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Solve 2021/04

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Alfred Melch 3 years ago
parent 861dfd0bc5
commit 5dceaa5e57
10 changed files with 937 additions and 1 deletions
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7
2021/day04/Cargo.lock generated
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "day04"
version = "0.1.0"

8
2021/day04/Cargo.toml
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[package]
name = "day04"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]

97
2021/day04/README.md
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https://adventofcode.com/2021/day/4
## \--- Day 4: Giant Squid ---
You're already almost 1.5km (almost a mile) below the surface of the ocean,
already so deep that you can't see any sunlight. What you _can_ see, however,
is a giant squid that has attached itself to the outside of your submarine.
Maybe it wants to play
[bingo](https://en.wikipedia.org/wiki/Bingo_\(American_version\))?
Bingo is played on a set of boards each consisting of a 5x5 grid of numbers.
Numbers are chosen at random, and the chosen number is _marked_ on all boards
on which it appears. (Numbers may not appear on all boards.) If all numbers in
any row or any column of a board are marked, that board _wins_. (Diagonals
don't count.)
The submarine has a _bingo subsystem_ to help passengers (currently, you and
the giant squid) pass the time. It automatically generates a random order in
which to draw numbers and a random set of boards (your puzzle input). For
example:
[code]
7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
22 13 17 11 0
8 2 23 4 24
21 9 14 16 7
6 10 3 18 5
1 12 20 15 19
3 15 0 2 22
9 18 13 17 5
19 8 7 25 23
20 11 10 24 4
14 21 16 12 6
14 21 17 24 4
10 16 15 9 19
18 8 23 26 20
22 11 13 6 5
2 0 12 3 7
[/code]
After the first five numbers are drawn (`7`, `4`, `9`, `5`, and `11`), there
are no winners, but the boards are marked as follows (shown here adjacent to
each other to save space):
[code]
22 13 17 _11_ 0 3 15 0 2 22 14 21 17 24 _4_
8 2 23 _4_ 24 _9_ 18 13 17 _5_ 10 16 15 _9_ 19
21 _9_ 14 16 _7_ 19 8 _7_ 25 23 18 8 23 26 20
6 10 3 18 _5_ 20 _11_ 10 24 _4_ 22 _11_ 13 6 _5_
1 12 20 15 19 14 21 16 12 6 2 0 12 3 _7_
[/code]
After the next six numbers are drawn (`17`, `23`, `2`, `0`, `14`, and `21`),
there are still no winners:
[code]
22 13 _17_ _11_ _0_ 3 15 _0_ _2_ 22 _14_ _21_ _17_ 24 _4_
8 _2_ _23_ _4_ 24 _9_ 18 13 _17_ _5_ 10 16 15 _9_ 19
_21_ _9_ _14_ 16 _7_ 19 8 _7_ 25 _23_ 18 8 _23_ 26 20
6 10 3 18 _5_ 20 _11_ 10 24 _4_ 22 _11_ 13 6 _5_
1 12 20 15 19 _14_ _21_ 16 12 6 _2_ _0_ 12 3 _7_
[/code]
Finally, `24` is drawn:
[code]
22 13 _17_ _11_ _0_ 3 15 _0_ _2_ 22 _14_ _21_ _17_ _24_ _4_
8 _2_ _23_ _4_ _24_ _9_ 18 13 _17_ _5_ 10 16 15 _9_ 19
_21_ _9_ _14_ 16 _7_ 19 8 _7_ 25 _23_ 18 8 _23_ 26 20
6 10 3 18 _5_ 20 _11_ 10 _24_ _4_ 22 _11_ 13 6 _5_
1 12 20 15 19 _14_ _21_ 16 12 6 _2_ _0_ 12 3 _7_
[/code]
At this point, the third board _wins_ because it has at least one complete row
or column of marked numbers (in this case, the entire top row is marked: `_14
21 17 24 4_`).
The _score_ of the winning board can now be calculated. Start by finding the
_sum of all unmarked numbers_ on that board; in this case, the sum is `188`.
Then, multiply that sum by _the number that was just called_ when the board
won, `24`, to get the final score, `188 * 24 = _4512_`.
To guarantee victory against the giant squid, figure out which board will win
first. _What will your final score be if you choose that board?_

