This commit is contained in:
Moritz Hölting 2023-12-14 19:45:04 +01:00
parent 16987a4bf8
commit d93dc91117
5 changed files with 419 additions and 0 deletions

7
Cargo.lock generated
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@ -159,6 +159,13 @@ dependencies = [
"rayon", "rayon",
] ]
[[package]]
name = "day-14"
version = "0.0.0"
dependencies = [
"indoc",
]
[[package]] [[package]]
name = "deprecate-until" name = "deprecate-until"
version = "0.1.1" version = "0.1.1"

7
day-14/Cargo.toml Normal file
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@ -0,0 +1,7 @@
[package]
name = "day-14"
version = "0.0.0"
edition = "2021"
[dev-dependencies]
indoc.workspace = true

100
day-14/src/bin/input.txt Normal file
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O.O#..O.#...#..O.O#..O#...O..O.#...O#.OO.O...#....#.O.##..####.OOO....OO......##..........#O.#O.O.#.
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OO....O#O.O.#.#.##O#.#O#....#....O.O.......O.O.OO....O#.....O.O.OO#.##.O.#..##O..O..O#O......O...O#O
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O.#OO#OOO..O.#..OO..O......#O...O....##..#..#O...OO#.#.OO........O.#...O..O#OOO.O....##.O.O........#
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....#O.#..#.#..........OO...O..........O....O#...#OO.......O...O.#OO..OOO....O.O#..O.O.###..O.O#...O
O...#..OO....O.......#.OO...O........O.OO..#..#..#.#.O..O.#....O.O......OO..OO.O..#..OOO#..OOO......
.OO#.O.....O..#...O.....O....O#........#....#.....O..#..###...#.O.......OO......O..O.OO..O..#.O#O#..
O....O...##.#....#O..O.#......................O..O#OOO..##....#.#..O.O.....O#..O.O.O...#.#.OOO...O..
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O...#OO.O.OO#..O....##O...#....#...#.O.O..O.........#..##.#O.#.OO..OO...#...O.O#.OO..#.O.OO#.#..##OO
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.....#....#....OO....#....O.#O..O...O#O..#...###....O.....O........##.#.#..#.O.OO.#O.O.O..#...O#O..O
.OO.....O.O.....#....O.O....O......O#O....O#.#..O....O.#............#..O.#.....OO....O...O....O.#.O.
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.O....O...O....#.O......#..##O.#..O..O.....O...OO..###....#..#..#..........#.#.#.#.#........O...O.O.
.OOO.#.#O....O.#...OO#.##...#...O.#...OO..###..OO.#.O....O..OO#..O..O....O#.#.O####..O....O..O#O....
.OO.OO#......#....#..##O#O...OO....#....O......OO..OOO.....##.......O#.#.O.#O......O..#.#O..O.O..#..

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day-14/src/bin/part1.rs Normal file
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use std::cmp::Ordering;
fn main() {
println!("{}", part1(include_str!("./input.txt")));
}
fn part1(input: &str) -> usize {
let slid_lines = slide_north(input);
slid_lines
.iter()
.enumerate()
.map(|(i, line)| line.iter().filter(|c| **c == 'O').count() * (slid_lines.len() - i))
.sum()
}
fn slide_north(input: &str) -> Vec<Vec<char>> {
let lines = input.lines().collect::<Vec<_>>();
let columns = (0..lines[0].len())
.map(|i| {
let mut column = lines
.iter()
.map(|row| row.chars().nth(i).unwrap())
.collect::<Vec<_>>();
// bubble sort
for n in (1..column.len()).rev() {
for j in 0..n {
if sort_slide_north(&column[j], &column[j + 1]) == Ordering::Greater {
column.swap(j, j + 1);
}
}
}
column
})
.collect::<Vec<_>>();
(0..columns[0].len())
.map(|i| {
columns
.iter()
.map(|column| *column.get(i).unwrap())
.collect::<Vec<_>>()
})
.collect::<Vec<_>>()
}
fn sort_slide_north(a: &char, b: &char) -> Ordering {
if a == &'#' || b == &'#' {
Ordering::Equal
} else if a == &'.' && b == &'O' {
Ordering::Greater
} else if a == &'O' && b == &'.' {
Ordering::Less
} else {
a.cmp(b)
}
}
#[cfg(test)]
mod tests {
use super::*;
use indoc::indoc;
const INPUT: &str = indoc!(
"
O....#....
O.OO#....#
.....##...
OO.#O....O
.O.....O#.
O.#..O.#.#
..O..#O..O
.......O..
#....###..
#OO..#....
"
);
#[test]
fn test_part1() {
assert_eq!(part1(INPUT), 136);
}
#[test]
fn test_slide_north() {
assert_eq!(
slide_north(INPUT)
.iter()
.map(|line| line.iter().collect::<String>())
.collect::<Vec<_>>()
.join("\n"),
indoc!(
"
OOOO.#.O..
OO..#....#
OO..O##..O
O..#.OO...
........#.
..#....#.#
..O..#.O.O
..O.......
#....###..
#....#...."
)
);
}
}

