {
          do yeet;
      }
      assert_eq!(bar(), None);
      +

      It allows you to “yeet” the errors out of the functions that return Result or +Option.

      +

      One of the more recent ones is +the ability to include Cargo manifests into the sources, so you can do something +like:

      +
      #!/usr/bin/env cargo
      ---
      [dependencies]
      clap = { version = "4.2", features = ["derive"] }
      ---

      use clap::Parser;

      #[derive(Parser, Debug)]
      #[clap(version)]
      struct Args {
          #[clap(short, long, help = "Path to config")]
          config: Option<std::path::PathBuf>,
      }

      fn main() {
          let args = Args::parse();
          println!("{:?}", args);
      }
      +

      I would say you can get almost anything into the language…

      +

      Community and hype train​

      +

      Rust community is a rather unique thing. A lot of people will hate me for this, +but I can't help, but to compare them to militant vegans. I'll go through some +of the things related to it, so I can support my opinion at least.

      +

      Rust is the best language. It is not. There is no best language, each has its +own positives and negatives, you need to choose the language that's the most +suitable for your use case. There are areas where Rust excels, though I have +to admit it's very close to being a universal hammer regardless of how suitable +it is. There is a very steep learning curve to it, beginnings in Rust are very +painful.

      +

      Rewrite everything in Rust. Just no. There are multiple feedbacks on doing +rewrites, it is very common to fix N bugs with a rewrite while introducing +N + 1 other bugs in the process. It doesn't solve anything unless there are +some strong reasons to go with it. Majority of such suggested rewrites don't +have those reasons though.

      +

      Language ‹x› is bad, though in Rust… Cherry-picking one specific pain point of +one language and reflecting how it is better in other language can go both ways. +For example it is rather easy to pick the limitations imposed by Rust compiler +and show how it's possible in other languages 🤷‍♂️

      +

      I don't mind any of those opinions, you're free to have them, as long as you +don't rub them in my face which is not the usual case… This experience makes it +just worse for me, part of this post may be also influenced by this fact.

      +

      Rust in Linux​

      +
      caution

      As someone who has seen the way Linux kernel is built in the RHEL ecosystem, how +complex the whole thing is and how much resources you need to proceed, I have +very strong opinions on this topic.

      +

      It took years of work to even “incorporate” Rust into the Linux codebase, just +to get the “Hello World!”. I don't have anything against the idea of writing +drivers in the Rust, I bet it can catch a lot of common mistakes, but still +introducing Rust to the kernel is another step to enlarge the monster.

      +

      I have to admit though that the Apple GPU driver for Linux written in Rust is +quite impressive. Apart from that there are not so many benefits, yet…

      +

      Packaging​

      +

      I'll divide the packaging into the packaging of the language itself and the +programs written in Rust.

      +

      Let's start with the cargo itself though. Package managers of the languages +usually get a lot of hate (you can take npm or pip as examples3). If +you've ever tried out Rust, I bet you already know where I'm going with this. +Yes, I mean the compilation times, or even Cargo downloading whole index of +crates just so you can update that one dependency (and 3 millions of indirect +deps). When I was doing AoC ‘22 in Rust, I've set up sccache right away on the +first day.

      +

      Let's move to the packaging of the Rust itself, it's tedious. Rust has a very +fast development cycle and doesn't even try to make the builds backward +compatible. If there is a new release of Rust, there is a very high chance that +you cannot build that release with anything other than the latest Rust +release. If you have ever touched the packaging, you know that this is something +that can cause a lot of problems, cause you need the second-to-latest version to +compile the latest version, don't forget that this applies inductively… People +running Gentoo could tell you a lot about this.

      +
      info

      Compiling the compilers takes usually more time than compiling the kernel +itself…

      +

      I cannot speak about packaging of Rust programs in other than RHEL-based +distros, though I can speak about RHEL ecosystem. Fedora packaging guidelines +specify that you need to build each and every dependency of the program +separately. I wanted to try out AlmaLinux and install Alacritty there and I +failed miserably. The solution that worked, consisted of ignoring the packaging +guidelines, running cargo build and consuming the binaries afterwards. +Dependencies of the Rust programs are of a similar nature as JS dependencies.

      +
      +

      I'm tipping my fedora1 in the general direction of the maintainers of Rust +packages in RHEL ecosystem. I wouldn't be able to do this without losing my +sanity.

      +
      +

      Likes​

      +

      If you've come all the way here and you're a Rustacean, I believe I've managed +to get your blood boiling, so it's time to finish this off by stuff I like about +Rust. I doubt I will be able to cover everything, but I can try at least. You +have to admit it's much easier to remember the bad stuff as opposed to the good. +😉

      +

      Workflow and toolchain​

      +

      I prefered using Rust for the Advent of Code and Codeforces as it provides +a rather easy way to test the solutions before running them with the challenge +input (or test runner). I can give an example from the Advent of Code:

      +
      use aoc_2023::*;

      type Output1 = i32;
      type Output2 = Output1;

      struct DayXX {}
      impl Solution<Output1, Output2> for DayXX {
          fn new<P: AsRef<Path>>(pathname: P) -> Self {
              let lines: Vec<String> = file_to_lines(pathname);

              todo!()
          }

          fn part_1(&mut self) -> Output1 {
              todo!()
          }

          fn part_2(&mut self) -> Output2 {
              todo!()
          }
      }

      fn main() -> Result<()> {
          DayXX::main()
      }

      test_sample!(day_XX, DayXX, 42, 69);
      +

      This was the skeleton I've used and the macro at the end is my own creation that +expands to:

      +
      #[cfg(test)]
      mod day_XX {
          use super::*;

          #[test]
          fn part_1() {
              let path = DayXX::get_sample(1);
              let mut day = DayXX::new(path);
              assert_eq!(day.part_1(), 42);
          }

          #[test]
          fn part_2() {
              let path = DayXX::get_sample(2);
              let mut day = DayXX::new(path);
              assert_eq!(day.part_2(), 69);
          }
      }
      +

      When you're solving the problem, all you need to do is switch between +cargo test and cargo run to check the answer to either sample or the +challenge input itself.

      +

      Introduce bacon and it gets even better. Bacon is a CLI tool that wraps around +the cargo and allows you to check, run, lint or run tests on each file save. +It's a very pleasant thing for a so-called compiler-assisted development.

      +

      Speaking of linting from within the bacon, you cannot leave out the clippy. +Not only it can whip your ass because of errors, but it can also produce a lot +of helpful suggestions, for example passing slices by borrow instead of +borrowing the Vec itself when you don't need it.

      +

      Standard library​

      +

      There's a lot included in the standard library. It almost feels like you +have all you need4. I like placeholders (like todo!(), unreachable!(), +unimplemented!()) to the extent of +implementing them as exceptions in C++.

      +

      You can find almost anything. Though you can also hit some very weird issues +with some of the nuances of the type system.

      +

      unsafe​

      +

      This might be something that people like to avoid as much as possible. However I +think that forming a habit of commenting posibly unsafe operations in any +language is a good habit, as I've mentioned above. You should be able to argue +why you can do something safely, even if the compiler is not kicking your ass +because of it.

      +

      Excerpt of such comment from work:

      +
      # SAFETY: Taking first package instead of specific package should be
      # safe, since we have put a requirement on »one« ‹upstream_project_url›
      # per Packit config, i.e. even if we're dealing with a monorepo, there
      # is only »one« upstream. If there is one upstream, there is only one
      # set of GPG keys that can be allowed.
      return self.downstream_config.packages[
          self.downstream_config._first_package
      ].allowed_gpg_keys
      +

      Traits​

      +

      One of the other things I like are the traits. They are more restrictive than +templates or concepts in C++, but they're doing their job pretty good. If you +are building library and require multiple traits to be satisfied it means a lot +of copy-paste, but that's soon to be fixed by the trait aliases.

      +
      Comparing to other languages

      On Wikipedia I've seen trait being defined as a more restrictive type class as +you may know it from the Haskell for example. C++ isn't behind either with its +constraints and concepts. I would say that we can order them in the following +order based on the complexity they can express:

      Rust's trait < Haskell's type class < C++'s concept
      +

      You can also hit some issues, like me when trying to support conversions between +underlying numeric types of a 2D vectors or support for using an operator from +both sides (I couldn't get c * u to work in the same way as u * c because +the first one requires you to implement the trait of a built-in type).

      +
      Implementation

      Implementing traits lies in

      impl SomeTrait for SomeStruct {
          // implementation goes here
      }

      One of the things I would love to see is being able to define the helper +functions within the same block. As of now, the only things allowed are the ones +that are required by the trait, which in the end results in a randomly lying +functions around (or in a implementation of the structure itself). I don't like +this mess at all…

      +

      Influence of functional paradigm​

      +

      You can see a big influence of the functional paradigm. Not only in iterators, +but also in the other parts of the language. For example I prefer Option<T> or +Result<T, E> to nulls and exceptions. Pattern matching together with +compiler both enforces handling of the errors and rather user-friendly way of +doing it.

      +

      Not to mention .and_then() and such. However spending most of the time with +the AoC you get pretty annoyed of the repetitive .unwrap() during parsing, +since you are guaranteed correct input.

      +

      Macros​

      +

      Macros are a very strong pro of the Rust. And no, we're not going to talk about +the procedural macros…

      +

      As I've shown above I've managed to “tame” a lot of copy-paste in the tests for +the AoC by utilizing a macro that generated a very basic template for the tests.

      +

      As I have mentioned the traits above, I cannot forget to give props to derive +macro that allows you to “deduce” the default implementation. It is very helpful +for a tedious tasks like implementing Debug (for printing out the structures) +or comparisons, though with the comparisons you need to be careful about the +default implementation, it has already bitten me once or twice.

      +

      Summary​

      +

      Overall there are many things about the Rust I like and would love to see them +implemented in other languages. However there are also many things I don't like. +Nothing is exclusively black and white.

      +

      Footnotes​

      +
        +
      1. +

        pun intended ↩ ↩2

        +
        2. +
      2. +

        It's not that easy with the Rust compiler, but OK… ↩

        +
        3. +
      3. +

        not to even mention multiple different packaging standards Python has, which +is borderline https://xkcd.com/927/ ↩

        +
        4. +
      4. +

        unlike Python where there's whole universe in the language itself, yet there +are essential things not present… ↩

        +
        5. +
      +
      + + \ No newline at end of file diff --git a/blog/aoc-2022/1st-week/index.html b/blog/aoc-2022/1st-week/index.html index 5b61af5..05185af 100644 --- a/blog/aoc-2022/1st-week/index.html +++ b/blog/aoc-2022/1st-week/index.html @@ -2,7 +2,7 @@ - + 1st week of Advent of Code '22 in Rust | mf @@ -14,11 +14,11 @@ - - + + -

      1st week of Advent of Code '22 in Rust

      · 13 min read
      Matej Focko

      Let's go through the first week of Advent of Code in Rust.

      +

      1st week of Advent of Code '22 in Rust

      · 13 min read
      Matej Focko

      Let's go through the first week of Advent of Code in Rust.

      note

      If you wish to have a look at the solutions, you can follow them on my GitLab. More specifically in the /src/bin/.

      I will try to summarize my experience with using Rust for the AoC. Trying it out diff --git a/blog/aoc-2022/2nd-week/index.html b/blog/aoc-2022/2nd-week/index.html index e16e456..6820257 100644 --- a/blog/aoc-2022/2nd-week/index.html +++ b/blog/aoc-2022/2nd-week/index.html @@ -2,7 +2,7 @@ - + 2nd week of Advent of Code '22 in Rust | mf @@ -14,11 +14,11 @@ - - + + -

      2nd week of Advent of Code '22 in Rust

      · 21 min read
      Matej Focko

      Let's go through the second week of Advent of Code in Rust.

      +

      2nd week of Advent of Code '22 in Rust

      · 21 min read
      Matej Focko

      Let's go through the second week of Advent of Code in Rust.

      Day 8: Treetop Tree House​

      tl;dr

      We get a forest and we want to know how many trees are visible from the outside. Apart from that we want to find the best view.

      @@ -34,7 +34,7 @@ way:

    caution

    I'm getting familiar with Rust and starting to “abuse” it… While doing so, I'm also uncovering some “features” that I don't really like. Therefore I will mark -all of my rants with thicc «↯» mark and will try to “lock” them into their +all of my rants with thicc «↯» mark and will try to “lock” them into their own “box of hell”.

    Swapping indices​

    Relatively simple implementation, just take the values, swap them and return new diff --git a/blog/aoc-2022/3rd-week/index.html b/blog/aoc-2022/3rd-week/index.html index 46f7fef..80db746 100644 --- a/blog/aoc-2022/3rd-week/index.html +++ b/blog/aoc-2022/3rd-week/index.html @@ -2,7 +2,7 @@ - + 3rd week of Advent of Code '22 in Rust | mf @@ -14,11 +14,11 @@ - - + + -

    3rd week of Advent of Code '22 in Rust

    · 12 min read
    Matej Focko

    Let's go through the third week of Advent of Code in Rust.

    +

    3rd week of Advent of Code '22 in Rust

    · 12 min read
    Matej Focko

    Let's go through the third week of Advent of Code in Rust.

    Day 15: Beacon Exclusion Zone​

    tl;dr

    Triangulating a distress beacon based on the information from the sensors.

    Solution​

    diff --git a/blog/aoc-2022/4th-week/index.html b/blog/aoc-2022/4th-week/index.html index d6a9344..18a5a63 100644 --- a/blog/aoc-2022/4th-week/index.html +++ b/blog/aoc-2022/4th-week/index.html @@ -2,7 +2,7 @@ - + 4th week of Advent of Code '22 in Rust | mf @@ -14,11 +14,11 @@ - - + + -

    4th week of Advent of Code '22 in Rust

    · 16 min read
    Matej Focko

    Let's go through the fourth week of Advent of Code in Rust.

    +

    4th week of Advent of Code '22 in Rust

    · 16 min read
    Matej Focko

    Let's go through the fourth week of Advent of Code in Rust.

    Day 22: Monkey Map​

    tl;dr

    Simulating a movement on a 2D map with given instructions. Map becomes a cube in the 2nd part…

    @@ -233,7 +233,7 @@ the previous versions.

         #[test]
         fn test_from() {
    -        for (n, s) in EXAMPLES.iter() {
    -            assert_eq!(from_snafu(s), *n);
    +        for (&n, s) in EXAMPLES.iter() {
    +            assert_eq!(s.parse::<SNAFU>().unwrap().value, n);
             }
         }

         #[test]
         fn test_to() {
    -        for (n, s) in EXAMPLES.iter() {
    -            assert_eq!(to_snafu(*n), s.to_string());
    +        for (&n, s) in EXAMPLES.iter() {
    +            assert_eq!(SNAFU::from(n).to_string(), s.to_string());
             }

    Summary​

    Let's wrap the whole thing up! Keeping in mind both AoC and the Rust…

    -

    Finished advent calendar :smile:

    +

    Finished advent calendar :smile:

    Advent of Code​

    This year was quite fun, even though most of the solutions and posts came in later on (cough in '23 cough). Day 22 was the most obnoxious one… And also diff --git a/blog/aoc-2022/intro/index.html b/blog/aoc-2022/intro/index.html index 3ae49f1..2db0cda 100644 --- a/blog/aoc-2022/intro/index.html +++ b/blog/aoc-2022/intro/index.html @@ -2,7 +2,7 @@ - + Advent of Code '22 in Rust | mf @@ -14,11 +14,11 @@ - - + + -

    Advent of Code '22 in Rust

    · 9 min read
    Matej Focko

    Let's talk about the preparations for this year's Advent of Code.

    +

    Advent of Code '22 in Rust

    · 9 min read
    Matej Focko

    Let's talk about the preparations for this year's Advent of Code.

    Choosing a language​

    When choosing a language for AoC, you usually want a language that gives you a quick feedback which allows you to iterate quickly to the solution of the puzzle. diff --git a/blog/archive/index.html b/blog/archive/index.html index 1c3d9b0..cbef0f0 100644 --- a/blog/archive/index.html +++ b/blog/archive/index.html @@ -2,7 +2,7 @@ - + Archive | mf @@ -14,10 +14,10 @@ - - + + -

    Archive

    Archive

    2023​

    2022​

    +

    Archive

    Archive

    2024​

    2023​

    2022​

    \ No newline at end of file diff --git a/blog/atom.xml b/blog/atom.xml index 448644b..b3cf128 100644 --- a/blog/atom.xml +++ b/blog/atom.xml @@ -2,11 +2,292 @@ https://blog.mfocko.xyz/blog mf Blog - 2023-08-02T00:00:00.000Z + 2024-01-28T00:00:00.000Z https://github.com/jpmonette/feed mf's blog https://blog.mfocko.xyz/img/favicon.ico + + <![CDATA[Mixed feelings on Rust]]> + https://blog.mfocko.xyz/blog/2024/01/28/rust-opinion + + 2024-01-28T00:00:00.000Z + + Rust has become a rather popular language these days. I've managed to get my +hands dirty with it during Advent of Code ‘22 and partially ‘23. I've also +used it for few rounds of Codeforces and I have to try very hard to maintain +some variety of languages for LeetCode challenges along with the Rust. I'll +disclaim up front that I won't be only positive, since this post is a result of +multiple discussions about Rust and I stand behind +“All that glitters is not gold”, so if you can't stand your favorite language +being criticized in any way, don't even proceed. 😉

    +

    Memory safety​

    +

    I'll start by kicking the biggest benefit of the language, the memory safety. +Let's be honest here, majority of the checks rely on the static analysis, cause +you can't do anything else during the compile-time, right? Therefore we can +basically say that we are relying on the compiler to “solve” all of our issues.

    +
    warning

    I'm not doubting the fact that compiler can prevent a lot of the memory +errors, I'm just saying it's not realistic to cover everything.

    +

    Compiler​

    +

    I guess we can safely1 agree on the fact that we 100% rely on the compiler to +have our back. Is the compiler bug-free? I doubt it. This is not meant in an +offensive way to the Rust compiler developers, but we need to be realistic here. +It's a compiler, even older and larger projects like gcc or llvm can't avoid +bugs to appear.

    +

    When I was trying out Rust for some of the LeetCode challenges I've stumbled +upon the following warning: +Example of a compiler bug

    +
    Issue

    The issue here comes from the fact that we have 2 simultaneous references to the +same memory (one is mutable and one immutable). If you cannot think of any way +this can break, I'll give you a rather simple example from C++ where this could +cause an issue.

    Imagine a function that has some complex object and also calls a coroutine which +utilizes read-only reference to that object. When the coroutine suspends, the +caller can modify the object. This can break the integrity of data read by the +coroutine.

      +
    • Yes, this can cause a memory error.
      • +
    • Yes, this hasn't been handled until someone noticed it.
      • +

    Fixing this bug is not backwards compatible, cause you're covering a case that +hasn't been covered before.

    +

    Enforcing the safety​

    +

    One of the ways Rust enforces the safety is by restricting what you can do, like +the example above. Aforementioned issue can happen, but doesn't have to. +Rule of the thumb in the Rust compiler is to “block” anything that can be an +issue, static analysis can't do much more, it cannot decide whether it's safe to +do it or not.

