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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| [package] | ||
| name = "AoC2024_15" | ||
| version = "0.1.0" | ||
| edition = "2021" | ||
|
|
||
| [dependencies] | ||
| aoc = { path = "../aoc" } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,204 @@ | ||
| #![allow(non_snake_case)] | ||
|
|
||
| use aoc::geometry::Direction; | ||
| use aoc::grid::{Cell, CharGrid, Grid}; | ||
| use aoc::Puzzle; | ||
| use std::collections::{HashMap, VecDeque}; | ||
| use std::str::FromStr; | ||
|
|
||
| struct AoC2024_15; | ||
|
|
||
| impl AoC2024_15 { | ||
| fn get_grid(&self, lines: &[String]) -> CharGrid { | ||
| CharGrid::from(&lines.iter().map(AsRef::as_ref).collect::<Vec<_>>()) | ||
| } | ||
|
|
||
| fn get_wide_grid(&self, lines: &[String]) -> CharGrid { | ||
| let mut grid: Vec<String> = vec![]; | ||
| for line in lines { | ||
| let mut row = String::new(); | ||
| line.chars().for_each(|ch| match ch { | ||
| '.' => row.push_str(".."), | ||
| 'O' => row.push_str("[]"), | ||
| '@' => row.push_str("@."), | ||
| '#' => row.push_str("##"), | ||
| _ => panic!(), | ||
| }); | ||
| grid.push(row); | ||
| } | ||
| CharGrid::from(&grid.iter().map(AsRef::as_ref).collect::<Vec<_>>()) | ||
| } | ||
|
|
||
| fn solve<F>( | ||
| &self, | ||
| grid: &mut CharGrid, | ||
| dirs: &Vec<Direction>, | ||
| get_to_move: F, | ||
| ) -> usize | ||
| where | ||
| F: Fn(&CharGrid, Cell, &Direction) -> Vec<Cell>, | ||
| { | ||
| let mut robot = grid.find_first_matching(|ch| ch == '@').unwrap(); | ||
| for dir in dirs { | ||
| let to_move = get_to_move(grid, robot, dir); | ||
| if to_move.is_empty() { | ||
| continue; | ||
| } | ||
| let vals: HashMap<(usize, usize), char> = to_move | ||
| .iter() | ||
| .map(|cell| ((cell.row, cell.col), grid.get(cell))) | ||
| .collect(); | ||
| robot = robot.try_at(*dir).unwrap(); | ||
| for cell in to_move.iter() { | ||
| grid.get_data_mut()[cell.row][cell.col] = '.'; | ||
| } | ||
| for cell in to_move.iter() { | ||
| let nxt = cell.try_at(*dir).unwrap(); | ||
| grid.get_data_mut()[nxt.row][nxt.col] = | ||
| *(vals.get(&(cell.row, cell.col)).unwrap()); | ||
| } | ||
| } | ||
| grid.cells() | ||
| .filter(|cell| grid.get(cell) == 'O' || grid.get(cell) == '[') | ||
| .map(|cell| (cell.row * 100 + cell.col)) | ||
| .sum() | ||
| } | ||
| } | ||
|
|
||
| impl aoc::Puzzle for AoC2024_15 { | ||
| type Input = (Vec<String>, Vec<Direction>); | ||
| type Output1 = usize; | ||
| type Output2 = usize; | ||
|
|
||
| aoc::puzzle_year_day!(2024, 15); | ||
|
|
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| fn parse_input(&self, lines: Vec<String>) -> Self::Input { | ||
| let mut dirs: Vec<Direction> = vec![]; | ||
| let mut blocks = lines.split(|line| line.is_empty()); | ||
| let grid = blocks.next().unwrap().to_vec(); | ||
| blocks.next().unwrap().iter().for_each(|line| { | ||
| line.chars() | ||
| .map(|ch| Direction::from_str(&ch.to_string()).unwrap()) | ||
| .for_each(|d| dirs.push(d)); | ||
| }); | ||
| (grid, dirs) | ||
| } | ||
|
|
||
| fn part_1(&self, input: &Self::Input) -> Self::Output1 { | ||
| let get_to_move = |grid: &CharGrid, robot: Cell, dir: &Direction| { | ||
| let mut to_move = vec![robot]; | ||