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day-14/src/bin/part2.rs Normal file
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use std::{cmp::Ordering, collections::HashMap};
const REPETITIONS: u32 = 1_000_000_000;
fn main() {
println!("{}", part2(include_str!("./input.txt")));
}
fn part2(input: &str) -> usize {
let mut lines = input
.lines()
.map(|l| l.chars().collect())
.collect::<Vec<Vec<_>>>();
let mut seen = HashMap::new();
seen.insert(lines.clone(), 0);
let mut stop_at = None;
for i in 1..REPETITIONS + 1 {
lines = cycle(lines);
// stop at correct iteration
if stop_at.is_some_and(|j| j == i) {
break;
}
// check if we've seen this before & calculate where to stop
if seen.contains_key(&lines) && stop_at.is_none() {
let repeat_period = i - seen.get(&lines).unwrap();
stop_at = Some(i + ((REPETITIONS - i) % repeat_period));
}
seen.insert(lines.clone(), i);
}
lines
.iter()
.enumerate()
.map(|(i, line)| line.iter().filter(|c| **c == 'O').count() * (lines.len() - i))
.sum()
}
fn cycle(matrix: Vec<Vec<char>>) -> Vec<Vec<char>> {
let north_lines = transmute(slide_rows_left(transmute(matrix)));
let west_lines = slide_rows_left(north_lines);
let south_lines = transmute(reverse_rows(slide_rows_left(reverse_rows(transmute(
west_lines,
)))));
reverse_rows(slide_rows_left(reverse_rows(south_lines)))
}
fn transmute<T: Copy>(matrix: Vec<Vec<T>>) -> Vec<Vec<T>> {
(0..matrix[0].len())
.map(|i| {
matrix
.iter()
.map(|row| *row.get(i).unwrap())
.collect::<Vec<_>>()
})
.collect::<Vec<_>>()
}
fn reverse_rows<T: Copy>(matrix: Vec<Vec<T>>) -> Vec<Vec<T>> {
matrix
.iter()
.map(|row| {
let mut row = row.clone();
row.reverse();
row
})
.collect::<Vec<_>>()
}
fn slide_rows_left(lines: Vec<Vec<char>>) -> Vec<Vec<char>> {
lines
.into_iter()
.map(|mut row| {
for n in (1..row.len()).rev() {
for i in 0..n {
if sort_slide_line(&row[i], &row[i + 1]) == Ordering::Greater {
row.swap(i, i + 1);
}
}
}
row
})
.collect()
}
fn sort_slide_line(a: &char, b: &char) -> Ordering {
if a == &'#' || b == &'#' {
Ordering::Equal
} else if a == &'.' && b == &'O' {
Ordering::Greater
} else if a == &'O' && b == &'.' {
Ordering::Less
} else {
a.cmp(b)
}
}
#[cfg(test)]
mod tests {
use super::*;
use indoc::indoc;
const INPUT: &str = indoc!(
"
O....#....
O.OO#....#
.....##...
OO.#O....O
.O.....O#.
O.#..O.#.#
..O..#O..O
.......O..
#....###..
#OO..#....
"
);
#[test]
fn test_part2() {
assert_eq!(part2(INPUT), 64);
}
#[test]
fn test_cycle() {
let lines = INPUT
.lines()
.map(|l| l.chars().collect())
.collect::<Vec<Vec<char>>>();
// one cycle
assert_eq!(
cycle(lines.clone()),
indoc!(
"
.....#....
....#...O#
...OO##...
.OO#......
.....OOO#.
.O#...O#.#
....O#....
......OOOO
#...O###..
#..OO#...."
)
.lines()
.map(|l| l.chars().collect())
.collect::<Vec<Vec<_>>>()
);
// two cycles
assert_eq!(
cycle(cycle(lines.clone())),
indoc!(
"
.....#....
....#...O#
.....##...
..O#......
.....OOO#.
.O#...O#.#
....O#...O
.......OOO
#..OO###..
#.OOO#...O"
)
.lines()
.map(|l| l.chars().collect())
.collect::<Vec<Vec<_>>>()
);
// three cycles
assert_eq!(
cycle(cycle(cycle(lines.clone()))),
indoc!(
"
.....#....
....#...O#
.....##...
..O#......
.....OOO#.
.O#...O#.#
....O#...O
.......OOO
#...O###.O
#.OOO#...O"
)
.lines()
.map(|l| l.chars().collect())
.collect::<Vec<Vec<_>>>()
);
}
}