mirror of
https://github.com/mfocko/blog.git
synced 2024-12-22 11:51:28 +01:00
blog(aoc-2022): fix typos
Signed-off-by: Matej Focko <me@mfocko.xyz>
This commit is contained in:
parent
5e93a6bf94
commit
933dcc83ac
2 changed files with 12 additions and 12 deletions
|
@ -227,7 +227,7 @@ It may seem as a very weird decision, but in fact it makes some sense… It allo
|
|||
you to do intersection of items that may not be possible to copy. Overall this is
|
||||
a „tax“ for having a borrow checker ~~drilling your ass~~ having your back and
|
||||
making sure you're not doing something naughty that may cause an **undefined**
|
||||
**behaviour**.
|
||||
**behavior**.
|
||||
|
||||
:::
|
||||
|
||||
|
@ -328,7 +328,7 @@ A lot of different approaches, knowing that we are dealing with input consisting
|
|||
solely of ASCII letters, I bit the bullet and went with sliding window and
|
||||
constructing sets from that window, checking if the set is as big as the window.
|
||||
|
||||
One possible optimization could consist of keeping a bitvector (i.e. `usize`
|
||||
One possible optimization could consist of keeping a bit-vector (i.e. `usize`
|
||||
variable) of encountered characters and updating it as we go. However this has
|
||||
a different issue and that is removal of the characters from the left side of the
|
||||
window. We don't know if the same character is not included later on.
|
||||
|
@ -341,7 +341,7 @@ of 26 elements that keeps count for each lowercase letter.
|
|||
|
||||
:::info tl;dr
|
||||
|
||||
Let's simulate [`du`] to get some stats about our filesystem and then pinpoint
|
||||
Let's simulate [`du`] to get some stats about our file system and then pinpoint
|
||||
directories that take a lot of space and should be deleted.
|
||||
|
||||
:::
|
||||
|
@ -351,7 +351,7 @@ directories that take a lot of space and should be deleted.
|
|||
|
||||
### Solution
|
||||
|
||||
We need to „_build_“ a filesystem from the input that is given in a following form:
|
||||
We need to „_build_“ a file system from the input that is given in a following form:
|
||||
```
|
||||
$ cd /
|
||||
$ ls
|
||||
|
@ -401,7 +401,7 @@ Then I looked up some implementations of trees or linked lists and decided to tr
|
|||
`Box<T>` represents a dynamically allocated memory on heap. It is a single pointer,
|
||||
you can imagine this as `std::unique_ptr<T>` in C++.
|
||||
|
||||
`Rc<T>` represents a dynamically allocated mmemory on heap. On top of that it is
|
||||
`Rc<T>` represents a dynamically allocated memory on heap. On top of that it is
|
||||
_reference counted_ (that's what the `Rc` stands for). You can imagine this as
|
||||
`std::shared_ptr<T>` in C++.
|
||||
|
||||
|
@ -419,7 +419,7 @@ to have `Rc<RefCell<T>>`.
|
|||
|
||||
:::
|
||||
|
||||
So, how are we going to represent the filesystem then? We will use an enumeration,
|
||||
So, how are we going to represent the file system then? We will use an enumeration,
|
||||
hehe, which is an algebraic data type that can store some stuff in itself :weary:
|
||||
```rust
|
||||
type FileHandle = Rc<RefCell<AocFile>>;
|
||||
|
@ -443,7 +443,7 @@ Now to the fun part! `AocFile` value can be represented in two ways:
|
|||
contain map matching the name of the files (or directories) within to their
|
||||
respective file handles
|
||||
|
||||
I will omit the details about constructing this filesystem, cause there are a lot
|
||||
I will omit the details about constructing this file system, cause there are a lot
|
||||
of technicalities introduced by the nature of the input. However if you are
|
||||
interested, you can have a look at my solution.
|
||||
|
||||
|
@ -466,7 +466,7 @@ solution.
|
|||
One of the more exotic options would be precomputing the required information at
|
||||
the same time as parsing. That could be done by adding additional fields to the
|
||||
nodes which would allow storing such information and updating it as we construct
|
||||
the filesystem.
|
||||
the file system.
|
||||
|
||||
## Post Mortem
|
||||
|
||||
|
|
|
@ -93,7 +93,7 @@ them both to `usize` type that can be used later on for indexing.
|
|||
The type signature of the function is where the fun is at :wink: We are trying
|
||||
to convert unknown type to `usize`, so we must bound the `T` as a type that can
|
||||
be converted to `usize`, that's how we got `usize: TryFrom<T>` which basically
|
||||
says that `usize` must implement `TryFrom<T>` trait vand therefore allows us to
|
||||
says that `usize` must implement `TryFrom<T>` trait and therefore allows us to
|
||||
convert the indices to actual `usize` indices. Using `.unwrap()` also forces us
|
||||
to bound the error that can occur when converting `T` into `usize`, that's how
|
||||
we get `<usize as TryFrom<T>>::Error: Debug` which loosely means
|
||||
|
@ -107,7 +107,7 @@ And now we are left only with the first line of the definition.
|
|||
|
||||
:::note
|
||||
|
||||
Skilled Rustaceans might notice that this implemention is rather flaky and can
|
||||
Skilled Rustaceans might notice that this implementation is rather flaky and can
|
||||
break in multiple places at once. I'll get back to it…
|
||||
|
||||
:::
|
||||
|
@ -358,7 +358,7 @@ where
|
|||
```
|
||||
|
||||
This is all part of the `Solution` trait, which can implement methods while being
|
||||
dependant on what is provided by the implementing types. In this case, we just
|
||||
dependent on what is provided by the implementing types. In this case, we just
|
||||
need to bound the `Output` type to implement `Display` that is necessary for the
|
||||
`info!` and format string there.
|
||||
|
||||
|
@ -589,7 +589,7 @@ also rolling down the hill…
|
|||
|
||||
As I have said in the _tl;dr_, we are looking for the shortest path, but the start
|
||||
and goal differ for the part 1 and 2. So I have decided to refactor my solution
|
||||
to a BFS algorithm that takes neccessary parameters via functions:
|
||||
to a BFS algorithm that takes necessary parameters via functions:
|
||||
```rust
|
||||
fn bfs<F, G>(
|
||||
graph: &[Vec<char>], start: &Position, has_edge: F, is_target: G
|
||||
|
|
Loading…
Reference in a new issue