    +

    Satisfying the Rust compiler is sometimes a brutal pain in the ass, because you +cannot do things like you're used to, you need to work around them somehow.

    +
    tip

    Key difference between Rust and C or C++ lies in the fact that Rust chooses to +ban all “potentially offensive” actions, C and C++ relies on you to be +sure it's safe to do.

    C++ v. Rust

    +

    Consequences​

    +

    Where are we heading with this approach of “if it compiles, it runs” though? +In this aspect I have a rather similar opinion as with regards to the ChatGPT +and its derivatives.

    +

    If you teach people to 100% depend on the compiler, they will do it, cause it's +easy. All you need to do is make the compiler shut up2. Giving up the +intellectual masturbation about the memory safety will make you lose your edge +over the time. When we get to the point of everyone being in the mindset +mentioned above, who's going to maintain the compiler? This is the place where +you need to think about the memory safety and furthermore in a much more +general way than in your own projects, because it is the thing that everyone +blindly believes in in the end.

    +

    I'm not saying that everyone should give up Rust and think about their memory +management and potential memory issues. I'm just saying that going the easy way +will make people dull and they should think about it anyways, that's how the +issue above has been discovered. If everyone walked past and didn't think about +it, no one would discover this issue till it bit them hard.

    +
    Standard library

    Even the standard library is littered with unsafe blocks that are prefixed +with comments in style:

    // SAFETY: …

    The fact that the casual Rust dev doesn't have to think much about safety, +cause the compiler has their back, doesn't mean that the Rust compiler dev +doesn't either.

    I gotta admit that I adopted this concept in other languages (even in Python), +cause you can encounter situations where it doesn't have to be clear why you +can do what you're doing.

    +

    Development & design​

    +

    Development of Rust is… very fast. One positive is that they're trying to be as +backward compatible as possible at least by verifying against all the published +crates in the process. Of course, you cannot be backward compatible about fixing +the bugs that have been found, but such is life.

    +

    Fast development cycle​

    +

    One of the negatives of the fast development cycle is the fact that they're +using the latest features already in the next release of the Rust. Yes, it is +something that you can use for verifying and testing your own changes, but at +the same time it places a requirement of the latest release to compile the next +one.

    +
    tip

    If you check gcc for example, they have a requirement of minimal version of +compiler that you need for the build. Though gcc's requirement is not so needy +as the Rust one.

    +

    One of the other negatives is the introduction of bugs. If you're pushing +changes, somewhat mindlessly, at such a fast pace, it is inevitable to introduce +a bunch bugs in the process. Checking the GitHub issue tracker with

    +
    is:issue is:open label:C-bug label:T-compiler
    +

    yields 2,224 open issues at the time of writing this post.

    +

    RFCs​

    +

    You can find a lot of RFCs for the Rust. Some of them are more questionable +than the others. Fun thing is that a lot of them make it to the nightly builds, +so they can be tested and polished off. Even the questionable ones… I'll leave +few examples for a better understanding.

    +

    One of such features is the do yeet expression:

    +
    #![feature(yeet_expr)]

    fn foo() -> Result<String, i32> {
        do yeet 4;
    }
    assert_eq!(foo(), Err(4));

    fn bar() -> Option<String> {
        do yeet;
    }
    assert_eq!(bar(), None);
    +

    It allows you to “yeet” the errors out of the functions that return Result or +Option.

    +

    One of the more recent ones is +the ability to include Cargo manifests into the sources, so you can do something +like:

    +
    #!/usr/bin/env cargo
    ---
    [dependencies]
    clap = { version = "4.2", features = ["derive"] }
    ---

    use clap::Parser;

    #[derive(Parser, Debug)]
    #[clap(version)]
    struct Args {
        #[clap(short, long, help = "Path to config")]
        config: Option<std::path::PathBuf>,
    }

    fn main() {
        let args = Args::parse();
        println!("{:?}", args);
    }
    +

    I would say you can get almost anything into the language…

    +

    Community and hype train​

    +

    Rust community is a rather unique thing. A lot of people will hate me for this, +but I can't help, but to compare them to militant vegans. I'll go through some +of the things related to it, so I can support my opinion at least.

    +

    Rust is the best language. It is not. There is no best language, each has its +own positives and negatives, you need to choose the language that's the most +suitable for your use case. There are areas where Rust excels, though I have +to admit it's very close to being a universal hammer regardless of how suitable +it is. There is a very steep learning curve to it, beginnings in Rust are very +painful.

    +

    Rewrite everything in Rust. Just no. There are multiple feedbacks on doing +rewrites, it is very common to fix N bugs with a rewrite while introducing +N + 1 other bugs in the process. It doesn't solve anything unless there are +some strong reasons to go with it. Majority of such suggested rewrites don't +have those reasons though.

    +

    Language ‹x› is bad, though in Rust… Cherry-picking one specific pain point of +one language and reflecting how it is better in other language can go both ways. +For example it is rather easy to pick the limitations imposed by Rust compiler +and show how it's possible in other languages 🤷‍♂️

    +

    I don't mind any of those opinions, you're free to have them, as long as you +don't rub them in my face which is not the usual case… This experience makes it +just worse for me, part of this post may be also influenced by this fact.

    +

    Rust in Linux​

    +
    caution

    As someone who has seen the way Linux kernel is built in the RHEL ecosystem, how +complex the whole thing is and how much resources you need to proceed, I have +very strong opinions on this topic.

    +

    It took years of work to even “incorporate” Rust into the Linux codebase, just +to get the “Hello World!”. I don't have anything against the idea of writing +drivers in the Rust, I bet it can catch a lot of common mistakes, but still +introducing Rust to the kernel is another step to enlarge the monster.

    +

    I have to admit though that the Apple GPU driver for Linux written in Rust is +quite impressive. Apart from that there are not so many benefits, yet…

    +

    Packaging​

    +

    I'll divide the packaging into the packaging of the language itself and the +programs written in Rust.

    +

    Let's start with the cargo itself though. Package managers of the languages +usually get a lot of hate (you can take npm or pip as examples3). If +you've ever tried out Rust, I bet you already know where I'm going with this. +Yes, I mean the compilation times, or even Cargo downloading whole index of +crates just so you can update that one dependency (and 3 millions of indirect +deps). When I was doing AoC ‘22 in Rust, I've set up sccache right away on the +first day.

    +

    Let's move to the packaging of the Rust itself, it's tedious. Rust has a very +fast development cycle and doesn't even try to make the builds backward +compatible. If there is a new release of Rust, there is a very high chance that +you cannot build that release with anything other than the latest Rust +release. If you have ever touched the packaging, you know that this is something +that can cause a lot of problems, cause you need the second-to-latest version to +compile the latest version, don't forget that this applies inductively… People +running Gentoo could tell you a lot about this.

    +
    info

    Compiling the compilers takes usually more time than compiling the kernel +itself…

    +

    I cannot speak about packaging of Rust programs in other than RHEL-based +distros, though I can speak about RHEL ecosystem. Fedora packaging guidelines +specify that you need to build each and every dependency of the program +separately. I wanted to try out AlmaLinux and install Alacritty there and I +failed miserably. The solution that worked, consisted of ignoring the packaging +guidelines, running cargo build and consuming the binaries afterwards. +Dependencies of the Rust programs are of a similar nature as JS dependencies.

    +
    +

    I'm tipping my fedora1 in the general direction of the maintainers of Rust +packages in RHEL ecosystem. I wouldn't be able to do this without losing my +sanity.

    +
    +

    Likes​

    +

    If you've come all the way here and you're a Rustacean, I believe I've managed +to get your blood boiling, so it's time to finish this off by stuff I like about +Rust. I doubt I will be able to cover everything, but I can try at least. You +have to admit it's much easier to remember the bad stuff as opposed to the good. +😉

    +

    Workflow and toolchain​

    +

    I prefered using Rust for the Advent of Code and Codeforces as it provides +a rather easy way to test the solutions before running them with the challenge +input (or test runner). I can give an example from the Advent of Code:

    +
    use aoc_2023::*;

    type Output1 = i32;
    type Output2 = Output1;

    struct DayXX {}
    impl Solution<Output1, Output2> for DayXX {
        fn new<P: AsRef<Path>>(pathname: P) -> Self {
            let lines: Vec<String> = file_to_lines(pathname);

            todo!()
        }

        fn part_1(&mut self) -> Output1 {
            todo!()
        }

        fn part_2(&mut self) -> Output2 {
            todo!()
        }
    }

    fn main() -> Result<()> {
        DayXX::main()
    }

    test_sample!(day_XX, DayXX, 42, 69);
    +

    This was the skeleton I've used and the macro at the end is my own creation that +expands to:

    +
    #[cfg(test)]
    mod day_XX {
        use super::*;

        #[test]
        fn part_1() {
            let path = DayXX::get_sample(1);
            let mut day = DayXX::new(path);
            assert_eq!(day.part_1(), 42);
        }

        #[test]
        fn part_2() {
            let path = DayXX::get_sample(2);
            let mut day = DayXX::new(path);
            assert_eq!(day.part_2(), 69);
        }
    }
    +

    When you're solving the problem, all you need to do is switch between +cargo test and cargo run to check the answer to either sample or the +challenge input itself.

    +

    Introduce bacon and it gets even better. Bacon is a CLI tool that wraps around +the cargo and allows you to check, run, lint or run tests on each file save. +It's a very pleasant thing for a so-called compiler-assisted development.

    +

    Speaking of linting from within the bacon, you cannot leave out the clippy. +Not only it can whip your ass because of errors, but it can also produce a lot +of helpful suggestions, for example passing slices by borrow instead of +borrowing the Vec itself when you don't need it.

    +

    Standard library​

    +

    There's a lot included in the standard library. It almost feels like you +have all you need4. I like placeholders (like todo!(), unreachable!(), +unimplemented!()) to the extent of +implementing them as exceptions in C++.

    +

    You can find almost anything. Though you can also hit some very weird issues +with some of the nuances of the type system.

    +

    unsafe​

    +

    This might be something that people like to avoid as much as possible. However I +think that forming a habit of commenting posibly unsafe operations in any +language is a good habit, as I've mentioned above. You should be able to argue +why you can do something safely, even if the compiler is not kicking your ass +because of it.

    +

    Excerpt of such comment from work:

    +
    # SAFETY: Taking first package instead of specific package should be
    # safe, since we have put a requirement on »one« ‹upstream_project_url›
    # per Packit config, i.e. even if we're dealing with a monorepo, there
    # is only »one« upstream. If there is one upstream, there is only one
    # set of GPG keys that can be allowed.
    return self.downstream_config.packages[
        self.downstream_config._first_package
    ].allowed_gpg_keys
    +

    Traits​

    +

    One of the other things I like are the traits. They are more restrictive than +templates or concepts in C++, but they're doing their job pretty good. If you +are building library and require multiple traits to be satisfied it means a lot +of copy-paste, but that's soon to be fixed by the trait aliases.

    +
    Comparing to other languages

    On Wikipedia I've seen trait being defined as a more restrictive type class as +you may know it from the Haskell for example. C++ isn't behind either with its +constraints and concepts. I would say that we can order them in the following +order based on the complexity they can express:

    Rust's trait < Haskell's type class < C++'s concept
    +

    You can also hit some issues, like me when trying to support conversions between +underlying numeric types of a 2D vectors or support for using an operator from +both sides (I couldn't get c * u to work in the same way as u * c because +the first one requires you to implement the trait of a built-in type).

    +
    Implementation

    Implementing traits lies in

    impl SomeTrait for SomeStruct {
        // implementation goes here
    }

    One of the things I would love to see is being able to define the helper +functions within the same block. As of now, the only things allowed are the ones +that are required by the trait, which in the end results in a randomly lying +functions around (or in a implementation of the structure itself). I don't like +this mess at all…

    +

    Influence of functional paradigm​

    +

    You can see a big influence of the functional paradigm. Not only in iterators, +but also in the other parts of the language. For example I prefer Option<T> or +Result<T, E> to nulls and exceptions. Pattern matching together with +compiler both enforces handling of the errors and rather user-friendly way of +doing it.

    +

    Not to mention .and_then() and such. However spending most of the time with +the AoC you get pretty annoyed of the repetitive .unwrap() during parsing, +since you are guaranteed correct input.

    +

    Macros​

    +

    Macros are a very strong pro of the Rust. And no, we're not going to talk about +the procedural macros…

    +

    As I've shown above I've managed to “tame” a lot of copy-paste in the tests for +the AoC by utilizing a macro that generated a very basic template for the tests.

    +

    As I have mentioned the traits above, I cannot forget to give props to derive +macro that allows you to “deduce” the default implementation. It is very helpful +for a tedious tasks like implementing Debug (for printing out the structures) +or comparisons, though with the comparisons you need to be careful about the +default implementation, it has already bitten me once or twice.

    +

    Summary​

    +

    Overall there are many things about the Rust I like and would love to see them +implemented in other languages. However there are also many things I don't like. +Nothing is exclusively black and white.

    +

    Footnotes​

    +
      +
    1. +

      pun intended ↩ ↩2

      +
      2. +
    2. +

      It's not that easy with the Rust compiler, but OK… ↩

      +
      3. +
    3. +

      not to even mention multiple different packaging standards Python has, which +is borderline https://xkcd.com/927/ ↩

      +
      4. +
    4. +

      unlike Python where there's whole universe in the language itself, yet there +are essential things not present… ↩

      +
      5. +
    +
    ]]>     + + Matej Focko + me+blog@mfocko.xyz + https://gitlab.com/mfocko + + + + + +     <![CDATA[How can Copr help with broken dependencies]]> https://blog.mfocko.xyz/blog/2023/08/02/copr @@ -320,7 +601,7 @@ the previous versions.

         #[test]
         fn test_from() {
    -        for (n, s) in EXAMPLES.iter() {
    -            assert_eq!(from_snafu(s), *n);
    +        for (&n, s) in EXAMPLES.iter() {
    +            assert_eq!(s.parse::<SNAFU>().unwrap().value, n);
             }
         }

         #[test]
         fn test_to() {
    -        for (n, s) in EXAMPLES.iter() {
    -            assert_eq!(to_snafu(*n), s.to_string());
    +        for (&n, s) in EXAMPLES.iter() {
    +            assert_eq!(SNAFU::from(n).to_string(), s.to_string());
             }

    Summary​

    Let's wrap the whole thing up! Keeping in mind both AoC and the Rust…

    -

    Finished advent calendar :smile:

    +

    Finished advent calendar :smile:

    Advent of Code​

    This year was quite fun, even though most of the solutions and posts came in later on (cough in '23 cough). Day 22 was the most obnoxious one… And also @@ -588,7 +869,7 @@ from mat[2][0], where mat is a 6 x 3 matr

    Given an m x n matrix mat of integers, sort each matrix diagonal in ascending order and return the resulting matrix.

    Example​

    -

    Image describing the problem

    +

    Image describing the problem

    Skeleton and initial adjustments​

    We are given the following skeleton for the C++ and the given challenge:

    class Solution {
    public:
        vector<vector<int>> diagonalSort(vector<vector<int>>& mat) {

        }
    };
    diff --git a/blog/feed.json b/blog/feed.json index 22db6f5..0e51b17 100644 --- a/blog/feed.json +++ b/blog/feed.json @@ -4,6 +4,24 @@ "home_page_url": "https://blog.mfocko.xyz/blog", "description": "mf's blog", "items": [ + { + "id": "https://blog.mfocko.xyz/blog/2024/01/28/rust-opinion", + "content_html": "

    Rust has become a rather popular language these days. I've managed to get my\nhands dirty with it during Advent of Code ‘22 and partially ‘23. I've also\nused it for few rounds of Codeforces and I have to try very hard to maintain\nsome variety of languages for LeetCode challenges along with the Rust. I'll\ndisclaim up front that I won't be only positive, since this post is a result of\nmultiple discussions about Rust and I stand behind\n“All that glitters is not gold”, so if you can't stand your favorite language\nbeing criticized in any way, don't even proceed. 😉

    \n

    Memory safety​

    \n

    I'll start by kicking the biggest benefit of the language, the memory safety.\nLet's be honest here, majority of the checks rely on the static analysis, cause\nyou can't do anything else during the compile-time, right? Therefore we can\nbasically say that we are relying on the compiler to “solve” all of our issues.

    \n
    warning

    I'm not doubting the fact that compiler can prevent a lot of the memory\nerrors, I'm just saying it's not realistic to cover everything.

    \n

    Compiler​

    \n

    I guess we can safely1 agree on the fact that we 100% rely on the compiler to\nhave our back. Is the compiler bug-free? I doubt it. This is not meant in an\noffensive way to the Rust compiler developers, but we need to be realistic here.\nIt's a compiler, even older and larger projects like gcc or llvm can't avoid\nbugs to appear.

    \n

    When I was trying out Rust for some of the LeetCode challenges I've stumbled\nupon the following warning:\n\"Example

    \n
    Issue

    The issue here comes from the fact that we have 2 simultaneous references to the\nsame memory (one is mutable and one immutable). If you cannot think of any way\nthis can break, I'll give you a rather simple example from C++ where this could\ncause an issue.

    Imagine a function that has some complex object and also calls a coroutine which\nutilizes read-only reference to that object. When the coroutine suspends, the\ncaller can modify the object. This can break the integrity of data read by the\ncoroutine.

      \n
    • Yes, this can cause a memory error.
      • \n
    • Yes, this hasn't been handled until someone noticed it.
      • \n

    Fixing this bug is not backwards compatible, cause you're covering a case that\nhasn't been covered before.

    \n

    Enforcing the safety​

    \n

    One of the ways Rust enforces the safety is by restricting what you can do, like\nthe example above. Aforementioned issue can happen, but doesn't have to.\nRule of the thumb in the Rust compiler is to “block” anything that can be an\nissue, static analysis can't do much more, it cannot decide whether it's safe to\ndo it or not.

    \n

    Satisfying the Rust compiler is sometimes a brutal pain in the ass, because you\ncannot do things like you're used to, you need to work around them somehow.

    \n
    tip

    Key difference between Rust and C or C++ lies in the fact that Rust chooses to\nban all “potentially offensive” actions, C and C++ relies on you to be\nsure it's safe to do.

    \"C++

    \n

    Consequences​

    \n

    Where are we heading with this approach of “if it compiles, it runs” though?\nIn this aspect I have a rather similar opinion as with regards to the ChatGPT\nand its derivatives.

    \n

    If you teach people to 100% depend on the compiler, they will do it, cause it's\neasy. All you need to do is make the compiler shut up2. Giving up the\nintellectual masturbation about the memory safety will make you lose your edge\nover the time. When we get to the point of everyone being in the mindset\nmentioned above, who's going to maintain the compiler? This is the place where\nyou need to think about the memory safety and furthermore in a much more\ngeneral way than in your own projects, because it is the thing that everyone\nblindly believes in in the end.

    \n

    I'm not saying that everyone should give up Rust and think about their memory\nmanagement and potential memory issues. I'm just saying that going the easy way\nwill make people dull and they should think about it anyways, that's how the\nissue above has been discovered. If everyone walked past and didn't think about\nit, no one would discover this issue till it bit them hard.

