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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| [package] | ||
| name = "AoC2024_16" | ||
| version = "0.1.0" | ||
| edition = "2021" | ||
|
|
||
| [dependencies] | ||
| aoc = { path = "../aoc" } | ||
| itertools = "0.11" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| #![allow(non_snake_case)] | ||
|
|
||
| use aoc::geometry::{Direction, Turn}; | ||
| use aoc::graph::AStar; | ||
| use aoc::grid::{Cell, CharGrid, Grid}; | ||
| use aoc::Puzzle; | ||
| use itertools::Itertools; | ||
|
|
||
| #[derive(Copy, Clone, Debug, Eq, Hash, PartialEq)] | ||
| struct State { | ||
| pos: Cell, | ||
| dir: Direction, | ||
| } | ||
|
|
||
| struct AoC2024_16; | ||
|
|
||
| impl AoC2024_16 { | ||
| fn adjacent(&self, grid: &CharGrid, state: State) -> Vec<State> { | ||
| let mut dirs = vec![state.dir]; | ||
| [Turn::Right, Turn::Left] | ||
| .into_iter() | ||
| .map(|t| state.dir.turn(t)) | ||
| .for_each(|d| dirs.push(d)); | ||
| dirs.into_iter() | ||
| .map(|dir| State { | ||
| pos: state.pos.try_at(dir).unwrap(), | ||
| dir, | ||
| }) | ||
| .filter(|state| grid.get(&state.pos) != '#') | ||
| .collect_vec() | ||
| } | ||
| } | ||
|
|
||
| impl aoc::Puzzle for AoC2024_16 { | ||
| type Input = CharGrid; | ||
| type Output1 = usize; | ||
| type Output2 = usize; | ||
|
|
||
| aoc::puzzle_year_day!(2024, 16); | ||
|
|
||
| fn parse_input(&self, lines: Vec<String>) -> Self::Input { | ||
| CharGrid::from(&lines.iter().map(AsRef::as_ref).collect::<Vec<_>>()) | ||
| } | ||
|
|
||
| fn part_1(&self, grid: &Self::Input) -> Self::Output1 { | ||
| let start = Cell::at(grid.height() - 2, 1); | ||
| let end = Cell::at(1, grid.width() - 2); | ||
| AStar::distance( | ||
| State { | ||
| pos: start, | ||
| dir: Direction::Right, | ||
| }, | ||
| |state| state.pos == end, | ||
| |state| self.adjacent(grid, state), | ||
| |curr, next| if curr.dir == next.dir { 1 } else { 1001 }, | ||
| ) | ||
| } | ||
|
|
||
| fn part_2(&self, grid: &Self::Input) -> Self::Output2 { | ||
| let start = Cell::at(grid.height() - 2, 1); | ||
| let end = Cell::at(1, grid.width() - 2); | ||
| let result = AStar::all( | ||
| State { | ||
| pos: start, | ||
| dir: Direction::Right, | ||
| }, | ||
| |state| state.pos == end, | ||
| |state| self.adjacent(grid, state), | ||
| |curr, next| if curr.dir == next.dir { 1 } else { 1001 }, | ||
| ); | ||
| Direction::capital() | ||
| .into_iter() | ||
| .flat_map(|dir| { | ||
| result.get_paths(State { pos: end, dir }).into_iter() | ||
| }) | ||
| .flat_map(|path| path.into_iter()) | ||
| .map(|state| state.pos) | ||
| .unique() | ||
| .count() | ||
| } | ||
|
|
||
| fn samples(&self) { | ||
| aoc::puzzle_samples! { | ||
| self, part_1, TEST1, 7036, | ||
| self, part_1, TEST2, 11048, | ||
| self, part_2, TEST1, 45, | ||
| self, part_2, TEST2, 64 | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| fn main() { | ||
| AoC2024_16 {}.run(std::env::args()); | ||
| } | ||
|
|
||
| const TEST1: &str = "\ | ||
| ############### | ||
| #.......#....E# | ||
| #.#.###.#.###.# | ||
| #.....#.#...#.# | ||
| #.###.#####.#.# | ||
| #.#.#.......#.# | ||
| #.#.#####.###.# | ||
| #...........#.# | ||
| ###.#.#####.#.# | ||
| #...#.....#.#.# | ||
| #.#.#.###.#.#.# | ||
| #.....#...#.#.# | ||
| #.###.#.#.#.#.# | ||
| #S..#.....#...# | ||
| ############### | ||
| "; | ||
| const TEST2: &str = "\ | ||
| ################# | ||
| #...#...#...#..E# | ||
| #.#.#.#.#.#.#.#.# | ||
| #.#.#.#...#...#.# | ||
| #.#.#.#.###.#.#.# | ||
| #...#.#.#.....#.# | ||
| #.#.#.#.#.#####.# | ||
| #.#...#.#.#.....# | ||
| #.#.#####.#.###.# | ||
| #.#.#.......#...# | ||
| #.#.###.#####.### | ||
| #.#.#...#.....#.# | ||
| #.#.#.#####.###.# | ||
| #.#.#.........#.# | ||
| #.#.#.#########.# | ||
| #S#.............# | ||
| ################# | ||
| "; | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
|
|
||
| #[test] | ||
| pub fn samples() { | ||
| AoC2024_16 {}.samples(); | ||
| } | ||
| } |
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