| let mut q: VecDeque<Cell> = VecDeque::from(vec![robot]); | ||
| while let Some(cell) = q.pop_front() { | ||
| let nxt = cell.try_at(*dir).unwrap(); | ||
| if to_move.contains(&nxt) { | ||
| continue; | ||
| } | ||
| match grid.get(&nxt) { | ||
| '#' => return vec![], | ||
| 'O' => { | ||
| to_move.push(nxt); | ||
| q.push_back(nxt); | ||
| } | ||
| _ => continue, | ||
| } | ||
| } | ||
| to_move | ||
| }; | ||
|
|
||
| let (grid, dirs) = input; | ||
| self.solve(&mut self.get_grid(grid), dirs, get_to_move) | ||
| } | ||
|
|
||
| fn part_2(&self, input: &Self::Input) -> Self::Output2 { | ||
| let get_to_move = |grid: &CharGrid, robot: Cell, dir: &Direction| { | ||
| let mut to_move = vec![robot]; | ||
| let mut q: VecDeque<Cell> = VecDeque::from(vec![robot]); | ||
| while let Some(cell) = q.pop_front() { | ||
| let nxt = cell.try_at(*dir).unwrap(); | ||
| if to_move.contains(&nxt) { | ||
| continue; | ||
| } | ||
| match grid.get(&nxt) { | ||
| '#' => return vec![], | ||
| '[' => { | ||
| let right = nxt.try_at(Direction::Right).unwrap(); | ||
| to_move.push(nxt); | ||
| q.push_back(nxt); | ||
| to_move.push(right); | ||
| q.push_back(right); | ||
| } | ||
| ']' => { | ||
| let left = nxt.try_at(Direction::Left).unwrap(); | ||
| to_move.push(nxt); | ||
| q.push_back(nxt); | ||
| to_move.push(left); | ||
| q.push_back(left); | ||
| } | ||
| _ => continue, | ||
| } | ||
| } | ||
| to_move | ||
| }; | ||
|
|
||
| let (grid, dirs) = input; | ||
| self.solve(&mut self.get_wide_grid(grid), dirs, get_to_move) | ||
| } | ||
|
|
||
| fn samples(&self) { | ||
| aoc::puzzle_samples! { | ||
| self, part_1, TEST1, 2028, | ||
| self, part_1, TEST2, 10092, | ||
| self, part_2, TEST2, 9021 | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| fn main() { | ||
| AoC2024_15 {}.run(std::env::args()); | ||
| } | ||
|
|
||
| const TEST1: &str = "\ | ||
| ######## | ||
| #..O.O.# | ||
| ##@.O..# | ||
| #...O..# | ||
| #.#.O..# | ||
| #...O..# | ||
| #......# | ||
| ######## | ||
| <^^>>>vv<v>>v<< | ||
| "; | ||
| const TEST2: &str = "\ | ||
| ########## | ||
| #..O..O.O# | ||
| #......O.# | ||
| #.OO..O.O# | ||
| #..O@..O.# | ||
| #O#..O...# | ||
| #O..O..O.# | ||
| #.OO.O.OO# | ||
| #....O...# | ||
| ########## | ||
| <vv>^<v^>v>^vv^v>v<>v^v<v<^vv<<<^><<><>>v<vvv<>^v^>^<<<><<v<<<v^vv^v>^ | ||
| vvv<<^>^v^^><<>>><>^<<><^vv^^<>vvv<>><^^v>^>vv<>v<<<<v<^v>^<^^>>>^<v<v | ||
| ><>vv>v^v^<>><>>>><^^>vv>v<^^^>>v^v^<^^>v^^>v^<^v>v<>>v^v^<v>v^^<^^vv< | ||
| <<v<^>>^^^^>>>v^<>vvv^><v<<<>^^^vv^<vvv>^>v<^^^^v<>^>vvvv><>>v^<<^^^^^ | ||
| ^><^><>>><>^^<<^^v>>><^<v>^<vv>>v>>>^v><>^v><<<<v>>v<v<v>vvv>^<><<>^>< | ||
| ^>><>^v<><^vvv<^^<><v<<<<<><^v<<<><<<^^<v<^^^><^>>^<v^><<<^>>^v<v^v<v^ | ||
| >^>>^v>vv>^<<^v<>><<><<v<<v><>v<^vv<<<>^^v^>^^>>><<^v>>v^v><^^>>^<>vv^ | ||
| <><^^>^^^<><vvvvv^v<v<<>^v<v>v<<^><<><<><<<^^<<<^<<>><<><^^^>^^<>^>v<> | ||
| ^^>vv<^v^v<vv>^<><v<^v>^^^>>>^^vvv^>vvv<>>>^<^>>>>>^<<^v>^vvv<>^<><<v> | ||
| v^^>>><<^^<>>^v^<v^vv<>v^<<>^<^v^v><^<<<><<^<v><v<>vv>>v><v^<vv<>v^<<^ | ||
| "; | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
|
|
||
| #[test] | ||
| pub fn samples() { | ||
| AoC2024_15 {}.samples(); | ||
| } | ||
| } |
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