    \n
    Standard library

    Even the standard library is littered with unsafe blocks that are prefixed\nwith comments in style:

    // SAFETY: …

    The fact that the casual Rust dev doesn't have to think much about safety,\ncause the compiler has their back, doesn't mean that the Rust compiler dev\ndoesn't either.

    I gotta admit that I adopted this concept in other languages (even in Python),\ncause you can encounter situations where it doesn't have to be clear why you\ncan do what you're doing.

    \n

    Development & design​

    \n

    Development of Rust is… very fast. One positive is that they're trying to be as\nbackward compatible as possible at least by verifying against all the published\ncrates in the process. Of course, you cannot be backward compatible about fixing\nthe bugs that have been found, but such is life.

    \n

    Fast development cycle​

    \n

    One of the negatives of the fast development cycle is the fact that they're\nusing the latest features already in the next release of the Rust. Yes, it is\nsomething that you can use for verifying and testing your own changes, but at\nthe same time it places a requirement of the latest release to compile the next\none.

    \n
    tip

    If you check gcc for example, they have a requirement of minimal version of\ncompiler that you need for the build. Though gcc's requirement is not so needy\nas the Rust one.

    \n

    One of the other negatives is the introduction of bugs. If you're pushing\nchanges, somewhat mindlessly, at such a fast pace, it is inevitable to introduce\na bunch bugs in the process. Checking the GitHub issue tracker with

    \n
    is:issue is:open label:C-bug label:T-compiler
    \n

    yields 2,224 open issues at the time of writing this post.

    \n

    RFCs​

    \n

    You can find a lot of RFCs for the Rust. Some of them are more questionable\nthan the others. Fun thing is that a lot of them make it to the nightly builds,\nso they can be tested and polished off. Even the questionable ones… I'll leave\nfew examples for a better understanding.

    \n

    One of such features is the do yeet expression:

    \n
    #![feature(yeet_expr)]

    fn foo() -> Result<String, i32> {
        do yeet 4;
    }
    assert_eq!(foo(), Err(4));

    fn bar() -> Option<String> {
        do yeet;
    }
    assert_eq!(bar(), None);
    \n

    It allows you to “yeet” the errors out of the functions that return Result or\nOption.

    \n

    One of the more recent ones is\nthe ability to include Cargo manifests into the sources, so you can do something\nlike:

    \n
    #!/usr/bin/env cargo
    ---
    [dependencies]
    clap = { version = \"4.2\", features = [\"derive\"] }
    ---

    use clap::Parser;

    #[derive(Parser, Debug)]
    #[clap(version)]
    struct Args {
        #[clap(short, long, help = \"Path to config\")]
        config: Option<std::path::PathBuf>,
    }

    fn main() {
        let args = Args::parse();
        println!(\"{:?}\", args);
    }
    \n

    I would say you can get almost anything into the language…

    \n

    Community and hype train​

    \n

    Rust community is a rather unique thing. A lot of people will hate me for this,\nbut I can't help, but to compare them to militant vegans. I'll go through some\nof the things related to it, so I can support my opinion at least.

    \n

    Rust is the best language. It is not. There is no best language, each has its\nown positives and negatives, you need to choose the language that's the most\nsuitable for your use case. There are areas where Rust excels, though I have\nto admit it's very close to being a universal hammer regardless of how suitable\nit is. There is a very steep learning curve to it, beginnings in Rust are very\npainful.

    \n

    Rewrite everything in Rust. Just no. There are multiple feedbacks on doing\nrewrites, it is very common to fix N bugs with a rewrite while introducing\nN + 1 other bugs in the process. It doesn't solve anything unless there are\nsome strong reasons to go with it. Majority of such suggested rewrites don't\nhave those reasons though.

    \n

    Language ‹x› is bad, though in Rust… Cherry-picking one specific pain point of\none language and reflecting how it is better in other language can go both ways.\nFor example it is rather easy to pick the limitations imposed by Rust compiler\nand show how it's possible in other languages 🤷‍♂️

    \n

    I don't mind any of those opinions, you're free to have them, as long as you\ndon't rub them in my face which is not the usual case… This experience makes it\njust worse for me, part of this post may be also influenced by this fact.

    \n

    Rust in Linux​

    \n
    caution

    As someone who has seen the way Linux kernel is built in the RHEL ecosystem, how\ncomplex the whole thing is and how much resources you need to proceed, I have\nvery strong opinions on this topic.

    \n

    It took years of work to even “incorporate” Rust into the Linux codebase, just\nto get the “Hello World!”. I don't have anything against the idea of writing\ndrivers in the Rust, I bet it can catch a lot of common mistakes, but still\nintroducing Rust to the kernel is another step to enlarge the monster.

    \n

    I have to admit though that the Apple GPU driver for Linux written in Rust is\nquite impressive. Apart from that there are not so many benefits, yet…

    \n

    Packaging​

    \n

    I'll divide the packaging into the packaging of the language itself and the\nprograms written in Rust.

    \n

    Let's start with the cargo itself though. Package managers of the languages\nusually get a lot of hate (you can take npm or pip as examples3). If\nyou've ever tried out Rust, I bet you already know where I'm going with this.\nYes, I mean the compilation times, or even Cargo downloading whole index of\ncrates just so you can update that one dependency (and 3 millions of indirect\ndeps). When I was doing AoC ‘22 in Rust, I've set up sccache right away on the\nfirst day.

    \n

    Let's move to the packaging of the Rust itself, it's tedious. Rust has a very\nfast development cycle and doesn't even try to make the builds backward\ncompatible. If there is a new release of Rust, there is a very high chance that\nyou cannot build that release with anything other than the latest Rust\nrelease. If you have ever touched the packaging, you know that this is something\nthat can cause a lot of problems, cause you need the second-to-latest version to\ncompile the latest version, don't forget that this applies inductively… People\nrunning Gentoo could tell you a lot about this.

    \n
    info

    Compiling the compilers takes usually more time than compiling the kernel\nitself…

    \n

    I cannot speak about packaging of Rust programs in other than RHEL-based\ndistros, though I can speak about RHEL ecosystem. Fedora packaging guidelines\nspecify that you need to build each and every dependency of the program\nseparately. I wanted to try out AlmaLinux and install Alacritty there and I\nfailed miserably. The solution that worked, consisted of ignoring the packaging\nguidelines, running cargo build and consuming the binaries afterwards.\nDependencies of the Rust programs are of a similar nature as JS dependencies.

    \n
    \n

    I'm tipping my fedora1 in the general direction of the maintainers of Rust\npackages in RHEL ecosystem. I wouldn't be able to do this without losing my\nsanity.

    \n
    \n

    Likes​

    \n

    If you've come all the way here and you're a Rustacean, I believe I've managed\nto get your blood boiling, so it's time to finish this off by stuff I like about\nRust. I doubt I will be able to cover everything, but I can try at least. You\nhave to admit it's much easier to remember the bad stuff as opposed to the good.\n😉

    \n

    Workflow and toolchain​

    \n

    I prefered using Rust for the Advent of Code and Codeforces as it provides\na rather easy way to test the solutions before running them with the challenge\ninput (or test runner). I can give an example from the Advent of Code:

    \n
    use aoc_2023::*;

    type Output1 = i32;
    type Output2 = Output1;

    struct DayXX {}
    impl Solution<Output1, Output2> for DayXX {
        fn new<P: AsRef<Path>>(pathname: P) -> Self {
            let lines: Vec<String> = file_to_lines(pathname);

            todo!()
        }

        fn part_1(&mut self) -> Output1 {
            todo!()
        }

        fn part_2(&mut self) -> Output2 {
            todo!()
        }
    }

    fn main() -> Result<()> {
        DayXX::main()
    }

    test_sample!(day_XX, DayXX, 42, 69);
    \n

    This was the skeleton I've used and the macro at the end is my own creation that\nexpands to:

    \n
    #[cfg(test)]
    mod day_XX {
        use super::*;

        #[test]
        fn part_1() {
            let path = DayXX::get_sample(1);
            let mut day = DayXX::new(path);
            assert_eq!(day.part_1(), 42);
        }

        #[test]
        fn part_2() {
            let path = DayXX::get_sample(2);
            let mut day = DayXX::new(path);
            assert_eq!(day.part_2(), 69);
        }
    }
    \n

    When you're solving the problem, all you need to do is switch between\ncargo test and cargo run to check the answer to either sample or the\nchallenge input itself.

    \n

    Introduce bacon and it gets even better. Bacon is a CLI tool that wraps around\nthe cargo and allows you to check, run, lint or run tests on each file save.\nIt's a very pleasant thing for a so-called compiler-assisted development.

    \n

    Speaking of linting from within the bacon, you cannot leave out the clippy.\nNot only it can whip your ass because of errors, but it can also produce a lot\nof helpful suggestions, for example passing slices by borrow instead of\nborrowing the Vec itself when you don't need it.

    \n

    Standard library​

    \n

    There's a lot included in the standard library. It almost feels like you\nhave all you need4. I like placeholders (like todo!(), unreachable!(),\nunimplemented!()) to the extent of\nimplementing them as exceptions in C++.

    \n

    You can find almost anything. Though you can also hit some very weird issues\nwith some of the nuances of the type system.

    \n

    unsafe​

    \n

    This might be something that people like to avoid as much as possible. However I\nthink that forming a habit of commenting posibly unsafe operations in any\nlanguage is a good habit, as I've mentioned above. You should be able to argue\nwhy you can do something safely, even if the compiler is not kicking your ass\nbecause of it.

    \n

    Excerpt of such comment from work:

    \n
    # SAFETY: Taking first package instead of specific package should be
    # safe, since we have put a requirement on »one« ‹upstream_project_url›
    # per Packit config, i.e. even if we're dealing with a monorepo, there
    # is only »one« upstream. If there is one upstream, there is only one
    # set of GPG keys that can be allowed.
    return self.downstream_config.packages[
        self.downstream_config._first_package
    ].allowed_gpg_keys
    \n

    Traits​

    \n

    One of the other things I like are the traits. They are more restrictive than\ntemplates or concepts in C++, but they're doing their job pretty good. If you\nare building library and require multiple traits to be satisfied it means a lot\nof copy-paste, but that's soon to be fixed by the trait aliases.

    \n
    Comparing to other languages

    On Wikipedia I've seen trait being defined as a more restrictive type class as\nyou may know it from the Haskell for example. C++ isn't behind either with its\nconstraints and concepts. I would say that we can order them in the following\norder based on the complexity they can express:

    Rust's trait < Haskell's type class < C++'s concept
    \n

    You can also hit some issues, like me when trying to support conversions between\nunderlying numeric types of a 2D vectors or support for using an operator from\nboth sides (I couldn't get c * u to work in the same way as u * c because\nthe first one requires you to implement the trait of a built-in type).

    \n
    Implementation

    Implementing traits lies in

    impl SomeTrait for SomeStruct {
        // implementation goes here
    }

    One of the things I would love to see is being able to define the helper\nfunctions within the same block. As of now, the only things allowed are the ones\nthat are required by the trait, which in the end results in a randomly lying\nfunctions around (or in a implementation of the structure itself). I don't like\nthis mess at all…

    \n

    Influence of functional paradigm​

    \n

    You can see a big influence of the functional paradigm. Not only in iterators,\nbut also in the other parts of the language. For example I prefer Option<T> or\nResult<T, E> to nulls and exceptions. Pattern matching together with\ncompiler both enforces handling of the errors and rather user-friendly way of\ndoing it.

    \n

    Not to mention .and_then() and such. However spending most of the time with\nthe AoC you get pretty annoyed of the repetitive .unwrap() during parsing,\nsince you are guaranteed correct input.

    \n

    Macros​

    \n

    Macros are a very strong pro of the Rust. And no, we're not going to talk about\nthe procedural macros…

    \n

    As I've shown above I've managed to “tame” a lot of copy-paste in the tests for\nthe AoC by utilizing a macro that generated a very basic template for the tests.

    \n

    As I have mentioned the traits above, I cannot forget to give props to derive\nmacro that allows you to “deduce” the default implementation. It is very helpful\nfor a tedious tasks like implementing Debug (for printing out the structures)\nor comparisons, though with the comparisons you need to be careful about the\ndefault implementation, it has already bitten me once or twice.

    \n

    Summary​

    \n

    Overall there are many things about the Rust I like and would love to see them\nimplemented in other languages. However there are also many things I don't like.\nNothing is exclusively black and white.

    \n

    Footnotes​

    \n
      \n
    1. \n

      pun intended ↩ ↩2

      \n
      2. \n
    2. \n

      It's not that easy with the Rust compiler, but OK… ↩

      \n
      3. \n
    3. \n

      not to even mention multiple different packaging standards Python has, which\nis borderline https://xkcd.com/927/ ↩

      \n
      4. \n
    4. \n

      unlike Python where there's whole universe in the language itself, yet there\nare essential things not present… ↩

      \n
      5. \n
    \n
    ", + "url": "https://blog.mfocko.xyz/blog/2024/01/28/rust-opinion", + "title": "Mixed feelings on Rust", + "summary": "Discussing my mixed feelings about the Rust language.\n", + "date_modified": "2024-01-28T00:00:00.000Z", + "author": { + "name": "Matej Focko", + "url": "https://gitlab.com/mfocko" + }, + "tags": [ + "rust", + "memory safety", + "cult", + "hype" + ] + }, { "id": "https://blog.mfocko.xyz/blog/2023/08/02/copr", "content_html": "

    When you decide to run Fedora on your VPS, you might get screwed over by using\nrandom repositories…

    \n

    When I “reserved” my VPS1 back in June '20, I slapped Fedora on it without\nthinking. I bet 99% of people would say that I'm crazy for doing such thing2,\nBUT I've been using Fedora on my PCs for some time already and it felt very\nstable and natural to just use, even for VPS.

    \n

    One of the first things I've done was setting up a mail server. You may guess\nwhat's the fun part about having a mail server… Yes, it's all the spam you\nreceive and only then you realize how much “crap” gets filtered on free mail\nservices. To battle this problem I chose to use\nrspamd that had CentOS support, but someone\nhad a Copr repository that I used to\ninstall it.

    \n

    How does Copr repositories work?​

    \n

    If you have ever used Ubuntu, you might be familiar with the concept since it is\nvery close to PPAs.

    \n

    tl;dr of the whole process consists of

    \n
      \n
    1. enabling the Copr repository, and
      2. \n
    2. installing the desired package.
      3. \n
    \n

    So in shell you would do

    \n
    # dnf copr enable ‹copr-repository›
    # dnf install ‹package-from-the-repository›
    \n

    And… that's it! Nothing else needed! Simple, right? And literally same process\nas you would do for the PPA.

    \n
    AUR

    On the other hand, if you are familiar with the archLinux, you definitely know\nAUR and what it can do for you. Copr repository is pretty similar, but the\npackages are prebuilt in Copr and Copr repositories can carry the required\ndependencies for said packages, which simplifies the distribution, and can even\nhelp with installing singular packages (when you just need the dependency, not\neverything).

    \n

    My issue​

    \n

    Now you might wonder how would I use it on my VPS. It's rather simple, once in\n6 months a new Fedora release comes out. And you need to upgrade to newer\nrelease… You don't need to do it right away and for such setup it probably isn't\neven recommended.

    \n
    tip

    Fedora releases are supported for a year, i.e. they live 6 months till the next\nrelease and then another 6 months till another release.

    Some people prefer to run one version “behind”. If you ever decide to run it on\nyour home server or in a similar setup, it might be a pretty good idea to\nfollow. I'm using the “latest greatest”, cause why not 😄

    One way or another, you still need to bump the release every six months, unless\nyou'd bump 2 releases at once every year, which would be a decision, since, at\nleast I, cannot see any benefits in it… You don't go for “stability”, cause once\na year you switch to the latest release and then, before you bump, you use one\nyear old software, so you're not even using the latest.

    \n

    Fast-forward 2 years in the future, new Fedora release came out (October '22)\nand I was doing an upgrade. Dependencies of the rspamd have been updated and\nrspamd builds in Copr have failed and no one fixed it. Cool, so now I can\nupgrade, but can either ignore the dependencies or uninstall the rspamd…

    \n

    How can Copr help?​

    \n

    I have managed to find\nspecfile for the\nrspamd package that they use for CentOS. There were some files apart from the\nspecfile, so I had to make an SRPM locally and then… I just uploaded the SRPM\nto the Copr to\nbuild\nan RPM.

    \n

    I have switched the previous Copr repository for rspamd with my own and happily\nproceeded with the upgrade.

    \n

    Conclusion​

    \n

    Copr is heavily used for testing builds on the upstream with\nPackit. However, as you can see, it is possible to use it\nvery well for packaging your own stuff and avoiding issues (such as the one\nI have described above), if need be.

    \n

    Footnotes​

    \n
      \n
    1. \n

      vpsFree.cz ↩

      \n
      2. \n
    2. \n

      Even though I've been running archLinux on some Raspberry Pi's and also\non one of my “home servers”, before getting the VPS. You could say I like\nto live on the edge… ↩

      \n
      3. \n
    \n
    ", @@ -25,7 +43,7 @@ }, { "id": "https://blog.mfocko.xyz/blog/aoc-2022/4th-week", - "content_html": "

    Let's go through the fourth week of Advent of Code in Rust.

    \n

    Day 22: Monkey Map​

    \n
    tl;dr

    Simulating a movement on a 2D map with given instructions. Map becomes a cube in\nthe 2nd part…

    \n
    Rant

    This was the most obnoxious problem of this year… and a lot of Rust issues have\nbeen hit.

    \n

    Solution​

    \n

    It seems like a very simple problem to solve, but with very obnoxious changes in\nthe 2nd part and also it's relatively hard to decompose »properly«.

    \n

    Column iterator​

    \n

    In the first part of the problem it was needed to know the boundaries of each\nrow and column, since I stored them in Vec<Vec<char>> and padded with spaces\nto ensure I have a rectangular 2D “array”. However when you wanted to go through\neach row and column to determine the boundaries, it was very easy to do for the\nrows (cause each row is a Vec element), but not for the columns, since they\nspan multiple rows.

    \n

    For this use case I have implemented my own column iterator:

    \n
    pub struct ColumnIterator<'a, T> {
        map: &'a [Vec<T>],
        column: usize,

        i: usize,
    }

    impl<'a, T> ColumnIterator<'a, T> {
        pub fn new(map: &'a [Vec<T>], column: usize) -> ColumnIterator<'a, T> {
            Self { map, column, i: 0 }
        }
    }

    impl<'a, T> Iterator for ColumnIterator<'a, T> {
        type Item = &'a T;

        fn next(&mut self) -> Option<Self::Item> {
            if self.i >= self.map.len() {
                return None;
            }

            self.i += 1;
            Some(&self.map[self.i - 1][self.column])
        }
    }
    \n

    Given this piece of an iterator, it is very easy to factor out the common\nfunctionality between the rows and columns into:

    \n
    let mut find_boundaries = |constructor: fn(usize) -> Orientation,
                               iterator: &mut dyn Iterator<Item = &char>,
                               upper_bound,
                               i| {
        let mut first_non_empty = iterator.enumerate().skip_while(|&(_, &c)| c == ' ');
        let start = first_non_empty.next().unwrap().0 as isize;

        let mut last_non_empty = first_non_empty.skip_while(|&(_, &c)| c != ' ');
        let end = last_non_empty.next().unwrap_or((upper_bound, &'_')).0 as isize;

        boundaries.insert(constructor(i), start..end);
    };
    \n

    And then use it as such:

    \n
    // construct all horizontal boundaries
    (0..map.len()).for_each(|row| {
        find_boundaries(
            Orientation::horizontal,
            &mut map[row].iter(),
            map[row].len(),
            row,
        );
    });

    // construct all vertical boundaries
    (0..map[0].len()).for_each(|col| {
        find_boundaries(
            Orientation::vertical,
            &mut ColumnIterator::new(&map, col),
            map.len(),
            col,
        );
    });
    \n

    Walking around the map​

    \n

    Once the 2nd part got introduced, you start to think about a way how not to\ncopy-paste a lot of stuff (I haven't avoided it anyways…). In this problem, I've\nchosen to introduce a trait (i.e. interface) for 2D and 3D walker.

