2023 - Day 21 [Part 1]
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131
2023/input/21/input
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2023/input/21/input
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11
2023/input/21/test-1
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...........
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.....###.#.
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.###.##..#.
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..#.#...#..
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....#.#....
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.##..S####.
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.##..#...#.
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.......##..
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.##.#.####.
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.##..##.##.
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...........
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176
2023/src/bin/day21.rs
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2023/src/bin/day21.rs
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#![feature(test)]
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use std::collections::{HashMap, HashSet, VecDeque};
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use anyhow::Result;
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use aoc::Solver;
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// -- Runners --
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fn main() -> Result<()> {
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Day::solve()
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn part1_test1() -> Result<()> {
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// The example provided uses 6 steps instead of 64, however this should be the correct
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// answer for 64 steps with the example
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Day::test(Day::part1, "test-1", 42)
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}
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#[test]
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fn part1_solution() -> Result<()> {
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Day::test(Day::part1, "input", 3642)
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}
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#[test]
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fn part2_test1() -> Result<()> {
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Day::test(Day::part2, "test-1", 1)
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}
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// Benchmarks
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extern crate test;
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#[bench]
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#[ignore]
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fn part1_bench(b: &mut test::Bencher) {
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Day::benchmark(Day::part1, b)
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}
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#[bench]
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#[ignore]
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fn part2_bench(b: &mut test::Bencher) {
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Day::benchmark(Day::part2, b)
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}
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}
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// -- Solution --
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pub struct Day;
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impl aoc::Solver for Day {
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type Output1 = usize;
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type Output2 = usize;
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fn day() -> u8 {
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21
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}
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fn part1(input: &str) -> Self::Output1 {
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let mut queue = Vec::new();
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let map: HashMap<(isize, isize), char> = input
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.lines()
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.enumerate()
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.flat_map(|(y, line)| {
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line.chars()
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.enumerate()
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.map(|(x, mut c)| {
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if c == 'S' {
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queue.push(((x as isize, y as isize), 64));
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c = '.';
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}
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((x as isize, y as isize), c)
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})
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.collect::<Vec<_>>()
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})
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.collect();
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let mut visited = HashSet::new();
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let directions = [(-1, 0), (1, 0), (0, -1), (0, 1)];
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// Depth first
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while let Some(step) = queue.pop() {
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// If we have already evaluated this state, do not add it to the queue
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if visited.contains(&step) {
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continue;
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}
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// Mark this node as visited
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visited.insert(step);
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// Check if we have ran out of steps
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if step.1 == 0 {
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continue;
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}
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// Try moving in all directions
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for direction in directions {
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let next = (
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(step.0 .0 + direction.0, step.0 .1 + direction.1),
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step.1 - 1,
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);
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// If the tile is free add it to the queue
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if let Some(&tile) = map.get(&next.0) {
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if tile == '.' {
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queue.push(next);
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}
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}
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}
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}
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visited.iter().filter(|step| step.1 == 0).count()
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}
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fn part2(input: &str) -> Self::Output2 {
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let height = input.lines().count();
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let width = input.lines().next().unwrap().chars().count();
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let mut queue = Vec::new();
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let map: HashMap<(isize, isize), char> = input
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.lines()
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.enumerate()
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.flat_map(|(y, line)| {
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line.chars()
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.enumerate()
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.map(|(x, mut c)| {
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if c == 'S' {
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queue.push(((x as isize, y as isize), 500));
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c = '.';
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}
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((x as isize, y as isize), c)
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})
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.collect::<Vec<_>>()
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})
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.collect();
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let mut visited = HashSet::new();
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let directions = [(-1, 0), (1, 0), (0, -1), (0, 1)];
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// Depth first
|
||||
while let Some(step) = queue.pop() {
|
||||
// If we have already evaluated this state, do not add it to the queue
|
||||
if visited.contains(&step) {
|
||||
continue;
|
||||
}
|
||||
|
||||
// Mark this node as visited
|
||||
visited.insert(step);
|
||||
|
||||
// Check if we have ran out of steps
|
||||
if step.1 == 0 {
|
||||
continue;
|
||||
}
|
||||
|
||||
// Try moving in all directions
|
||||
for direction in directions {
|
||||
let next = (
|
||||
(step.0 .0 + direction.0, step.0 .1 + direction.1),
|
||||
step.1 - 1,
|
||||
);
|
||||
|
||||
let next_wrapped = (
|
||||
next.0 .0.rem_euclid(width as isize),
|
||||
next.0 .1.rem_euclid(height as isize),
|
||||
);
|
||||
|
||||
// If the tile is free add it to the queue
|
||||
if let Some(&tile) = map.get(&next_wrapped) {
|
||||
if tile == '.' {
|
||||
queue.push(next);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
visited.iter().filter(|step| step.1 == 0).count()
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user