19
2021/day04/input/example0
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7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
22 13 17 11 0
8 2 23 4 24
21 9 14 16 7
6 10 3 18 5
1 12 20 15 19
3 15 0 2 22
9 18 13 17 5
19 8 7 25 23
20 11 10 24 4
14 21 16 12 6
14 21 17 24 4
10 16 15 9 19
18 8 23 26 20
22 11 13 6 5
2 0 12 3 7

5
2021/day04/input/example1
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22 13 17 _11_ 0 3 15 0 2 22 14 21 17 24 _4_
8 2 23 _4_ 24 _9_ 18 13 17 _5_ 10 16 15 _9_ 19
21 _9_ 14 16 _7_ 19 8 _7_ 25 23 18 8 23 26 20
6 10 3 18 _5_ 20 _11_ 10 24 _4_ 22 _11_ 13 6 _5_
1 12 20 15 19 14 21 16 12 6 2 0 12 3 _7_

5
2021/day04/input/example2
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22 13 _17_ _11_ _0_ 3 15 _0_ _2_ 22 _14_ _21_ _17_ 24 _4_
8 _2_ _23_ _4_ 24 _9_ 18 13 _17_ _5_ 10 16 15 _9_ 19
_21_ _9_ _14_ 16 _7_ 19 8 _7_ 25 _23_ 18 8 _23_ 26 20
6 10 3 18 _5_ 20 _11_ 10 24 _4_ 22 _11_ 13 6 _5_
1 12 20 15 19 _14_ _21_ 16 12 6 _2_ _0_ 12 3 _7_

5
2021/day04/input/example3
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22 13 _17_ _11_ _0_ 3 15 _0_ _2_ 22 _14_ _21_ _17_ _24_ _4_
8 _2_ _23_ _4_ _24_ _9_ 18 13 _17_ _5_ 10 16 15 _9_ 19
_21_ _9_ _14_ 16 _7_ 19 8 _7_ 25 _23_ 18 8 _23_ 26 20
6 10 3 18 _5_ 20 _11_ 10 _24_ _4_ 22 _11_ 13 6 _5_
1 12 20 15 19 _14_ _21_ 16 12 6 _2_ _0_ 12 3 _7_

601
2021/day04/input/input
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26,55,7,40,56,34,58,90,60,83,37,36,9,27,42,19,46,18,49,52,75,17,70,41,12,78,15,64,50,54,2,77,76,10,43,79,22,32,47,0,72,30,21,82,6,95,13,59,16,89,1,85,57,62,81,38,29,80,8,67,20,53,69,25,23,61,86,71,68,98,35,31,4,33,91,74,14,28,65,24,97,88,3,39,11,93,66,44,45,96,92,51,63,84,73,99,94,87,5,48
62 5 77 94 75
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40 89 67 98 16
47 59 96 63 95
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35 45 65 50 91