    \n
    trait Wrap: Clone {
        type State;

        // simulation
        fn is_blocked(&self) -> bool;
        fn step(&mut self, steps: isize);
        fn turn_left(&mut self);
        fn turn_right(&mut self);

        // movement
        fn next(&self) -> (Self::State, Direction);

        // final answer
        fn answer(&self) -> Output;
    }
    \n

    Each walker maintains its own state and also provides the functions that are\nused during the simulation. The “promised” methods are separated into:

    \n
      \n
    • simulation-related: that are used during the simulation from the .fold()
      • \n
    • movement-related: just a one method that holds most of the logic differences\nbetween 2D and 3D
      • \n
    • final answer: which extracts the proof of solution from the\nimplementation-specific walker
      • \n
    \n

    Both 2D and 3D versions borrow the original input and therefore you must\nannotate the lifetime of it:

    \n
    struct Wrap2D<'a> {
        input: &'a Input,
        position: Position,
        direction: Direction,
    }
    impl<'a> Wrap2D<'a> {
        fn new(input: &'a Input) -> Wrap2D<'a> {
    // …
    \n

    Problems​

    \n

    I have used a lot of closures for this problem and once I introduced a parameter\nthat was of unknown type (apart from the fact it implements a specific trait), I\ngot suggested a “fix” for the compilation error that resulted in something that\nwas not possible to parse, cause it, more than likely, violated the grammar.

    \n

    In a similar fashion, I have been suggested changes that led to a code that\ndidn't make sense by just looking at it (there was no need to try the changes),\nfor example one suggested change in the closure parameter caused disapperance of\nthe parameter name. 😄

    \n

    Clippy​

    \n

    I have to admit that Clippy was rather helpful here, I'll include two examples\nof rather smart suggestions.

    \n

    When writing the parsing for this problem, the first thing I have spotted on the\nchar was the .is_digit() function that takes a radix as a parameter. Clippy\nnoticed that I use radix = 10 and suggested switching to .is_ascii_digit()\nthat does exactly the same thing:

    \n
    -                .take_while(|c| c.is_digit(10))
    +                .take_while(|c| c.is_ascii_digit())
    \n

    Another useful suggestion appeared when working with the iterators and I wanted\nto get the nnn-th element from it. You know the .skip(), you know the\n.next(), just “slap” them together and we're done for 😁 Well, I got\nsuggested to use .nth() that does exactly the combination of the two mentioned\nmethods on iterators:

    \n
    -            match it.clone().skip(skip).next().unwrap() {
    +            match it.clone().nth(skip).unwrap() {
    \n

    Day 23: Unstable Diffusion​

    \n
    tl;dr

    Simulating movement of elves around with a set of specific rules.

    \n

    Solution​

    \n

    There's not much to mention since it's just a cellular automaton simulation\n(even though the AoC rules for cellular automatons usually get out of hand\n😉).

    \n

    Although I had a need to determine boundaries of the elves' positions and ended\nup with a nasty DRY violation. Knowing that you you're looking for maximum and\nminimum that are, of course, exactly the same except for initial values and\ncomparators, it looks like a rather simple fix, but typing in Rust is something\nelse, right? In the end I settled for a function that computes both boundaries\nwithout any duplication while using a closure:

    \n
    fn get_bounds(positions: &Input) -> (Vector2D<isize>, Vector2D<isize>) {
        let f = |init, cmp: &dyn Fn(isize, isize) -> isize| {
            positions
                .iter()
                .fold(Vector2D::new(init, init), |acc, elf| {
                    Vector2D::new(cmp(acc.x(), elf.x()), cmp(acc.y(), elf.y()))
                })
        };

        (f(isize::MAX, &min::<isize>), f(isize::MIN, &max::<isize>))
    }
    \n

    This function returns a pair of 2D vectors that represent opposite points of the\nbounding rectangle of all elves.

    \n

    You might ask why would we need a closure and the answer is that positions\ncannot be captured from within the nested function, only via closure. One more\nfun fact on top of that is the type of the comparator

    \n
    &dyn Fn(isize, isize) -> isize
    \n

    Once we remove the dyn keyword, compiler yells at us and also includes a way\nhow to get a more thorough explanation of the error by running

    \n

    $ rustc --explain E0782

    \n

    which shows us

    \n

    Trait objects must include the dyn keyword.

    \n

    Erroneous code example:

    \n
    trait Foo {}
    fn test(arg: Box<Foo>) {} // error!
    \n

    Trait objects are a way to call methods on types that are not known until\nruntime but conform to some trait.

    \n

    Trait objects should be formed with Box<dyn Foo>, but in the code above\ndyn is left off.

    \n

    This makes it harder to see that arg is a trait object and not a\nsimply a heap allocated type called Foo.

    \n

    To fix this issue, add dyn before the trait name.

    \n
    trait Foo {}
    fn test(arg: Box<dyn Foo>) {} // ok!
    \n

    This used to be allowed before edition 2021, but is now an error.

    \n
    Rant

    Not all of the explanations are helpful though, in some cases they might be even\nmore confusing than helpful, since they address very simple use cases.

    As you can see, even in this case there are two sides to the explanations:

      \n
    • it explains why you need to use dyn, but
      • \n
    • it still mentions that trait objects need to be heap-allocated via Box<T>\nthat, as you can see in my snippet, does not apply here 😄 IMO it's\ncaused by the fact that we are borrowing it and therefore we don't need to\ncare about the size or whereabouts of it.
      • \n
    \n
    C++ parallel

    If you dive into the explanation above, you can notice that the Box<dyn Trait>\npattern is very helpful for using types that are not known during compile-time.\nYou would use a very similar approach in C++ when parsing some data structure\nfrom input (let's say JSON for example).

    On the other hand, in this case, it doesn't really make much sense, cause you\ncan clearly see that the types are known during the compile-time, which in\nC++ could be easily resolved by templating the helper function.

    \n

    Day 24: Blizzard Basin​

    \n
    tl;dr

    Navigating your way through a basin with series of blizzards that move around\nyou as you move.

    \n
    caution

    It's second to last day and I went “bonkers” on the Rust 😄 Proceed to\nread Solution part on your own risk.

    \n

    Solution​

    \n

    You are given a map with blizzards all over the place and you're supposed to\nfind the minimum time it requires you to walk through the basin without getting\nin any of the blizzards.

    \n

    Breakdown​

    \n

    Relatively simple, yet a bit annoying, approach can be taken. It's technically\na shortest-path algorithm implementation with some relaxation restrictions and\nbeing able to stay on one position for some time, so each vertex of the graph\nis determined by the position on the map and the timestamp. I have chosen to\nuse Vector3D<usize>, since x and y attributes can be used for the position\nand, well, let's use z for a timestamp, cause why not, right? 😉

    \n

    Evaluating the blizzards​

    \n
    caution

    I think that this is the most perverted abuse of the traits in the whole 4 weeks\nof AoC in Rust…

    \n

    The blizzards move along their respective directions in time and loop around in\ntheir respective row/column. Each vertex holds position and time, so we can\njust index the basin with the vertex itself, right? Yes, we can 😈

    \n
    Fun fact

    While writing this part, I've recognized unnecessary verbosity in the code and\ncleaned it up a bit. The changed version is shown here and the original was just\nmore verbose.

    \n

    I'll skip the boring parts of checking bounds and entry/exit of the basin 😉\nWe can easily calculate positions of the blizzards using a modular arithmetics:

    \n
    impl Index<Position> for Basin {
        type Output = char;

        fn index(&self, index: Position) -> &Self::Output {
            // ‹skipped boring parts›

            // We need to account for the loops of the blizzards
            let width = self.cols - 2;
            let height = self.rows - 2;

            let blizzard_origin = |size, d, t, i| ((i - 1 + size + d * (t % size)) % size + 1) as usize;
            [
                (
                    index.y() as usize,
                    blizzard_origin(width, -1, index.z(), index.x()),
                    '>',
                ),
                (
                    index.y() as usize,
                    blizzard_origin(width, 1, index.z(), index.x()),
                    '<',
                ),
                (
                    blizzard_origin(height, -1, index.z(), index.y()),
                    index.x() as usize,
                    'v',
                ),
                (
                    blizzard_origin(height, 1, index.z(), index.y()),
                    index.x() as usize,
                    '^',
                ),
            ]
            .iter()
            .find_map(|&(y, x, direction)| {
                if self.map[y][x] == direction {
                    Some(&self.map[y][x])
                } else {
                    None
                }
            })
            .unwrap_or(&'.')
        }
    }
    \n

    As you can see, there is an expression for calculating the original position and\nit's used multiple times, so why not take it out to a lambda, right? 😉

    \n

    I couldn't get the rustfmt to format the for-loop nicely, so I've just\ndecided to go with iterating over an elements of a slice. I have used, once\nagain, a combination of two functions (find_map in this case) to do 2 things\nat once and at the end, if we haven't found any blizzard, we just return the\nempty space.

    \n

    I think it's a very nice (and naughty) way how to use the Index trait, don't\nyou think?

    \n

    Shortest-path algorithm​

    \n

    For the shortest path you can choose and adjust any of the common shortest-path\nalgorithms, in my case, I have decided to use A* instead of Dijkstra's\nalgorithm, since it better reflects the cost function.

    \n
    Comparison of costs

    With the Dijkstra's algorithm I would proceed with the time attribute used as\na priority for the queue.

    Whereas with the A*, I have chosen to use both time and Manhattan distance\nthat promotes vertices closer to the exit and with a minimum time taken.

    \n

    Cost function is, of course, a closure 😉

    \n
    let cost = |p: Position| p.z() as usize + exit.y().abs_diff(p.y()) + exit.x().abs_diff(p.x());
    \n

    And also for checking the possible moves from the current vertex, I have\nimplemented, yet another, closure that yields an iterator with the next moves:

    \n
    let next_positions = |p| {
        [(0, 0, 1), (0, -1, 1), (0, 1, 1), (-1, 0, 1), (1, 0, 1)]
            .iter()
            .filter_map(move |&(x, y, t)| {
                let next_p = p + Vector3D::new(x, y, t);

                if basin[next_p] == '.' {
                    Some(next_p)
                } else {
                    None
                }
            })
    };
    \n

    Min-heap​

    \n

    In this case I had a need to use the priority queue taking the elements with the\nlowest cost as the prioritized ones. Rust only offers you the BinaryHeap and\nthat is a max-heap. One of the ways how to achieve a min-heap is to put the\nelements in wrapped in a Reverse (as is even showed in the linked docs of\nthe BinaryHeap). However the wrapping affects the type of the heap and also\npopping the most prioritized elements yields values wrapped in the Reverse.

    \n

    For this purpose I have just taken the max-heap and wrapped it as a whole in a\nseparate structure providing just the desired methods:

    \n
    use std::cmp::{Ord, Reverse};
    use std::collections::BinaryHeap;

    pub struct MinHeap<T> {
        heap: BinaryHeap<Reverse<T>>,
    }

    impl<T: Ord> MinHeap<T> {
        pub fn new() -> MinHeap<T> {
            MinHeap {
                heap: BinaryHeap::new(),
            }
        }

        pub fn push(&mut self, item: T) {
            self.heap.push(Reverse(item))
        }

        pub fn pop(&mut self) -> Option<T> {
            self.heap.pop().map(|Reverse(x)| x)
        }
    }

    impl<T: Ord> Default for MinHeap<T> {
        fn default() -> Self {
            Self::new()
        }
    }
    \n

    Rest is just the algorithm implementation which is not that interesting.

    \n

    Day 25: Full of Hot Air​

    \n
    tl;dr

    Playing around with a numbers in a special base.

    \n

    Getting flashbacks to the IB111 Foundations of Programming… Very nice “problem”\nwith a rather easy solution, as the last day always seems to be.

    \n

    Solution​

    \n

    Implementing 2 functions, converting from the SNAFU base and back to the SNAFU\nbase representation. Let's do a bit more though! I have implemented two functions:

    \n
      \n
    • from_snafu
      • \n
    • to_snafu
      • \n
    \n

    Now it is apparent that all I do is number to string and string to number. Hmm…\nthat sounds familiar, doesn't it? Let's introduce a structure for the SNAFU numbers\nand implement the traits that we need.

    \n

    Let's start with a structure:

    \n
    #[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
    struct SNAFU {
        value: i64,
    }
    \n

    Converting from &str​

    \n

    We will start by implementing the FromStr trait that will help us parse our input.\nThis is rather simple, I can just take the from_snafu function, copy-paste it\ninto the from_str method and the number I get will be wrapped in Result and\nSNAFU structure.

    \n

    Converting to String​

    \n

    This is more fun. In some cases you need to implement only one trait and others\nare automatically implemented using that one trait. In our case, if you look in\nthe documentation, you can see that ToString trait is automatically implemented\nfor any type that implements Display trait.

    \n

    Let's implement the Display trait then. We should be able to use the to_snafu\nfunction and just take the self.value from the SNAFU structure.

    \n

    And for the convenience of tests, we can also implement a rather simple From<i64>\ntrait for the SNAFU.

    \n

    Adjusting the code​

    \n

    After those changes we need to adjust the code and tests.

    \n

    Parsing of the input is very easy, before we have used the lines, now we parse\neverything:

    \n
         fn parse_input<P: AsRef<Path>>(pathname: P) -> Input {
    -        file_to_lines(pathname)
    +        file_to_structs(pathname)
         }
    \n

    Part 1 needs to be adjusted a bit too:

    \n
         fn part_1(input: &Input) -> Output {
    -        to_snafu(input.iter().map(|s| from_snafu(s)).sum())
    +        SNAFU::from(input.iter().map(|s| s.value).sum::<i64>()).to_string()
         }
    \n

    You can also see that it simplifies the meaning a bit and it is more explicit than\nthe previous versions.

    \n

    And for the tests:

    \n
         #[test]
         fn test_from() {
    -        for (n, s) in EXAMPLES.iter() {
    -            assert_eq!(from_snafu(s), *n);
    +        for (&n, s) in EXAMPLES.iter() {
    +            assert_eq!(s.parse::<SNAFU>().unwrap().value, n);
             }
         }

         #[test]
         fn test_to() {
    -        for (n, s) in EXAMPLES.iter() {
    -            assert_eq!(to_snafu(*n), s.to_string());
    +        for (&n, s) in EXAMPLES.iter() {
    +            assert_eq!(SNAFU::from(n).to_string(), s.to_string());
             }
    \n

    Summary​

    \n

    Let's wrap the whole thing up! Keeping in mind both AoC and the Rust…

    \n

    \"Finished

    \n

    Advent of Code​

    \n

    This year was quite fun, even though most of the solutions and posts came in\nlater on (cough in '23 cough). Day 22 was the most obnoxious one… And also\nit feels like I used priority queues and tree data structures a lot 👀

    \n

    with Rust​

    \n

    I must admit that a lot of compiler warnings and errors were very useful. Even\nthough I still found some instances where they didn't help at all or cause even\nworse issues than I had. Compilation times have been addressed with the caching.

    \n

    Building my first tree data structure in Rust has been a very “interesting”\njourney. Being able to write a more generic BFS algorithm that allows you to not\nduplicate code while still mantaining the desired functionality contributes to\na very readable code.

    \n

    I am definitely much more aware of the basic things that bloated Python is\nmissing, yet Rust has them…

    \n

    Using explicit types and writing down placeholder functions with todo!()\nmacros is very pleasant, since it allows you to easily navigate the type system\nduring the development when you don't even need to be sure how are you going to\nput the smaller pieces together.

    \n

    I have used a plethora of traits and also implemented some of them to either be\nidiomatic, or exploit the syntactic sugar they offer. Deriving the default trait\nimplementation is also very helpful in a lot of cases, e.g. debugging output,\ncopying, equality comparison, etc.

    \n

    I confess to touching more “cursed” parts of the Rust, such as macros to\ndeclutter the copy-paste for tests or writing my own structures that need to\ncarry a lifetime for their own fields.

    \n

    tl;dr Relatively pleasant language until you hit brick wall 😉

    \n
    \n

    See you next year! Maybe in Rust, maybe not 🙃

    ", + "content_html": "

    Let's go through the fourth week of Advent of Code in Rust.

    \n

    Day 22: Monkey Map​

    \n
    tl;dr

    Simulating a movement on a 2D map with given instructions. Map becomes a cube in\nthe 2nd part…

    \n
    Rant

    This was the most obnoxious problem of this year… and a lot of Rust issues have\nbeen hit.

    \n

    Solution​

    \n

    It seems like a very simple problem to solve, but with very obnoxious changes in\nthe 2nd part and also it's relatively hard to decompose »properly«.

    \n

    Column iterator​

    \n

    In the first part of the problem it was needed to know the boundaries of each\nrow and column, since I stored them in Vec<Vec<char>> and padded with spaces\nto ensure I have a rectangular 2D “array”. However when you wanted to go through\neach row and column to determine the boundaries, it was very easy to do for the\nrows (cause each row is a Vec element), but not for the columns, since they\nspan multiple rows.

    \n

    For this use case I have implemented my own column iterator:

    \n
    pub struct ColumnIterator<'a, T> {
        map: &'a [Vec<T>],
        column: usize,

        i: usize,
    }

    impl<'a, T> ColumnIterator<'a, T> {
        pub fn new(map: &'a [Vec<T>], column: usize) -> ColumnIterator<'a, T> {
            Self { map, column, i: 0 }
        }
    }

    impl<'a, T> Iterator for ColumnIterator<'a, T> {
        type Item = &'a T;

        fn next(&mut self) -> Option<Self::Item> {
            if self.i >= self.map.len() {
                return None;
            }

            self.i += 1;
            Some(&self.map[self.i - 1][self.column])
        }
    }
    \n

    Given this piece of an iterator, it is very easy to factor out the common\nfunctionality between the rows and columns into:

    \n
    let mut find_boundaries = |constructor: fn(usize) -> Orientation,
                               iterator: &mut dyn Iterator<Item = &char>,
                               upper_bound,
                               i| {
        let mut first_non_empty = iterator.enumerate().skip_while(|&(_, &c)| c == ' ');
        let start = first_non_empty.next().unwrap().0 as isize;

        let mut last_non_empty = first_non_empty.skip_while(|&(_, &c)| c != ' ');
        let end = last_non_empty.next().unwrap_or((upper_bound, &'_')).0 as isize;

        boundaries.insert(constructor(i), start..end);
    };
    \n

    And then use it as such:

    \n
    // construct all horizontal boundaries
    (0..map.len()).for_each(|row| {
        find_boundaries(
            Orientation::horizontal,
            &mut map[row].iter(),
            map[row].len(),
            row,
        );
    });

    // construct all vertical boundaries
    (0..map[0].len()).for_each(|col| {
        find_boundaries(
            Orientation::vertical,
            &mut ColumnIterator::new(&map, col),
            map.len(),
            col,
        );
    });
    \n

    Walking around the map​

    \n

    Once the 2nd part got introduced, you start to think about a way how not to\ncopy-paste a lot of stuff (I haven't avoided it anyways…). In this problem, I've\nchosen to introduce a trait (i.e. interface) for 2D and 3D walker.

