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Add day6 part1
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‎input/2024/day6.txt‎

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‎src/day6.rs‎

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use aoc_runner_derive::{aoc, aoc_generator};
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#[derive(Debug)]
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pub struct Map {
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map: Vec<Vec<char>>,
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current: (usize, usize),
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}
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#[aoc_generator(day6)]
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pub fn input_generator(input: &str) -> Map {
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Map {
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map: input.lines().map(|l| l.chars().collect()).collect(),
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current: input
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.lines()
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.enumerate()
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.find_map(|(row, line)| line.chars().position(|c| c == '^').map(|col| (row, col)))
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.unwrap(),
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}
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}
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enum Direction {
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Up,
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Down,
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Left,
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Right,
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}
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impl Direction {
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// Clockwise 90-degree rotation
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fn rotate(self) -> Self {
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match self {
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Direction::Up => Direction::Right,
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Direction::Right => Direction::Down,
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Direction::Down => Direction::Left,
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Direction::Left => Direction::Up,
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}
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}
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}
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#[aoc(day6, part1)]
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pub fn part1(input: &Map) -> usize {
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let mut direction: Direction = Direction::Up;
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let (mut y, mut x) = input.current;
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let mut new_map = input.map.clone();
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let mut count = 0;
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while y < input.map.len() && x < input.map[y].len() {
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if input.map[y][x] == '#' {
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// put back
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match direction {
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Direction::Up => y += 1,
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Direction::Down => y -= 1,
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Direction::Left => x += 1,
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Direction::Right => x -= 1,
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}
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direction = direction.rotate();
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} else if new_map[y][x] != 'X' {
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count += 1;
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new_map[y][x] = 'X';
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}
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match direction {
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Direction::Up => y -= 1,
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Direction::Down => y += 1,
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Direction::Left => x -= 1,
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Direction::Right => x += 1,
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}
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}
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count
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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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const INPUT: &str = "....#.....
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.........#
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..........
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..#.......
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.......#..
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..........
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.#..^.....
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........#.
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#.........
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......#...";
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#[test]
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fn test_part1() {
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assert_eq!(41, part1(&input_generator(INPUT)))
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}
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// #[test]
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// fn test_part2() {
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// assert_eq!(123, part2(&input_generator(INPUT)))
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// }
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}

‎src/lib.rs‎

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mod day3;
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mod day4;
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mod day5;
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mod day6;
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aoc_lib! { year = 2024 }

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