mirror of
https://github.com/mfocko/blog.git
synced 2024-11-24 14:01:55 +01:00
160 lines
4.4 KiB
Markdown
160 lines
4.4 KiB
Markdown
---
|
|
id: seminar-08
|
|
title: 8th seminar
|
|
description: |
|
|
Manipulating with files only char-by-char and a magic tree.
|
|
---
|
|
|
|
# 8th seminar bonus assignment
|
|
|
|
[Source](pathname:///files/c/bonuses/08.tar.gz)
|
|
|
|
## Introduction
|
|
|
|
In this bonus you can implement two tasks, one of them has a bonus part with generic
|
|
solution.
|
|
|
|
One is focused on counting ananas or in case of generic version any substring in
|
|
the file, but with a restriction on the function you use.
|
|
|
|
Other one has a more algorithmic spirit.
|
|
|
|
For this bonus you can get at maximum 2.5 K₡.
|
|
|
|
## Warning
|
|
|
|
**DO NOT COMMIT test data** to your own git repository, since the tests include
|
|
files that exceed 10MB by themselves. Even if they are on separate branch, they
|
|
take up the space.
|
|
|
|
## Testing
|
|
|
|
For testing you are provided with python script (requires `click` to be installed:
|
|
`pip3 install --user click`) and `Makefile` that provides following targets:
|
|
|
|
- `check-counting` - runs the `counting` tests
|
|
- `check-counting-bonus` - runs the `counting` tests with bonus implemented
|
|
- `check` - runs both `counting` and `counting-bonus` tests
|
|
- `clean` - removes output files from the test runs
|
|
|
|
## Task no. 1: Counting (0.75 K₡)
|
|
|
|
Your first task is to make smallish program that counts occurences of specific
|
|
(or given) word from file and writes the number to other file.
|
|
|
|
Usage of the program is:
|
|
|
|
```
|
|
Usage: ./counting <input-file> <output-file> [string-to-be-counted]
|
|
```
|
|
|
|
Arguments that are passed to the program represent:
|
|
|
|
- `<input-file>` - path to the file where we count the words
|
|
- `<output-file>` - path to the file where we output the count
|
|
- (optional argument) `[string-to-be-counted]` - in case you implement bonus,
|
|
otherwise we default to word `ananas` ;)
|
|
|
|
In skeleton you are given 3 empty, but documented, functions to implement.
|
|
|
|
1. `count_anything` - function accepts input file and substring to be counted in
|
|
the file, returns the count.
|
|
2. `count_ananas` - same as `count_anything`, but specialized for ananases, the
|
|
default implementation from the skeleton expects you to implement `count_anything`
|
|
and therefore it just calls the other function.
|
|
3. `write_number` - function that writes the number to the file, why would you
|
|
need the function is explained later :)
|
|
|
|
### Requirements
|
|
|
|
For manipulation with the files you are only allowed to use `fopen`, `fclose`,
|
|
`fgetc` and `fputc`. Functions like `fprintf` (except for `stderr` or logging) and
|
|
`fscanf` are **forbidden**.
|
|
|
|
In case you struggle and want to use one of those functions, the solution will be
|
|
penalized by 50% of points.
|
|
|
|
### Bonus part (0.75 K₡)
|
|
|
|
Bonus part of this assignment is to implement `count_anything` rather than `count_ananas`.
|
|
|
|
> Smaller hint: This task does not need dynamic allocation :) You just need one
|
|
> good helper function and the right idea ;)
|
|
|
|
## Task no. 2: Weird trees (1 K₡)
|
|
|
|
In this task we are crossing our paths with _algorithms and data structures_.
|
|
Your task is to write a program that constructs tree from the file that is given
|
|
as an argument and pretty-prints it.
|
|
|
|
Input file consists of lines, that include `key` and `rank` in form `key;rank`
|
|
or `nil`. Why would we have `nil` in a file? The file represents pre-order iteration
|
|
through the tree. Leaves never have rank different than 0, so you can safely assume
|
|
2 non-existing `nil`s in the input after you read such node ;)
|
|
|
|
<table>
|
|
<tr><th>Example input file</th><th>Tree it represents</th></tr>
|
|
<tr>
|
|
<td>
|
|
|
|
```
|
|
8;4
|
|
5;3
|
|
3;2
|
|
2;1
|
|
1;0
|
|
nil
|
|
4;0
|
|
7;1
|
|
6;0
|
|
nil
|
|
11;2
|
|
10;1
|
|
9;0
|
|
nil
|
|
12;0
|
|
```
|
|
|
|
</td>
|
|
<td>
|
|
|
|
|
|
|
|
</td>
|
|
</tr></table>
|
|
|
|
In this task you are only provided with different trees in the `test-trees` directory.
|
|
Implementation and format of the pretty-print is totally up to you. :)
|
|
|
|
Example of mine for the tree above:
|
|
|
|
```
|
|
8 (rank = 4)
|
|
+-- 5 (rank = 3)
|
|
| +-- 3 (rank = 2)
|
|
| | +-- 2 (rank = 1)
|
|
| | | +-- 1 (rank = 0)
|
|
| | +-- 4 (rank = 0)
|
|
| +-- 7 (rank = 1)
|
|
| +-- 6 (rank = 0)
|
|
+-- 11 (rank = 2)
|
|
+-- 10 (rank = 1)
|
|
| +-- 9 (rank = 0)
|
|
+-- 12 (rank = 0)
|
|
```
|
|
|
|
> Can you find out what are those trees? :)
|
|
|
|
## Submitting
|
|
|
|
In case you have any questions, feel free to reach out to me.
|
|
|
|
---
|
|
|
|
<!-- Ideally submit the assignment through the merge request. Step-by-step tutorial is
|
|
present [here](../mr). For setting assignee my xlogin is `xfocko`.
|
|
|
|
In case you do not want to experiment on GitLab, send me the source code via email,
|
|
but please prefix subject with: `[PB071/14][seminar-08]`
|
|
|
|
Deadline for the submission of the bonus is **May 4th 24:00**. -->
|