    \n
    trait Wrap: Clone {
        type State;

        // simulation
        fn is_blocked(&self) -> bool;
        fn step(&mut self, steps: isize);
        fn turn_left(&mut self);
        fn turn_right(&mut self);

        // movement
        fn next(&self) -> (Self::State, Direction);

        // final answer
        fn answer(&self) -> Output;
    }
    \n

    Each walker maintains its own state and also provides the functions that are\nused during the simulation. The “promised” methods are separated into:

    \n
      \n
    • simulation-related: that are used during the simulation from the .fold()
      • \n
    • movement-related: just a one method that holds most of the logic differences\nbetween 2D and 3D
      • \n
    • final answer: which extracts the proof of solution from the\nimplementation-specific walker
      • \n
    \n

    Both 2D and 3D versions borrow the original input and therefore you must\nannotate the lifetime of it:

    \n
    struct Wrap2D<'a> {
        input: &'a Input,
        position: Position,
        direction: Direction,
    }
    impl<'a> Wrap2D<'a> {
        fn new(input: &'a Input) -> Wrap2D<'a> {
    // …
    \n

    Problems​

    \n

    I have used a lot of closures for this problem and once I introduced a parameter\nthat was of unknown type (apart from the fact it implements a specific trait), I\ngot suggested a “fix” for the compilation error that resulted in something that\nwas not possible to parse, cause it, more than likely, violated the grammar.

    \n

    In a similar fashion, I have been suggested changes that led to a code that\ndidn't make sense by just looking at it (there was no need to try the changes),\nfor example one suggested change in the closure parameter caused disapperance of\nthe parameter name. 😄

    \n

    Clippy​

    \n

    I have to admit that Clippy was rather helpful here, I'll include two examples\nof rather smart suggestions.

    \n

    When writing the parsing for this problem, the first thing I have spotted on the\nchar was the .is_digit() function that takes a radix as a parameter. Clippy\nnoticed that I use radix = 10 and suggested switching to .is_ascii_digit()\nthat does exactly the same thing:

    \n
    -                .take_while(|c| c.is_digit(10))
    +                .take_while(|c| c.is_ascii_digit())
    \n

    Another useful suggestion appeared when working with the iterators and I wanted\nto get the nnn-th element from it. You know the .skip(), you know the\n.next(), just “slap” them together and we're done for 😁 Well, I got\nsuggested to use .nth() that does exactly the combination of the two mentioned\nmethods on iterators:

    \n
    -            match it.clone().skip(skip).next().unwrap() {
    +            match it.clone().nth(skip).unwrap() {
    \n

    Day 23: Unstable Diffusion​

    \n
    tl;dr

    Simulating movement of elves around with a set of specific rules.

    \n

    Solution​

    \n

    There's not much to mention since it's just a cellular automaton simulation\n(even though the AoC rules for cellular automatons usually get out of hand\n😉).

    \n

    Although I had a need to determine boundaries of the elves' positions and ended\nup with a nasty DRY violation. Knowing that you you're looking for maximum and\nminimum that are, of course, exactly the same except for initial values and\ncomparators, it looks like a rather simple fix, but typing in Rust is something\nelse, right? In the end I settled for a function that computes both boundaries\nwithout any duplication while using a closure:

    \n
    fn get_bounds(positions: &Input) -> (Vector2D<isize>, Vector2D<isize>) {
        let f = |init, cmp: &dyn Fn(isize, isize) -> isize| {
            positions
                .iter()
                .fold(Vector2D::new(init, init), |acc, elf| {
                    Vector2D::new(cmp(acc.x(), elf.x()), cmp(acc.y(), elf.y()))
                })
        };

        (f(isize::MAX, &min::<isize>), f(isize::MIN, &max::<isize>))
    }
    \n

    This function returns a pair of 2D vectors that represent opposite points of the\nbounding rectangle of all elves.

    \n

    You might ask why would we need a closure and the answer is that positions\ncannot be captured from within the nested function, only via closure. One more\nfun fact on top of that is the type of the comparator

    \n
    &dyn Fn(isize, isize) -> isize
    \n

    Once we remove the dyn keyword, compiler yells at us and also includes a way\nhow to get a more thorough explanation of the error by running

    \n

    $ rustc --explain E0782

    \n

    which shows us

    \n

    Trait objects must include the dyn keyword.

    \n

    Erroneous code example:

    \n
    trait Foo {}
    fn test(arg: Box<Foo>) {} // error!
    \n

    Trait objects are a way to call methods on types that are not known until\nruntime but conform to some trait.

    \n

    Trait objects should be formed with Box<dyn Foo>, but in the code above\ndyn is left off.

    \n

    This makes it harder to see that arg is a trait object and not a\nsimply a heap allocated type called Foo.

    \n

    To fix this issue, add dyn before the trait name.

    \n
    trait Foo {}
    fn test(arg: Box<dyn Foo>) {} // ok!
    \n

    This used to be allowed before edition 2021, but is now an error.

    \n
    Rant

    Not all of the explanations are helpful though, in some cases they might be even\nmore confusing than helpful, since they address very simple use cases.

    As you can see, even in this case there are two sides to the explanations:

      \n
    • it explains why you need to use dyn, but
      • \n
    • it still mentions that trait objects need to be heap-allocated via Box<T>\nthat, as you can see in my snippet, does not apply here 😄 IMO it's\ncaused by the fact that we are borrowing it and therefore we don't need to\ncare about the size or whereabouts of it.
      • \n
    \n
    C++ parallel

    If you dive into the explanation above, you can notice that the Box<dyn Trait>\npattern is very helpful for using types that are not known during compile-time.\nYou would use a very similar approach in C++ when parsing some data structure\nfrom input (let's say JSON for example).

    On the other hand, in this case, it doesn't really make much sense, cause you\ncan clearly see that the types are known during the compile-time, which in\nC++ could be easily resolved by templating the helper function.

    \n

    Day 24: Blizzard Basin​

    \n
    tl;dr

    Navigating your way through a basin with series of blizzards that move around\nyou as you move.

    \n
    caution

    It's second to last day and I went “bonkers” on the Rust 😄 Proceed to\nread Solution part on your own risk.

    \n

    Solution​

    \n

    You are given a map with blizzards all over the place and you're supposed to\nfind the minimum time it requires you to walk through the basin without getting\nin any of the blizzards.

    \n

    Breakdown​

    \n

    Relatively simple, yet a bit annoying, approach can be taken. It's technically\na shortest-path algorithm implementation with some relaxation restrictions and\nbeing able to stay on one position for some time, so each vertex of the graph\nis determined by the position on the map and the timestamp. I have chosen to\nuse Vector3D<usize>, since x and y attributes can be used for the position\nand, well, let's use z for a timestamp, cause why not, right? 😉

    \n

    Evaluating the blizzards​

    \n
    caution

    I think that this is the most perverted abuse of the traits in the whole 4 weeks\nof AoC in Rust…

    \n

    The blizzards move along their respective directions in time and loop around in\ntheir respective row/column. Each vertex holds position and time, so we can\njust index the basin with the vertex itself, right? Yes, we can 😈

    \n
    Fun fact

    While writing this part, I've recognized unnecessary verbosity in the code and\ncleaned it up a bit. The changed version is shown here and the original was just\nmore verbose.

    \n

    I'll skip the boring parts of checking bounds and entry/exit of the basin 😉\nWe can easily calculate positions of the blizzards using a modular arithmetics:

    \n
    impl Index<Position> for Basin {
        type Output = char;

        fn index(&self, index: Position) -> &Self::Output {
            // ‹skipped boring parts›

            // We need to account for the loops of the blizzards
            let width = self.cols - 2;
            let height = self.rows - 2;

            let blizzard_origin = |size, d, t, i| ((i - 1 + size + d * (t % size)) % size + 1) as usize;
            [
                (
                    index.y() as usize,
                    blizzard_origin(width, -1, index.z(), index.x()),
                    '>',
                ),
                (
                    index.y() as usize,
                    blizzard_origin(width, 1, index.z(), index.x()),
                    '<',
                ),
                (
                    blizzard_origin(height, -1, index.z(), index.y()),
                    index.x() as usize,
                    'v',
                ),
                (
                    blizzard_origin(height, 1, index.z(), index.y()),
                    index.x() as usize,
                    '^',
                ),
            ]
            .iter()
            .find_map(|&(y, x, direction)| {
                if self.map[y][x] == direction {
                    Some(&self.map[y][x])
                } else {
                    None
                }
            })
            .unwrap_or(&'.')
        }
    }
    \n

    As you can see, there is an expression for calculating the original position and\nit's used multiple times, so why not take it out to a lambda, right? 😉

    \n

    I couldn't get the rustfmt to format the for-loop nicely, so I've just\ndecided to go with iterating over an elements of a slice. I have used, once\nagain, a combination of two functions (find_map in this case) to do 2 things\nat once and at the end, if we haven't found any blizzard, we just return the\nempty space.

    \n

    I think it's a very nice (and naughty) way how to use the Index trait, don't\nyou think?

    \n

    Shortest-path algorithm​

    \n

    For the shortest path you can choose and adjust any of the common shortest-path\nalgorithms, in my case, I have decided to use A* instead of Dijkstra's\nalgorithm, since it better reflects the cost function.

    \n
    Comparison of costs

    With the Dijkstra's algorithm I would proceed with the time attribute used as\na priority for the queue.

    Whereas with the A*, I have chosen to use both time and Manhattan distance\nthat promotes vertices closer to the exit and with a minimum time taken.

    \n

    Cost function is, of course, a closure 😉

    \n
    let cost = |p: Position| p.z() as usize + exit.y().abs_diff(p.y()) + exit.x().abs_diff(p.x());
    \n

    And also for checking the possible moves from the current vertex, I have\nimplemented, yet another, closure that yields an iterator with the next moves:

    \n
    let next_positions = |p| {
        [(0, 0, 1), (0, -1, 1), (0, 1, 1), (-1, 0, 1), (1, 0, 1)]
            .iter()
            .filter_map(move |&(x, y, t)| {
                let next_p = p + Vector3D::new(x, y, t);

                if basin[next_p] == '.' {
                    Some(next_p)
                } else {
                    None
                }
            })
    };
    \n

    Min-heap​

    \n

    In this case I had a need to use the priority queue taking the elements with the\nlowest cost as the prioritized ones. Rust only offers you the BinaryHeap and\nthat is a max-heap. One of the ways how to achieve a min-heap is to put the\nelements in wrapped in a Reverse (as is even showed in the linked docs of\nthe BinaryHeap). However the wrapping affects the type of the heap and also\npopping the most prioritized elements yields values wrapped in the Reverse.

    \n

    For this purpose I have just taken the max-heap and wrapped it as a whole in a\nseparate structure providing just the desired methods:

    \n
    use std::cmp::{Ord, Reverse};
    use std::collections::BinaryHeap;

    pub struct MinHeap<T> {
        heap: BinaryHeap<Reverse<T>>,
    }

    impl<T: Ord> MinHeap<T> {
        pub fn new() -> MinHeap<T> {
            MinHeap {
                heap: BinaryHeap::new(),
            }
        }

        pub fn push(&mut self, item: T) {
            self.heap.push(Reverse(item))
        }

        pub fn pop(&mut self) -> Option<T> {
            self.heap.pop().map(|Reverse(x)| x)
        }
    }

    impl<T: Ord> Default for MinHeap<T> {
        fn default() -> Self {
            Self::new()
        }
    }
    \n

    Rest is just the algorithm implementation which is not that interesting.

    \n

    Day 25: Full of Hot Air​

    \n
    tl;dr

    Playing around with a numbers in a special base.

    \n

    Getting flashbacks to the IB111 Foundations of Programming… Very nice “problem”\nwith a rather easy solution, as the last day always seems to be.

    \n

    Solution​

    \n

    Implementing 2 functions, converting from the SNAFU base and back to the SNAFU\nbase representation. Let's do a bit more though! I have implemented two functions:

    \n
      \n
    • from_snafu
      • \n
    • to_snafu
      • \n
    \n

    Now it is apparent that all I do is number to string and string to number. Hmm…\nthat sounds familiar, doesn't it? Let's introduce a structure for the SNAFU numbers\nand implement the traits that we need.

    \n

    Let's start with a structure:

    \n
    #[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
    struct SNAFU {
        value: i64,
    }
    \n

    Converting from &str​

    \n

    We will start by implementing the FromStr trait that will help us parse our input.\nThis is rather simple, I can just take the from_snafu function, copy-paste it\ninto the from_str method and the number I get will be wrapped in Result and\nSNAFU structure.

    \n

    Converting to String​

    \n

    This is more fun. In some cases you need to implement only one trait and others\nare automatically implemented using that one trait. In our case, if you look in\nthe documentation, you can see that ToString trait is automatically implemented\nfor any type that implements Display trait.

    \n

    Let's implement the Display trait then. We should be able to use the to_snafu\nfunction and just take the self.value from the SNAFU structure.

    \n

    And for the convenience of tests, we can also implement a rather simple From<i64>\ntrait for the SNAFU.

    \n

    Adjusting the code​

    \n

    After those changes we need to adjust the code and tests.

    \n

    Parsing of the input is very easy, before we have used the lines, now we parse\neverything:

    \n
         fn parse_input<P: AsRef<Path>>(pathname: P) -> Input {
    -        file_to_lines(pathname)
    +        file_to_structs(pathname)
         }
    \n

    Part 1 needs to be adjusted a bit too:

    \n
         fn part_1(input: &Input) -> Output {
    -        to_snafu(input.iter().map(|s| from_snafu(s)).sum())
    +        SNAFU::from(input.iter().map(|s| s.value).sum::<i64>()).to_string()
         }
    \n

    You can also see that it simplifies the meaning a bit and it is more explicit than\nthe previous versions.

    \n

    And for the tests:

    \n
         #[test]
         fn test_from() {
    -        for (n, s) in EXAMPLES.iter() {
    -            assert_eq!(from_snafu(s), *n);
    +        for (&n, s) in EXAMPLES.iter() {
    +            assert_eq!(s.parse::<SNAFU>().unwrap().value, n);
             }
         }

         #[test]
         fn test_to() {
    -        for (n, s) in EXAMPLES.iter() {
    -            assert_eq!(to_snafu(*n), s.to_string());
    +        for (&n, s) in EXAMPLES.iter() {
    +            assert_eq!(SNAFU::from(n).to_string(), s.to_string());
             }
    \n

    Summary​

    \n

    Let's wrap the whole thing up! Keeping in mind both AoC and the Rust…

    \n

    \"Finished

    \n

    Advent of Code​

    \n

    This year was quite fun, even though most of the solutions and posts came in\nlater on (cough in '23 cough). Day 22 was the most obnoxious one… And also\nit feels like I used priority queues and tree data structures a lot 👀

    \n

    with Rust​

    \n

    I must admit that a lot of compiler warnings and errors were very useful. Even\nthough I still found some instances where they didn't help at all or cause even\nworse issues than I had. Compilation times have been addressed with the caching.

    \n

    Building my first tree data structure in Rust has been a very “interesting”\njourney. Being able to write a more generic BFS algorithm that allows you to not\nduplicate code while still mantaining the desired functionality contributes to\na very readable code.

    \n

    I am definitely much more aware of the basic things that bloated Python is\nmissing, yet Rust has them…

    \n

    Using explicit types and writing down placeholder functions with todo!()\nmacros is very pleasant, since it allows you to easily navigate the type system\nduring the development when you don't even need to be sure how are you going to\nput the smaller pieces together.

    \n

    I have used a plethora of traits and also implemented some of them to either be\nidiomatic, or exploit the syntactic sugar they offer. Deriving the default trait\nimplementation is also very helpful in a lot of cases, e.g. debugging output,\ncopying, equality comparison, etc.

    \n

    I confess to touching more “cursed” parts of the Rust, such as macros to\ndeclutter the copy-paste for tests or writing my own structures that need to\ncarry a lifetime for their own fields.

    \n

    tl;dr Relatively pleasant language until you hit brick wall 😉

    \n
    \n

    See you next year! Maybe in Rust, maybe not 🙃

    ", "url": "https://blog.mfocko.xyz/blog/aoc-2022/4th-week", "title": "4th week of Advent of Code '22 in Rust", "summary": "Surviving fourth week in Rust.", @@ -59,7 +77,7 @@ }, { "id": "https://blog.mfocko.xyz/blog/leetcode/sort-diagonally", - "content_html": "

    Let's try to solve one of the LeetCode challenges in easy and hard mode at the\nsame time.

    \n\n

    Problem description​

    \n

    A matrix diagonal is a diagonal line of cells starting from some cell in\neither the topmost row or leftmost column and going in the bottom-right direction\nuntil reaching the matrix's end. For example, the matrix diagonal starting\nfrom mat[2][0], where mat is a 6 x 3 matrix, includes cells mat[2][0],\nmat[3][1], and mat[4][2].

    \n

    Given an m x n matrix mat of integers, sort each matrix diagonal in ascending\norder and return the resulting matrix.