189
2021/day04/src/main.rs
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use std::io::stdin;
use std::io::BufRead;
const BOARD_SIZE: usize = 5;
fn main() {
let args: Vec<String> = std::env::args().collect();
if args.len() > 1 && args[1] == "part1" {
part1();
} else {
part2();
}
}
fn part1() {
println!("Hallo Part1");
let mut numbers = String::new();
stdin().read_line(&mut numbers).ok();
let numbers = numbers.trim();
// dbg!(numbers);
let numbers: Vec<i32> = numbers.split(",").map(|num| num.parse().unwrap()).collect();
dbg!(&numbers);
stdin().read_line(&mut String::new()).ok();
let mut boards = Vec::new();
let mut board_numbers = Vec::new();
for line in stdin().lock().lines() {
let line = line.unwrap();
let line = line.trim();
if line == "" {
boards.push(Board::new(board_numbers));
board_numbers = Vec::new();
continue;
}
let mut line: Vec<i32> = line
.split_whitespace()
.map(|num| num.parse().unwrap())
.collect();
board_numbers.append(&mut line);
}
boards.push(Board::new(board_numbers));
'outer: for number in numbers {
for board in boards.iter_mut() {
board.draw(number);
if board.is_winning() {
board.print();
let sum = board.sum_of_unmarked();
let final_score = sum * number;
dbg!(final_score);
break 'outer;
}
}
}
}
fn part2() {
println!("Hallo Part2");
let mut numbers = String::new();
stdin().read_line(&mut numbers).ok();
let numbers = numbers.trim();
// dbg!(numbers);
let numbers: Vec<i32> = numbers.split(",").map(|num| num.parse().unwrap()).collect();
dbg!(&numbers);
stdin().read_line(&mut String::new()).ok();
let mut boards = Vec::new();
let mut board_numbers = Vec::new();
for line in stdin().lock().lines() {
let line = line.unwrap();
let line = line.trim();
if line == "" {
boards.push(Board::new(board_numbers));
board_numbers = Vec::new();
continue;
}
let mut line: Vec<i32> = line
.split_whitespace()
.map(|num| num.parse().unwrap())
.collect();
board_numbers.append(&mut line);
}
boards.push(Board::new(board_numbers));
for number in numbers {
for board in boards.iter_mut() {
board.draw(number);
}
if boards.len() > 1 {
boards.retain(|board| !board.is_winning());
println!("Boards after {}: {}", number, boards.len());
continue;
}
let board = &boards[0];
if board.is_winning() {
board.print();
let score = board.sum_of_unmarked();
let final_score = score * number;
dbg!(number);
dbg!(score);
dbg!(final_score);
break;
}
}
}
#[derive(Debug)]
struct Board {
numbers: [i32; BOARD_SIZE * BOARD_SIZE],
drawn: [bool; BOARD_SIZE * BOARD_SIZE],
}
impl Board {
fn new(numbers: Vec<i32>) -> Board {
Board {
numbers: numbers.try_into().unwrap(),
drawn: [false; BOARD_SIZE * BOARD_SIZE],
}
}
fn get(&self, x: usize, y: usize) -> (i32, bool) {
let idx = x * BOARD_SIZE + y;
(self.numbers[idx], self.drawn[idx])
}
fn find(&self, number: i32) -> Option<usize> {
self.numbers.iter().position(|&num| num == number)
}
fn draw(&mut self, number: i32) {
match self.find(number) {
Some(idx) => self.drawn[idx] = true,
None => (),
}
}
fn is_winning(&self) -> bool {
for row in 0..5 {
let check = self.drawn[row * 5..row * 5 + 5].iter().all(|&x| x);
if check {
return true;
}
}
for column in 0..5 {
let check = self.drawn[column..].iter().step_by(5).all(|&x| x);
if check {
return true;
}
}
return false;
}
fn sum_of_unmarked(&self) -> i32 {
let mut sum = 0;
for (idx, mark) in self.drawn.into_iter().enumerate() {
if !mark {
sum += self.numbers[idx];
}
}
return sum;
}
fn print(&self) {
for x in 0..BOARD_SIZE {
for y in 0..BOARD_SIZE {
let (num, drawn) = self.get(x, y);
let strike = match drawn {
true => "\x1b[9m",
false => "\x1b[0m",
};
print!("{}{: >2}\x1b[0m ", strike, num);
}
print!("\n");
}
}
}

2
README.md
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@ -4,4 +4,4 @@
cd to day folder.
`find . | entr -cr -s 'cat input/input | cargo run'`
`find src | entr -cr -s 'cat input/input | cargo run'`

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