    \n

    Example​

    \n

    \"Image

    \n

    Skeleton and initial adjustments​

    \n

    We are given the following skeleton for the C++ and the given challenge:

    \n
    class Solution {
    public:
        vector<vector<int>> diagonalSort(vector<vector<int>>& mat) {

        }
    };
    \n

    The task is to sort the passed matrix diagonally and then return it. First of all,\nI don't like to solve this in a web browser, so we'll need to adjust it accordingly\nfor running it locally. We'll start by including the vector header and using\nfully-qualified namespaces1 and also adding few tests:

    \n
    #include <cassert>
    #include <vector>

    using matrix = std::vector<std::vector<int>>;

    class Solution {
    public:
        matrix diagonalSort(matrix& mat)
        {
        }
    };

    static void test_case_1()
    {
        // Input: mat = [[3,3,1,1],[2,2,1,2],[1,1,1,2]]
        // Output: [[1,1,1,1],[1,2,2,2],[1,2,3,3]]

        Solution s;
        assert((s.diagonalSort(std::vector { std::vector { 3, 3, 1, 1 },
                    std::vector { 2, 2, 1, 2 },
                    std::vector { 1, 1, 1, 2 } })
            == std::vector { std::vector { 1, 1, 1, 1 },
                std::vector { 1, 2, 2, 2 },
                std::vector { 1, 2, 3, 3 } }));
    }

    static void test_case_2()
    {
        // Input: mat =
        // [[11,25,66,1,69,7],[23,55,17,45,15,52],[75,31,36,44,58,8],[22,27,33,25,68,4],[84,28,14,11,5,50]]
        // Output:
        // [[5,17,4,1,52,7],[11,11,25,45,8,69],[14,23,25,44,58,15],[22,27,31,36,50,66],[84,28,75,33,55,68]]

        Solution s;
        assert((s.diagonalSort(std::vector { std::vector { 11, 25, 66, 1, 69, 7 },
                    std::vector { 23, 55, 17, 45, 15, 52 },
                    std::vector { 75, 31, 36, 44, 58, 8 },
                    std::vector { 22, 27, 33, 25, 68, 4 },
                    std::vector { 84, 28, 14, 11, 5, 50 } })
            == std::vector { std::vector { 5, 17, 4, 1, 52, 7 },
                std::vector { 11, 11, 25, 45, 8, 69 },
                std::vector { 14, 23, 25, 44, 58, 15 },
                std::vector { 22, 27, 31, 36, 50, 66 },
                std::vector { 84, 28, 75, 33, 55, 68 } }));
    }

    int main()
    {
        test_case_1();
        test_case_2();

        return 0;
    }
    \n

    We need to return the matrix, but we're given a reference to the input matrix. We\ncan easily abuse the C++ here and just switch the reference to value, this way\nthe matrix will be copied when passed to the function, we can sort the copy and\njust return it back. And we also get yelled by the compiler for the fact that the\nmethod doesn't return anything yet, so to make it “shut up” we will just return\nthe input for now:

    \n
    -    matrix diagonalSort(matrix& mat)
    +    matrix diagonalSort(matrix mat)
         {
    +        return mat;
         }
    \n

    Now, we get the copy and we're good to go.

    \n

    Naïve solution​

    \n

    As you may know, C++ offers a plethora of functions that can be used to your\nadvantage, given that you know how to “bend” the data structures accordingly.

    \n

    What does that mean for us? Well, we have an std::sort, we can use it, right?\nLet's have a look at it:

    \n
    template< class RandomIt >
    void sort( RandomIt first, RandomIt last );
    \n

    This overload is more than we need. What does it do? It just sorts the elements\nin the range [first, last) using operator< on them. We can't sort the whole\nmatrix using this, but… we can sort just »one« diagonal without doing much work\non our end.

    \n

    What is the RandomIt type though? If we look more into the documentation, we\ncan easily find the requirements for it and also learn that it's a random access\niterator and allows swapping its values at the same time.

    \n
    Random access iterator

    What is the random access iterator though? We can find it in a documentation\nand see the following description:

    \n

    A LegacyRandomAccessIterator is a LegacyBidirectionalIterator\nthat can be moved to point to any element in constant time.

    \n

    After that we can see all the requirements for it being listed. I don't feel like\nreading them right now, so we will just use it and see where the compilation blows\nup, i.e. “compiler-assisted development”2 if you will ;)

    \n

    Now we know that we can use std::sort to sort the diagonal itself, but we also\nneed to get the diagonals somehow. I'm rather lazy, so I'll just delegate it to\nsomeone else3. And that way we get

    \n
    matrix diagonalSort(matrix mat)
    {
        // we iterate over the diagonals
        for (auto d : diagonals(mat)) {
            // and we sort each diagonal
            std::sort(d.begin(), d.end());
        }

        // we take the matrix by copy, so we can sort in-situ and return the copy
        // that we sorted
        return mat;
    }
    \n

    This solution looks very simple, doesn't it? Well, cause it is.\nLet's try compiling it:

    \n
    matrix-sort.cpp:11:23: error: use of undeclared identifier 'diagonals' [clang-diagnostic-error]
            for (auto d : diagonals(mat)) {
                          ^
    Found compiler error(s).
    make: *** [makefile:14: tidy] Error 1
    \n

    OK, seems about right. We haven't implemented the diagonals yet. And based on\nwhat we've written so far, we need a function or a class diagonals that will\ngive us the diagonals we need.

    \n

    Implementing the diagonals​

    \n

    Cool, so we need the function that will let us go through each and every diagonal\nin our matrix. We use the for-range loop, so whatever we get back from the\ndiagonals must support .begin() and .end(). Since I am a masochist, we will\ndo such functionality for a matrix of any type, not just the int from the challenge.

    \n

    As I said, we need to be able to

    \n
      \n
    • construct the object
      • \n
    • get the beginning
      • \n
    • get the end (the “sentinel”)
      • \n
    \n
    template <typename T>
    class diagonals {
        using matrix_t = std::vector<std::vector<T>>;

        matrix_t& _matrix;

    public:
        diagonals(matrix_t& m)
            : _matrix(m)
        {
        }
        diagonals_iter begin()
        {
            /* TODO */
        }
        diagonals_iter end()
        {
            /* TODO */
        }
    };
    \n

    Now we have a diagonals that we can use to go through the diagonals. We haven't\nimplemented the core of it yet. Let's go through what we have for now.

    \n

    We have a templated class with templated T that is used as a placeholder for any\ntype we would store in the matrix. Because I'm lazy, I have defined the matrix_t\ntype that is a “shortcut” for std::vector<std::vector<T>>, so I don't have to\ntype it out all the time. Of course, we need to store the matrix, we are given,\nas a private attribute. And then just have the constructor and the 2 methods we\nneed for the for-range.

    \n

    Iterating over diagonals​

    \n

    Now that we have an object that will allow us to iterate through the diagonals,\nwe need to implement the iterating itself. We need to go through all of them, so\nwe have multiple options how to do so. I have decided to start from the “main”\ndiagonal that starts at (0, 0) index and then proceed with the diagonals starting\nin the first row, followed by the rest of the diagonals in the first column.

    \n

    We need to be able to tell that we've iterated through all of them, and also we\nneed to know which diagonal is next. For that purpose we will pass the indices\nof the first cell on the diagonal. That way we can always tell how to move forward.

    \n

    We will start by updating the begin and end to reflect our choice accordingly.

    \n
    diagonals_iter begin() { return diagonals_iter { _matrix, 0, 0 }; }
    diagonals_iter end() { return diagonals_iter { _matrix, 0, _matrix.size() }; }
    \n

    For the begin we return the first diagonal that starts at (0, 0). And because\nwe have decided to do the diagonals in the first column at the end, the first\ndiagonal that is not a valid one is the one at (0, height). Apart from the\nindices, we also need to pass reference to the matrix itself.

    \n
    note

    You may have noticed that we also include the diagonals that have length 1,\nspecifically the ones at (0, height - 1) and (width - 1, 0). We are implementing\nan iterator that should not care about the way it's being used. Therefore, we\ndon't care about the fact they don't need to be sorted.

    \n

    Cool, let's leave the iterator itself to someone else, right?4

    \n

    Implementing the iterator over diagonals​

    \n

    We can start with a simple skeleton based on the information that we pass from\nthe diagonals. Also to utilize the matrix_t and also contain implementation\ndetails hidden away, we will put this code into the diagonals class.

    \n
    class diagonals_iter {
        matrix_t& m;
        std::size_t x;
        std::size_t y;

    public:
        diagonals_iter(matrix_t& matrix, std::size_t x, std::size_t y)
            : m(matrix)
            , x(x)
            , y(y)
        {
        }
    };
    \n

    In this case we will be implementing a “simple” forward iterator, so we don't\nneed to implement a lot. Notably it will be:

    \n
      \n
    • inequality operator (we need to know when we reach the end and have nothing to\niterate over)
      • \n
    • preincrementation operator (we need to be able to move around the iterable)
      • \n
    • dereference operator (we need to be able to retrieve the objects we iterate\nover)
      • \n
    \n
    class diagonals_iter {
        matrix_t& m;
        std::size_t x;
        std::size_t y;

    public:
        diagonals_iter(matrix_t& matrix, std::size_t x, std::size_t y)
            : m(matrix)
            , x(x)
            , y(y)
        {
        }

        bool operator!=(const diagonals_iter& rhs) const
        {
            // iterators are not equal if they reference different matrices, or
            // their positions differ
            return m != rhs.m || x != rhs.x || y != rhs.y;
        }

        diagonals_iter& operator++()
        {
            if (y != 0) {
                // iterating through diagonals down the first column
                y++;
                return *this;
            }

            // iterating the diagonals along the first row
            x++;
            if (x == m.front().size()) {
                // switching to diagonals in the first column
                x = 0;
                y++;
            }

            return *this;
        }

        diagonal<T> operator*() const { return diagonal { m, x, y }; }
    };
    \n

    Let's go one-by-one. Inequality operator is rather simple, just compare iterator's\nattributes field-by-field. If you think about it, checking inequality of two 2D\nvectors may be a bit inefficient, therefore, we can swap around and check it as\na last thing.

    \n
    -        return m != rhs.m || x != rhs.x || y != rhs.y;
    +        return x != rhs.x || y != rhs.y || m != rhs.m;
    \n

    Preincrementation is where the magic happens. If you have a better look, you can\nsee two branches of this operation:

    \n
      \n
    1. When y != 0 (we're iterating over the diagonals in the first column)\nIn this case, we just bump the row and we're done.
      2. \n
    2. When y == 0 (we're iterating over the diagonals in the first row)\nIn this case, we bump the column and check if we haven't gotten out of bounds,\ni.e. the end of the first row. If we get out of the bounds, we're continuing\nwith the second diagonal in the first column.
      3. \n
    \n

    Dereferencing the iterator must “yield” something. In our case it will be the\ndiagonal that we want to sort. For sorting we need just the iterators that can\nmove around said diagonal. The simplest thing, we can do, is to delegate it to\nsomething else. In our case it will be a class called diagonal.

    \n

    Implementing the diagonal itself​

    \n

    After implementing the iterator over diagonals, we know that all we need to describe\na diagonal is the matrix itself and the “start” of the diagonal (row and column).\nAnd we also know that the diagonal must provide some iterators for the std::sort\nfunction. We can start with the following skeleton:

    \n
    template <typename T>
    class diagonal {
        using matrix_t = std::vector<std::vector<T>>;

        matrix_t& matrix;
        std::size_t x;
        std::size_t y;

    public:
        diagonal(matrix_t& matrix, std::size_t x, std::size_t y)
            : matrix(matrix)
            , x(x)
            , y(y)
        {
        }

        diagonal_iter begin() const { return diagonal_iter { matrix, x, y }; }

        diagonal_iter end() const
        {
            auto max_x = matrix[y].size();
            auto max_y = matrix.size();

            // we need to find the distance in which we get out of bounds (either in
            // column or row)
            auto steps = std::min(max_x - x, max_y - y);

            return diagonal_iter { matrix, x + steps, y + steps };
        }
    };
    \n

    Initialization is rather simple, we just “keep” the stuff we get, begin is the\nsimplest, we just delegate.

    \n

    In case of the end, it gets more complicated. We need to know where is the “end”\nof the diagonal. Since end should point to the first element “after” the iterable,\nwe know that it's the first position of the iterator where either y becomes\nmatrix.size() or x becomes matrix[y].size(). Also we are moving along diagonal,\nduh, therefore we can deduce the first “position” afterwards by minimal amount of\nsteps to get out of the any column or row, hence std::min(max_x - x, max_y - y).\nFinal position is then computed simply by adding the steps to the beginning of\nthe diagonal.

    \n

    Now we just need to finish the iterator for the diagonal itself and we're done.

    \n

    Implementing diagonal_iter​

    \n

    This part is the hardest from all we need to do. It's because of the requirements\nof the std::sort that requires us to implement a random access iterator. I have\nbriefly described it above, and “in a nutshell” it means that we need to implement\nan iterator that can move in constant time along the diagonal in any amount of\nsteps.

    \n

    Let's go through all of the functionality that our iterator needs to support to\nbe used in std::sort. We need the usual operations like:

    \n
      \n
    • equality/inequality
      • \n
    • incrementation
      • \n
    • dereferencing
      • \n
    \n

    We will also add all the types that our iterator uses with the category of the\niterator, i.e. what interface it supports:

    \n
    class diagonal_iter {
        // we need to keep reference to the matrix itself
        matrix_t& m;

        // we need to be able to tell our current position
        std::size_t x;
        std::size_t y;

    public:
        using difference_type = std::ptrdiff_t;
        using value_type = T;
        using pointer = T*;
        using reference = T&;
        using iterator_category = std::random_access_iterator_tag;

        diagonal_iter(matrix_t& matrix,
            std::size_t x,
            std::size_t y)
            : m(matrix)
            , x(x)
            , y(y)
        {
        }

        bool operator==(const diagonal_iter& rhs) const
        {
            return x == rhs.x && y == rhs.y && m == rhs.m;
        }

        diagonal_iter& operator++()
        {
            // we are moving along the diagonal, so we increment both ‹x› and ‹y› at
            // the same time
            x++;
            y++;
            return *this;
        }

        reference operator*() const { return m[y][x]; }
    };
    \n

    This is pretty similar to the previous iterator, but now we need to implement the\nremaining requirements of the random access iterator. Let's see what those are:

    \n
      \n
    • decrementation - cause we need to be able to move backwards too, since _random _\naccess iterator extends the interface of bidirectional iterator
      • \n
    • moving the iterator in either direction by steps given as an integer
      • \n
    • being able to tell the distance between two iterators
      • \n
    • define an ordering on the iterators
      • \n
    \n

    Let's fill them in:

    \n
    class diagonal_iter {
        // we need to keep reference to the matrix itself
        matrix_t& m;

        // we need to be able to tell our current position
        std::size_t x;
        std::size_t y;

    public:
        using difference_type = std::ptrdiff_t;
        using value_type = T;
        using pointer = T*;
        using reference = T&;
        using iterator_category = std::random_access_iterator_tag;

        diagonal_iter(matrix_t& matrix,
            std::size_t x,
            std::size_t y)
            : m(matrix)
            , x(x)
            , y(y)
        {
        }

        bool operator==(const diagonal_iter& rhs) const
        {
            return x == rhs.x && y == rhs.y && m == rhs.m;
        }

        diagonal_iter& operator++()
        {
            // we are moving along the diagonal, so we increment both ‹x› and ‹y› at
            // the same time
            x++;
            y++;
            return *this;
        }

        reference operator*() const { return m[y][x]; }

        // exactly opposite to the incrementation
        diagonal_iter operator--()
        {
            x--;
            y--;
            return *this;
        }

        // moving ‹n› steps back is same as calling decrementation ‹n›-times, so we
        // can just return a new iterator and subtract ‹n› from both coordinates in
        // the matrix
        diagonal_iter operator-(difference_type n) const
        {
            return diagonal_iter { m, x - n, y - n };
        }

        // here we assume that we are given two iterators on the same diagonal
        difference_type operator-(const diagonal_iter& rhs) const
        {
            assert(m == rhs.m);
            return x - rhs.x;
        }

        // counterpart of moving ‹n› steps backwards
        diagonal_iter operator+(difference_type n) const
        {
            return diagonal_iter { m, x + n, y + n };
        }

        // we compare the coordinates, and also assume that those 2 iterators are
        // lying on the same diagonal
        bool operator<(const diagonal_iter& rhs) const
        {
            assert(m == rhs.m);
            return x < rhs.x && y < rhs.y;
        }
    };
    \n

    At this point we could probably try and compile it, right? If we do so, we will\nget yelled at by a compiler for the following reasons:

    \n
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1792:11: error: object of type 'diagonal<int>::diagonal_iter' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]
              __last = __next;
                     ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1817:11: note: in instantiation of function template specialization 'std::__unguarded_linear_insert<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Val_less_iter>' requested here
                std::__unguarded_linear_insert(__i,
                     ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1849:9: note: in instantiation of function template specialization 'std::__insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
              std::__insertion_sort(__first, __first + int(_S_threshold), __comp);
                   ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1940:9: note: in instantiation of function template specialization 'std::__final_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
              std::__final_insertion_sort(__first, __last, __comp);
                   ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization 'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
          std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());
               ^
    matrix-sort.cpp:161:18: note: in instantiation of function template specialization 'std::sort<diagonal<int>::diagonal_iter>' requested here
                std::sort(d.begin(), d.end());
                     ^
    matrix-sort.cpp:17:19: note: copy assignment operator of 'diagonal_iter' is implicitly deleted because field 'm' is of reference type 'diagonal<int>::matrix_t &' (aka 'vector<std::vector<int>> &')
            matrix_t& m;
                      ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1830:2: error: no matching function for call to '__unguarded_linear_insert' [clang-diagnostic-error]
            std::__unguarded_linear_insert(__i,
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1850:9: note: in instantiation of function template specialization 'std::__unguarded_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
              std::__unguarded_insertion_sort(__first + int(_S_threshold), __last,
                   ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1940:9: note: in instantiation of function template specialization 'std::__final_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
              std::__final_insertion_sort(__first, __last, __comp);
                   ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization 'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
          std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());
               ^
    matrix-sort.cpp:161:18: note: in instantiation of function template specialization 'std::sort<diagonal<int>::diagonal_iter>' requested here
                std::sort(d.begin(), d.end());
                     ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1782:5: note: candidate template ignored: substitution failure [with _RandomAccessIterator = diagonal<int>::diagonal_iter, _Compare = __gnu_cxx::__ops::_Val_less_iter]
        __unguarded_linear_insert(_RandomAccessIterator __last,
        ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1923:11: error: object of type 'diagonal<int>::diagonal_iter' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]
              __last = __cut;
                     ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1937:9: note: in instantiation of function template specialization 'std::__introsort_loop<diagonal<int>::diagonal_iter, long, __gnu_cxx::__ops::_Iter_less_iter>' requested here
              std::__introsort_loop(__first, __last,
                   ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization 'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
          std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());
               ^
    matrix-sort.cpp:161:18: note: in instantiation of function template specialization 'std::sort<diagonal<int>::diagonal_iter>' requested here
                std::sort(d.begin(), d.end());
                     ^
    matrix-sort.cpp:17:19: note: copy assignment operator of 'diagonal_iter' is implicitly deleted because field 'm' is of reference type 'diagonal<int>::matrix_t &' (aka 'vector<std::vector<int>> &')
            matrix_t& m;
                      ^
    \n

    That's a lot of noise, isn't it? Let's focus on the important parts:

    \n
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1792:11: error: object of type 'diagonal<int>::diagonal_iter' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]
    …
    matrix-sort.cpp:17:19: note: copy assignment operator of 'diagonal_iter' is implicitly deleted because field 'm' is of reference type 'diagonal<int>::matrix_t &' (aka 'vector<std::vector<int>> &')
            matrix_t& m;
                      ^
    \n

    Ah! We have a reference in our iterator, and this prevents us from having a copy\nassignment operator (that is used “somewhere” in the sorting algorithm). Well…\nLet's just wrap it!

    \n
    # we need to keep a different type than reference
    -        matrix_t& m;
    +        std::reference_wrapper<matrix_t> m;

    # in comparison we need to get the reference out of the wrapper first
    -            return x == rhs.x && y == rhs.y && m == rhs.m;
    +            return x == rhs.x && y == rhs.y && m.get() == rhs.m.get();

    # same when we return a reference to the “cell” in the matrix
    -        reference operator*() const { return m[y][x]; }
    +        reference operator*() const { return m.get()[y][x]; }

    # and finally in the assertions that we set for the “distance” and “less than”
    -            assert(m == rhs.m);
    +            assert(m.get() == rhs.m.get());
    \n

    We're done now! We have written an iterator over diagonals for a 2D vector. You can have a look at the final result here.

    \n

    Footnotes​

    \n
      \n
    1. \n

      just because I'm used to it and don't care about your opinion ;) ↩

      \n
      2. \n
    2. \n

      exercise at your own risk ↩

      \n
      3. \n
    3. \n

      me in 5 minutes in fact, but don't make me scared ↩

      \n
      4. \n
    4. \n

      me in the next section… ↩

      \n
      5. \n
    \n
    ", + "content_html": "

    Let's try to solve one of the LeetCode challenges in easy and hard mode at the\nsame time.

    \n\n

    Problem description​

    \n

    A matrix diagonal is a diagonal line of cells starting from some cell in\neither the topmost row or leftmost column and going in the bottom-right direction\nuntil reaching the matrix's end. For example, the matrix diagonal starting\nfrom mat[2][0], where mat is a 6 x 3 matrix, includes cells mat[2][0],\nmat[3][1], and mat[4][2].

    \n

    Given an m x n matrix mat of integers, sort each matrix diagonal in ascending\norder and return the resulting matrix.

    \n

    Example​

    \n

    \"Image

    \n

    Skeleton and initial adjustments​

    \n

    We are given the following skeleton for the C++ and the given challenge:

    \n
    class Solution {
    public:
        vector<vector<int>> diagonalSort(vector<vector<int>>& mat) {

        }
    };
    \n

    The task is to sort the passed matrix diagonally and then return it. First of all,\nI don't like to solve this in a web browser, so we'll need to adjust it accordingly\nfor running it locally. We'll start by including the vector header and using\nfully-qualified namespaces1 and also adding few tests:

    \n
    #include <cassert>
    #include <vector>

    using matrix = std::vector<std::vector<int>>;

    class Solution {
    public:
        matrix diagonalSort(matrix& mat)
        {
        }
    };

    static void test_case_1()
    {
        // Input: mat = [[3,3,1,1],[2,2,1,2],[1,1,1,2]]
        // Output: [[1,1,1,1],[1,2,2,2],[1,2,3,3]]

        Solution s;
        assert((s.diagonalSort(std::vector { std::vector { 3, 3, 1, 1 },
                    std::vector { 2, 2, 1, 2 },
                    std::vector { 1, 1, 1, 2 } })
            == std::vector { std::vector { 1, 1, 1, 1 },
                std::vector { 1, 2, 2, 2 },
                std::vector { 1, 2, 3, 3 } }));
    }

    static void test_case_2()
    {
        // Input: mat =
        // [[11,25,66,1,69,7],[23,55,17,45,15,52],[75,31,36,44,58,8],[22,27,33,25,68,4],[84,28,14,11,5,50]]
        // Output:
        // [[5,17,4,1,52,7],[11,11,25,45,8,69],[14,23,25,44,58,15],[22,27,31,36,50,66],[84,28,75,33,55,68]]

        Solution s;
        assert((s.diagonalSort(std::vector { std::vector { 11, 25, 66, 1, 69, 7 },
                    std::vector { 23, 55, 17, 45, 15, 52 },
                    std::vector { 75, 31, 36, 44, 58, 8 },
                    std::vector { 22, 27, 33, 25, 68, 4 },
                    std::vector { 84, 28, 14, 11, 5, 50 } })
            == std::vector { std::vector { 5, 17, 4, 1, 52, 7 },
                std::vector { 11, 11, 25, 45, 8, 69 },
                std::vector { 14, 23, 25, 44, 58, 15 },
                std::vector { 22, 27, 31, 36, 50, 66 },
                std::vector { 84, 28, 75, 33, 55, 68 } }));
    }

    int main()
    {
        test_case_1();
        test_case_2();

        return 0;
    }
    \n

    We need to return the matrix, but we're given a reference to the input matrix. We\ncan easily abuse the C++ here and just switch the reference to value, this way\nthe matrix will be copied when passed to the function, we can sort the copy and\njust return it back. And we also get yelled by the compiler for the fact that the\nmethod doesn't return anything yet, so to make it “shut up” we will just return\nthe input for now:

    \n
    -    matrix diagonalSort(matrix& mat)
    +    matrix diagonalSort(matrix mat)
         {
    +        return mat;
         }
    \n

    Now, we get the copy and we're good to go.

    \n

    Naïve solution​

    \n

    As you may know, C++ offers a plethora of functions that can be used to your\nadvantage, given that you know how to “bend” the data structures accordingly.

    \n

    What does that mean for us? Well, we have an std::sort, we can use it, right?\nLet's have a look at it:

    \n
    template< class RandomIt >
    void sort( RandomIt first, RandomIt last );
    \n

    This overload is more than we need. What does it do? It just sorts the elements\nin the range [first, last) using operator< on them. We can't sort the whole\nmatrix using this, but… we can sort just »one« diagonal without doing much work\non our end.

    \n

    What is the RandomIt type though? If we look more into the documentation, we\ncan easily find the requirements for it and also learn that it's a random access\niterator and allows swapping its values at the same time.

    \n
    Random access iterator

    What is the random access iterator though? We can find it in a documentation\nand see the following description:

    \n

    A LegacyRandomAccessIterator is a LegacyBidirectionalIterator\nthat can be moved to point to any element in constant time.

    \n

    After that we can see all the requirements for it being listed. I don't feel like\nreading them right now, so we will just use it and see where the compilation blows\nup, i.e. “compiler-assisted development”2 if you will ;)

    \n

    Now we know that we can use std::sort to sort the diagonal itself, but we also\nneed to get the diagonals somehow. I'm rather lazy, so I'll just delegate it to\nsomeone else3. And that way we get

    \n
    matrix diagonalSort(matrix mat)
    {
        // we iterate over the diagonals
        for (auto d : diagonals(mat)) {
            // and we sort each diagonal
            std::sort(d.begin(), d.end());
        }

        // we take the matrix by copy, so we can sort in-situ and return the copy
        // that we sorted
        return mat;
    }
    \n

    This solution looks very simple, doesn't it? Well, cause it is.\nLet's try compiling it:

    \n
    matrix-sort.cpp:11:23: error: use of undeclared identifier 'diagonals' [clang-diagnostic-error]
            for (auto d : diagonals(mat)) {
                          ^
    Found compiler error(s).
    make: *** [makefile:14: tidy] Error 1
    \n

    OK, seems about right. We haven't implemented the diagonals yet. And based on\nwhat we've written so far, we need a function or a class diagonals that will\ngive us the diagonals we need.

    \n

    Implementing the diagonals​

    \n

    Cool, so we need the function that will let us go through each and every diagonal\nin our matrix. We use the for-range loop, so whatever we get back from the\ndiagonals must support .begin() and .end(). Since I am a masochist, we will\ndo such functionality for a matrix of any type, not just the int from the challenge.

    \n

    As I said, we need to be able to

    \n
      \n
    • construct the object
      • \n
    • get the beginning
      • \n
    • get the end (the “sentinel”)
      • \n
    \n
    template <typename T>
    class diagonals {
        using matrix_t = std::vector<std::vector<T>>;

        matrix_t& _matrix;

    public:
        diagonals(matrix_t& m)
            : _matrix(m)
        {
        }
        diagonals_iter begin()
        {
            /* TODO */
        }
        diagonals_iter end()
        {
            /* TODO */
        }
    };
    \n

    Now we have a diagonals that we can use to go through the diagonals. We haven't\nimplemented the core of it yet. Let's go through what we have for now.

    \n

    We have a templated class with templated T that is used as a placeholder for any\ntype we would store in the matrix. Because I'm lazy, I have defined the matrix_t\ntype that is a “shortcut” for std::vector<std::vector<T>>, so I don't have to\ntype it out all the time. Of course, we need to store the matrix, we are given,\nas a private attribute. And then just have the constructor and the 2 methods we\nneed for the for-range.

    \n

    Iterating over diagonals​

    \n

    Now that we have an object that will allow us to iterate through the diagonals,\nwe need to implement the iterating itself. We need to go through all of them, so\nwe have multiple options how to do so. I have decided to start from the “main”\ndiagonal that starts at (0, 0) index and then proceed with the diagonals starting\nin the first row, followed by the rest of the diagonals in the first column.

    \n

    We need to be able to tell that we've iterated through all of them, and also we\nneed to know which diagonal is next. For that purpose we will pass the indices\nof the first cell on the diagonal. That way we can always tell how to move forward.

    \n

    We will start by updating the begin and end to reflect our choice accordingly.

    \n
    diagonals_iter begin() { return diagonals_iter { _matrix, 0, 0 }; }
    diagonals_iter end() { return diagonals_iter { _matrix, 0, _matrix.size() }; }
    \n

    For the begin we return the first diagonal that starts at (0, 0). And because\nwe have decided to do the diagonals in the first column at the end, the first\ndiagonal that is not a valid one is the one at (0, height). Apart from the\nindices, we also need to pass reference to the matrix itself.

    \n
    note

    You may have noticed that we also include the diagonals that have length 1,\nspecifically the ones at (0, height - 1) and (width - 1, 0). We are implementing\nan iterator that should not care about the way it's being used. Therefore, we\ndon't care about the fact they don't need to be sorted.

    \n

    Cool, let's leave the iterator itself to someone else, right?4

    \n

    Implementing the iterator over diagonals​

    \n

    We can start with a simple skeleton based on the information that we pass from\nthe diagonals. Also to utilize the matrix_t and also contain implementation\ndetails hidden away, we will put this code into the diagonals class.

    \n
    class diagonals_iter {
        matrix_t& m;
        std::size_t x;
        std::size_t y;

    public:
        diagonals_iter(matrix_t& matrix, std::size_t x, std::size_t y)
            : m(matrix)
            , x(x)
            , y(y)
        {
        }
    };
    \n

    In this case we will be implementing a “simple” forward iterator, so we don't\nneed to implement a lot. Notably it will be:

    \n
      \n
    • inequality operator (we need to know when we reach the end and have nothing to\niterate over)
      • \n
    • preincrementation operator (we need to be able to move around the iterable)
      • \n
    • dereference operator (we need to be able to retrieve the objects we iterate\nover)
      • \n
    \n
    class diagonals_iter {
        matrix_t& m;
        std::size_t x;
        std::size_t y;

    public:
        diagonals_iter(matrix_t& matrix, std::size_t x, std::size_t y)
            : m(matrix)
            , x(x)
            , y(y)
        {
        }

        bool operator!=(const diagonals_iter& rhs) const
        {
            // iterators are not equal if they reference different matrices, or
            // their positions differ
            return m != rhs.m || x != rhs.x || y != rhs.y;
        }

        diagonals_iter& operator++()
        {
            if (y != 0) {
                // iterating through diagonals down the first column
                y++;
                return *this;
            }

            // iterating the diagonals along the first row
            x++;
            if (x == m.front().size()) {
                // switching to diagonals in the first column
                x = 0;
                y++;
            }

            return *this;
        }

        diagonal<T> operator*() const { return diagonal { m, x, y }; }
    };
    \n

    Let's go one-by-one. Inequality operator is rather simple, just compare iterator's\nattributes field-by-field. If you think about it, checking inequality of two 2D\nvectors may be a bit inefficient, therefore, we can swap around and check it as\na last thing.

    \n
    -        return m != rhs.m || x != rhs.x || y != rhs.y;
    +        return x != rhs.x || y != rhs.y || m != rhs.m;
    \n

    Preincrementation is where the magic happens. If you have a better look, you can\nsee two branches of this operation:

    \n
      \n
    1. When y != 0 (we're iterating over the diagonals in the first column)\nIn this case, we just bump the row and we're done.
      2. \n
    2. When y == 0 (we're iterating over the diagonals in the first row)\nIn this case, we bump the column and check if we haven't gotten out of bounds,\ni.e. the end of the first row. If we get out of the bounds, we're continuing\nwith the second diagonal in the first column.
      3. \n
    \n

    Dereferencing the iterator must “yield” something. In our case it will be the\ndiagonal that we want to sort. For sorting we need just the iterators that can\nmove around said diagonal. The simplest thing, we can do, is to delegate it to\nsomething else. In our case it will be a class called diagonal.

    \n

    Implementing the diagonal itself​

    \n

    After implementing the iterator over diagonals, we know that all we need to describe\na diagonal is the matrix itself and the “start” of the diagonal (row and column).\nAnd we also know that the diagonal must provide some iterators for the std::sort\nfunction. We can start with the following skeleton:

    \n
    template <typename T>
    class diagonal {
        using matrix_t = std::vector<std::vector<T>>;

        matrix_t& matrix;
        std::size_t x;
        std::size_t y;

    public:
        diagonal(matrix_t& matrix, std::size_t x, std::size_t y)
            : matrix(matrix)
            , x(x)
            , y(y)
        {
        }

        diagonal_iter begin() const { return diagonal_iter { matrix, x, y }; }

        diagonal_iter end() const
        {
            auto max_x = matrix[y].size();
            auto max_y = matrix.size();

            // we need to find the distance in which we get out of bounds (either in
            // column or row)
            auto steps = std::min(max_x - x, max_y - y);

            return diagonal_iter { matrix, x + steps, y + steps };
        }
    };
    \n

    Initialization is rather simple, we just “keep” the stuff we get, begin is the\nsimplest, we just delegate.

    \n

    In case of the end, it gets more complicated. We need to know where is the “end”\nof the diagonal. Since end should point to the first element “after” the iterable,\nwe know that it's the first position of the iterator where either y becomes\nmatrix.size() or x becomes matrix[y].size(). Also we are moving along diagonal,\nduh, therefore we can deduce the first “position” afterwards by minimal amount of\nsteps to get out of the any column or row, hence std::min(max_x - x, max_y - y).\nFinal position is then computed simply by adding the steps to the beginning of\nthe diagonal.

    \n

    Now we just need to finish the iterator for the diagonal itself and we're done.

    \n

    Implementing diagonal_iter​

    \n

    This part is the hardest from all we need to do. It's because of the requirements\nof the std::sort that requires us to implement a random access iterator. I have\nbriefly described it above, and “in a nutshell” it means that we need to implement\nan iterator that can move in constant time along the diagonal in any amount of\nsteps.

    \n

    Let's go through all of the functionality that our iterator needs to support to\nbe used in std::sort. We need the usual operations like:

    \n
      \n
    • equality/inequality
      • \n
    • incrementation
      • \n
    • dereferencing
      • \n
    \n

    We will also add all the types that our iterator uses with the category of the\niterator, i.e. what interface it supports:

    \n
    class diagonal_iter {
        // we need to keep reference to the matrix itself
        matrix_t& m;

        // we need to be able to tell our current position
        std::size_t x;
        std::size_t y;

    public:
        using difference_type = std::ptrdiff_t;
        using value_type = T;
        using pointer = T*;
        using reference = T&;
        using iterator_category = std::random_access_iterator_tag;

        diagonal_iter(matrix_t& matrix,
            std::size_t x,
            std::size_t y)
            : m(matrix)
            , x(x)
            , y(y)
        {
        }

        bool operator==(const diagonal_iter& rhs) const
        {
            return x == rhs.x && y == rhs.y && m == rhs.m;
        }

        diagonal_iter& operator++()
        {
            // we are moving along the diagonal, so we increment both ‹x› and ‹y› at
            // the same time
            x++;
            y++;
            return *this;
        }

        reference operator*() const { return m[y][x]; }
    };
    \n

    This is pretty similar to the previous iterator, but now we need to implement the\nremaining requirements of the random access iterator. Let's see what those are:

    \n
      \n
    • decrementation - cause we need to be able to move backwards too, since _random _\naccess iterator extends the interface of bidirectional iterator
      • \n
    • moving the iterator in either direction by steps given as an integer
      • \n
    • being able to tell the distance between two iterators
      • \n
    • define an ordering on the iterators
      • \n
    \n

    Let's fill them in:

    \n
    class diagonal_iter {
        // we need to keep reference to the matrix itself
        matrix_t& m;

        // we need to be able to tell our current position
        std::size_t x;
        std::size_t y;

    public:
        using difference_type = std::ptrdiff_t;
        using value_type = T;
        using pointer = T*;
        using reference = T&;
        using iterator_category = std::random_access_iterator_tag;

        diagonal_iter(matrix_t& matrix,
            std::size_t x,
            std::size_t y)
            : m(matrix)
            , x(x)
            , y(y)
        {
        }

        bool operator==(const diagonal_iter& rhs) const
        {
            return x == rhs.x && y == rhs.y && m == rhs.m;
        }

        diagonal_iter& operator++()
        {
            // we are moving along the diagonal, so we increment both ‹x› and ‹y› at
            // the same time
            x++;
            y++;
            return *this;
        }

        reference operator*() const { return m[y][x]; }

        // exactly opposite to the incrementation
        diagonal_iter operator--()
        {
            x--;
            y--;
            return *this;
        }

        // moving ‹n› steps back is same as calling decrementation ‹n›-times, so we
        // can just return a new iterator and subtract ‹n› from both coordinates in
        // the matrix
        diagonal_iter operator-(difference_type n) const
        {
            return diagonal_iter { m, x - n, y - n };
        }

        // here we assume that we are given two iterators on the same diagonal
        difference_type operator-(const diagonal_iter& rhs) const
        {
            assert(m == rhs.m);
            return x - rhs.x;
        }

        // counterpart of moving ‹n› steps backwards
        diagonal_iter operator+(difference_type n) const
        {
            return diagonal_iter { m, x + n, y + n };
        }

        // we compare the coordinates, and also assume that those 2 iterators are
        // lying on the same diagonal
        bool operator<(const diagonal_iter& rhs) const
        {
            assert(m == rhs.m);
            return x < rhs.x && y < rhs.y;
        }
    };
    \n

    At this point we could probably try and compile it, right? If we do so, we will\nget yelled at by a compiler for the following reasons:

    \n
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1792:11: error: object of type 'diagonal<int>::diagonal_iter' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]
              __last = __next;
                     ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1817:11: note: in instantiation of function template specialization 'std::__unguarded_linear_insert<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Val_less_iter>' requested here
                std::__unguarded_linear_insert(__i,
                     ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1849:9: note: in instantiation of function template specialization 'std::__insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
              std::__insertion_sort(__first, __first + int(_S_threshold), __comp);
                   ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1940:9: note: in instantiation of function template specialization 'std::__final_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
              std::__final_insertion_sort(__first, __last, __comp);
                   ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization 'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
          std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());
               ^
    matrix-sort.cpp:161:18: note: in instantiation of function template specialization 'std::sort<diagonal<int>::diagonal_iter>' requested here
                std::sort(d.begin(), d.end());
                     ^
    matrix-sort.cpp:17:19: note: copy assignment operator of 'diagonal_iter' is implicitly deleted because field 'm' is of reference type 'diagonal<int>::matrix_t &' (aka 'vector<std::vector<int>> &')
            matrix_t& m;
                      ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1830:2: error: no matching function for call to '__unguarded_linear_insert' [clang-diagnostic-error]
            std::__unguarded_linear_insert(__i,
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1850:9: note: in instantiation of function template specialization 'std::__unguarded_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
              std::__unguarded_insertion_sort(__first + int(_S_threshold), __last,
                   ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1940:9: note: in instantiation of function template specialization 'std::__final_insertion_sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
              std::__final_insertion_sort(__first, __last, __comp);
                   ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization 'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
          std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());
               ^
    matrix-sort.cpp:161:18: note: in instantiation of function template specialization 'std::sort<diagonal<int>::diagonal_iter>' requested here
                std::sort(d.begin(), d.end());
                     ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1782:5: note: candidate template ignored: substitution failure [with _RandomAccessIterator = diagonal<int>::diagonal_iter, _Compare = __gnu_cxx::__ops::_Val_less_iter]
        __unguarded_linear_insert(_RandomAccessIterator __last,
        ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1923:11: error: object of type 'diagonal<int>::diagonal_iter' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]
              __last = __cut;
                     ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1937:9: note: in instantiation of function template specialization 'std::__introsort_loop<diagonal<int>::diagonal_iter, long, __gnu_cxx::__ops::_Iter_less_iter>' requested here
              std::__introsort_loop(__first, __last,
                   ^
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:4820:12: note: in instantiation of function template specialization 'std::__sort<diagonal<int>::diagonal_iter, __gnu_cxx::__ops::_Iter_less_iter>' requested here
          std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());
               ^
    matrix-sort.cpp:161:18: note: in instantiation of function template specialization 'std::sort<diagonal<int>::diagonal_iter>' requested here
                std::sort(d.begin(), d.end());
                     ^
    matrix-sort.cpp:17:19: note: copy assignment operator of 'diagonal_iter' is implicitly deleted because field 'm' is of reference type 'diagonal<int>::matrix_t &' (aka 'vector<std::vector<int>> &')
            matrix_t& m;
                      ^
    \n

    That's a lot of noise, isn't it? Let's focus on the important parts:

    \n
    /usr/bin/../lib/gcc/x86_64-redhat-linux/12/../../../../include/c++/12/bits/stl_algo.h:1792:11: error: object of type 'diagonal<int>::diagonal_iter' cannot be assigned because its copy assignment operator is implicitly deleted [clang-diagnostic-error]
    …
    matrix-sort.cpp:17:19: note: copy assignment operator of 'diagonal_iter' is implicitly deleted because field 'm' is of reference type 'diagonal<int>::matrix_t &' (aka 'vector<std::vector<int>> &')
            matrix_t& m;
                      ^
    \n

    Ah! We have a reference in our iterator, and this prevents us from having a copy\nassignment operator (that is used “somewhere” in the sorting algorithm). Well…\nLet's just wrap it!

    \n
    # we need to keep a different type than reference
    -        matrix_t& m;
    +        std::reference_wrapper<matrix_t> m;

    # in comparison we need to get the reference out of the wrapper first
    -            return x == rhs.x && y == rhs.y && m == rhs.m;
    +            return x == rhs.x && y == rhs.y && m.get() == rhs.m.get();

    # same when we return a reference to the “cell” in the matrix
    -        reference operator*() const { return m[y][x]; }
    +        reference operator*() const { return m.get()[y][x]; }

    # and finally in the assertions that we set for the “distance” and “less than”
    -            assert(m == rhs.m);
    +            assert(m.get() == rhs.m.get());
    \n

    We're done now! We have written an iterator over diagonals for a 2D vector. You can have a look at the final result here.

    \n

    Footnotes​

    \n
      \n
    1. \n

      just because I'm used to it and don't care about your opinion ;) ↩

      \n
      2. \n
    2. \n

      exercise at your own risk ↩

      \n
      3. \n
    3. \n

      me in 5 minutes in fact, but don't make me scared ↩

      \n
      4. \n
    4. \n

      me in the next section… ↩

      \n
      5. \n
    \n
    ", "url": "https://blog.mfocko.xyz/blog/leetcode/sort-diagonally", "title": "Sort the matrix diagonally", "summary": "Compiler assisted development.", diff --git a/blog/index.html b/blog/index.html index f35e90f..fb37fe7 100644 --- a/blog/index.html +++ b/blog/index.html @@ -2,7 +2,7 @@ - + Blog | mf @@ -14,11 +14,19 @@ - - + + -

    · 4 min read
    Matej Focko

    When you decide to run Fedora on your VPS, you might get screwed over by using +

    · 16 min read
    Matej Focko

    Rust has become a rather popular language these days. I've managed to get my +hands dirty with it during [Advent of Code] ‘22 and partially ‘23. I've also +used it for few rounds of [Codeforces] and I have to try very hard to maintain +some variety of languages for LeetCode challenges along with the Rust. I'll +disclaim up front that I won't be only positive, since this post is a result of +multiple discussions about Rust and I stand behind +“All that glitters is not gold”, so if you can't stand your favorite language +being criticized in any way, don't even proceed. 😉

    diff --git a/blog/leetcode/sort-diagonally/index.html b/blog/leetcode/sort-diagonally/index.html index 2408a8b..0b932ad 100644 --- a/blog/leetcode/sort-diagonally/index.html +++ b/blog/leetcode/sort-diagonally/index.html @@ -2,7 +2,7 @@ - + Sort the matrix diagonally | mf @@ -14,11 +14,11 @@ - - + + -

    Sort the matrix diagonally

    · 17 min read
    Matej Focko

    Let's try to solve one of the LeetCode challenges in easy and hard mode at the +

    Sort the matrix diagonally

    · 17 min read
    Matej Focko

    Let's try to solve one of the LeetCode challenges in easy and hard mode at the same time.

Submitting​

In case you have any questions, feel free to reach out to me.

-
+
\ No newline at end of file diff --git a/c/bonuses/seminar-10/index.html b/c/bonuses/seminar-10/index.html index 370e1fe..891cc5b 100644 --- a/c/bonuses/seminar-10/index.html +++ b/c/bonuses/seminar-10/index.html @@ -2,7 +2,7 @@ - + 10th seminar | mf @@ -16,8 +16,8 @@ - - + +

10th seminar

Source

@@ -78,7 +78,7 @@ will drag the common files myself. :)

As we have talked about on the seminar, I suggest you to follow Test-Driven Development in this case.

-

TDD workflow

+

TDD workflow

In our current scenario we are already in the stage of refactoring and fixing the bugs. Therefore try to follow this succession of steps:

    @@ -136,6 +136,6 @@ it is a not requirement at all and you can still get all points for the bonus ;)

    Submitting​

    In case you have any questions, feel free to reach out to me.

    -
+
\ No newline at end of file diff --git a/c/category/bonuses/index.html b/c/category/bonuses/index.html index 1bf70ef..68ca881 100644 --- a/c/category/bonuses/index.html +++ b/c/category/bonuses/index.html @@ -2,7 +2,7 @@ - + Bonuses | mf @@ -16,8 +16,8 @@ - - + +

Bonuses

Bonus assignments for Kontr Coins. diff --git a/c/category/practice-exams/index.html b/c/category/practice-exams/index.html index 6517d80..be967af 100644 --- a/c/category/practice-exams/index.html +++ b/c/category/practice-exams/index.html @@ -2,7 +2,7 @@ - + Practice Exams | mf @@ -16,8 +16,8 @@ - - + +

Practice Exams

Practice exams for training for the final exam. diff --git a/c/index.html b/c/index.html index daa9c0c..a0129e9 100644 --- a/c/index.html +++ b/c/index.html @@ -2,7 +2,7 @@ - + Introduction | mf @@ -14,10 +14,10 @@ - - + + -

+
\ No newline at end of file diff --git a/c/mr/index.html b/c/mr/index.html index d014877..33af1ee 100644 --- a/c/mr/index.html +++ b/c/mr/index.html @@ -2,7 +2,7 @@ - + Submitting merge requests | mf @@ -14,8 +14,8 @@ - - + +

Submitting merge requests for review

@@ -87,6 +87,6 @@ For the sake of safety, do not continue without clean repository. Then with comm be main or trunk.

aisa$ git status
# Check if repository is clean

# If you know, what is your default branch, you can skip next command.
aisa$ git branch
# Find the default branch in the list; should be one of the `master`, `main` or
# `trunk` and you should not have more than one of those.
# In case the list clears the terminal and you cannot see shell prompt, you can
# press `q` to quit the pager.

aisa$ git checkout master
-

Adapted from: https://www.fi.muni.cz/~xlacko1/pb071/mr.html

+

Adapted from: https://www.fi.muni.cz/~xlacko1/pb071/mr.html

\ No newline at end of file diff --git a/c/pexam/cams/index.html b/c/pexam/cams/index.html index dd80c96..4365cab 100644 --- a/c/pexam/cams/index.html +++ b/c/pexam/cams/index.html @@ -2,7 +2,7 @@ - + Practice exam C | mf @@ -16,8 +16,8 @@ - - + +

Watching Cams

diff --git a/c/pexam/garbage_collect/index.html b/c/pexam/garbage_collect/index.html index 647878d..0e37848 100644 --- a/c/pexam/garbage_collect/index.html +++ b/c/pexam/garbage_collect/index.html @@ -2,7 +2,7 @@ - + Practice exam B | mf @@ -16,8 +16,8 @@ - - + +

Garbage Collection

diff --git a/contributions/index.html b/contributions/index.html index 3d3cfb9..6d63ddc 100644 --- a/contributions/index.html +++ b/contributions/index.html @@ -2,7 +2,7 @@ - + Contributions | mf @@ -14,10 +14,10 @@ - - + + -

Contributions

Many of my contributions to open-source projects.

tmt

Description

The `tmt` tool provides a user-friendly way to work with tests. You can comfortably create new tests, safely and easily run tests across different environments, review test results, debug test code and enable tests in the CI using a consistent and concise config.

Contribution

Just a smallish contribution to the docs related to the changes implemented on the Packit side.

See repository

Fedora Infrastructure Ansible

Description

Collection of Ansible playbooks that powers the Fedora Infrastructure.

Contribution

I have adjusted the groups in the Bodhi playbooks after Packit has been granted the privileges to propose updates without restrictions.

See repository

Bodhi

Description

Bodhi is a web-system that facilitates the process of publishing updates for a Fedora-based software distribution.

Contribution

I have adjusted the client, so that it doesn't show secrets in terminal when you log in to the Bodhi via browser.

See repository

Gluetool Modules Collection

Description

Modules for gluetool — a command line centric framework usable for glueing modules into a pipeline.

Contribution
  • I have proposed a possible implementation of git merging that was later on extended.
  • I have tried to help out with Copr module after they deprecated older version of their API.
See repository

Pagure

Description

Pagure is a git-centered forge, python based using pygit2.

Contribution

I have added an API endpoint for reopening pull requests.

See repository

Copr

Description

RPM build system - upstream for Copr.

Contribution
  • Supporting external repositories for custom SRPM build method.
  • Allowing admins of Copr repositories to build without the need to ask for explicit builder permissions.
See repository

python-gitlab

Description

A python wrapper for the GitLab API.

Contribution

I have contributed support for the merge_ref on merge requests that hasn't been supported, yet it was present in the GitLab API.

See repository

PatternFly React

Description

A set of React components for the PatternFly project.

Contribution

When working on Packit Dashboard, I have spotted smaller bugs that were present in this project and fixed them upstream to provide better experience for our users.

See repository

Fira Code

Description

Free monospaced font with programming ligatures.

Contribution

I have set up a GitHub Action for building the font on each push to the default branch allowing users to install bleeding edge version of the font.

See repository

nixpkgs

Description

Nixpkgs is a collection of over 80,000 software packages that can be installed with the Nix package manager. It also implements NixOS, a purely-functional Linux distribution.

Contribution

When I was trying out the nixpkgs, I have tried to bump .NET Core to the latest version. My changes haven't been accepted as they required bumping of multiple more packages that depended upon the .NET Core.

See repository

Darcula

Description

A theme for Visual Studio Code based on Darcula theme from Jetbrains IDEs.

Contribution

I have contributed support for diff files, though the project doesn't seem to be live anymore, so it hasn't been accepted as of now.

See repository

Packit

Description

An open source project aiming to ease the integration of your project with Fedora Linux, CentOS Stream and other distributions.

Contribution

Have a look at my pull requests.

See repository

Snitch

Description

Language agnostic tool that collects TODOs in the source code and reports them as Issues.

Contribution
  • Environment variable support for self-hosted GitLab instances
  • GitLab support
See repository

Karel the Robot

Description

Karel the robot is in general an educational programming language for beginners, created by Richard E. Pattis. This is implementation of Karel the Robot for C programming language.

This project is used for educational purposes at TUKE.

Contribution

I have contributed some refactoring tips to the author of the library.

See repository
+

Contributions

Many of my contributions to open-source projects.

tmt

Description

The tmt tool provides a user-friendly way to work with tests. You can comfortably create new tests, safely and easily run tests across different environments, review test results, debug test code and enable tests in the CI using a consistent and concise config.

Contribution

Just a smallish contribution to the docs related to the changes implemented on the Packit side.

See repository

Fedora Infrastructure Ansible

Description

Collection of Ansible playbooks that powers the Fedora Infrastructure.

Contribution

I have adjusted the groups in the Bodhi playbooks after Packit has been granted the privileges to propose updates without restrictions.

See repository

Bodhi

Description

Bodhi is a web-system that facilitates the process of publishing updates for a Fedora-based software distribution.

Contribution

I have adjusted the client, so that it doesn't show secrets in terminal when you log in to the Bodhi via browser.

See repository

Gluetool Modules Collection

Description

Modules for gluetool — a command line centric framework usable for glueing modules into a pipeline.

Contribution
  • I have proposed a possible implementation of git merging that was later on extended.
  • I have tried to help out with Copr module after they deprecated older version of their API.
See repository

Pagure

Description

Pagure is a git-centered forge, python based using pygit2.

Contribution

I have added an API endpoint for reopening pull requests.

See repository

Copr

Description

RPM build system - upstream for Copr.

Contribution
  • Supporting external repositories for custom SRPM build method.
  • Allowing admins of Copr repositories to build without the need to ask for explicit builder permissions.
See repository

python-gitlab

Description

A python wrapper for the GitLab API.

Contribution

I have contributed support for the merge_ref on merge requests that hasn't been supported, yet it was present in the GitLab API.

See repository

PatternFly React

Description

A set of React components for the PatternFly project.

Contribution

When working on Packit Dashboard, I have spotted smaller bugs that were present in this project and fixed them upstream to provide better experience for our users.

See repository

Fira Code

Description

Free monospaced font with programming ligatures.

Contribution

I have set up a GitHub Action for building the font on each push to the default branch allowing users to install bleeding edge version of the font.

See repository

nixpkgs

Description

Nixpkgs is a collection of over 80,000 software packages that can be installed with the Nix package manager. It also implements NixOS, a purely-functional Linux distribution.

Contribution

When I was trying out the nixpkgs, I have tried to bump .NET Core to the latest version. My changes haven't been accepted as they required bumping of multiple more packages that depended upon the .NET Core.

See repository

Darcula

Description

A theme for Visual Studio Code based on Darcula theme from Jetbrains IDEs.

Contribution

I have contributed support for diff files, though the project doesn't seem to be live anymore, so it hasn't been accepted as of now.

See repository

Packit

Description

An open source project aiming to ease the integration of your project with Fedora Linux, CentOS Stream and other distributions.

Contribution

Have a look at my pull requests.

See repository

Snitch

Description

Language agnostic tool that collects TODOs in the source code and reports them as Issues.

Contribution
  • Environment variable support for self-hosted GitLab instances
  • GitLab support
See repository

Karel the Robot

Description

Karel the robot is in general an educational programming language for beginners, created by Richard E. Pattis. This is implementation of Karel the Robot for C programming language.

This project is used for educational purposes at TUKE.

Contribution

I have contributed some refactoring tips to the author of the library.

See repository
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Exceptions and RAII

Materials related to the exceptions or RAII in C++. diff --git a/cpp/environment/index.html b/cpp/environment/index.html index 0213677..b051be9 100644 --- a/cpp/environment/index.html +++ b/cpp/environment/index.html @@ -2,7 +2,7 @@ - + Environment | mf @@ -16,8 +16,8 @@ - - + +

Environment

Required tools per OS​

diff --git a/cpp/exceptions-and-raii/placeholders/index.html b/cpp/exceptions-and-raii/placeholders/index.html index 4d612ad..5e2b813 100644 --- a/cpp/exceptions-and-raii/placeholders/index.html +++ b/cpp/exceptions-and-raii/placeholders/index.html @@ -2,7 +2,7 @@ - + Placeholders | mf @@ -16,8 +16,8 @@ - - + +

Placeholders

Here we will try to implement some placeholders that you can find in other diff --git a/cpp/index.html b/cpp/index.html index 498b1a7..02f843e 100644 --- a/cpp/index.html +++ b/cpp/index.html @@ -2,7 +2,7 @@ - + Introduction | mf @@ -14,10 +14,10 @@ - - + + -

+
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mf

blog and additional materials for courses at φ

About Me

I'm working in Red Hat in the Packit team and studying at FI MUNI while also tutoring some courses there.

Content

On this page you can find my blog or unofficial materials I have written over the course of teaching multiple courses at the FI.

Mastodon

Feel free to contact me on any of the following Mastodon accounts: Fosstodon or Hachyderm.io

diff --git a/search/index.html b/search/index.html index b421733..1385633 100644 --- a/search/index.html +++ b/search/index.html @@ -2,7 +2,7 @@ - + Search the documentation | mf @@ -14,8 +14,8 @@ - - + +

Search the documentation

diff --git a/sitemap.xml b/sitemap.xml index a74e3be..29b40a6 100644 --- a/sitemap.xml +++ b/sitemap.xml @@ -1 +1 @@ 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Talks

Featured talks I presented on various events.

Shift Left Testing with Packit and Testing Farm

In today's fast-paced software development landscape, ensuring the quality and reliability of upstream contributions is crucial. The traditional approach of testing at the end of the development cycle is no longer sufficient. To address this challenge, we present "Shift Left Your Testing with Packit and Testing Farm", a talk that introduces two powerful tools designed to simplify and enhance the testing process for the upstream contributions.

Packit and Testing Farm provide a dead simple way to build and test your upstream contributions against both public or internal Red Hat testing infrastructure. In this talk, we will explore the capabilities of both tools and demonstrate how they can be seamlessly integrated into your development workflow.

In addition to the current capabilities, we will share our plans for Packit and Testing.

  • QEcamp23
  • virtual
  • 11/2023

Packit: RPM integration, all in one

Do you want to automate how you build and test your RPM packages? Do you maintain any package in Fedora and want to automate the releases? Or are you just interested in CI/CD on GitHub or GitLab, Fedora and integration of upstream projects with RPM-based Linux distributions? In this session, we are going to deep-dive into features of Packit that can help you do your day-to-day job.
  • DevConf.cz
  • Brno, Czechia
  • 6/2023

Also presented on:

  • DevConf.cz Mini in Brno, Czechia (3/2023)
Watch recordingSee slides

Credits to Paweł Kosiec for implementing his own React components for talks.