diff --git a/rust/2023/README.md b/rust/2023/README.md index 317a63e..8fdd9dc 100644 --- a/rust/2023/README.md +++ b/rust/2023/README.md @@ -28,6 +28,7 @@ You try to ask why they can't just use a weather machine ("not powerful enough") | [Day 10: Pipe Maze](https://github.com/believer/advent-of-code/blob/master/rust/2023/src/day_10.rs) | 🌟 | 6882 | 🌟 | 491 | | [Day 11: Cosmic Expansion](https://github.com/believer/advent-of-code/blob/master/rust/2023/src/day_11.rs) | 🌟 | 9795148 | 🌟 | 650672493820 | | [Day 12: Hot Springs](https://github.com/believer/advent-of-code/blob/master/rust/2023/src/day_12.rs) | 🌟 | 8270 | 🌟 | 204640299929836 | +| [Day 13: Point of Incidence](https://github.com/believer/advent-of-code/blob/master/rust/2023/src/day_13.rs) | 🌟 | 27300 | 🌟 | 29276 | ## Performance @@ -47,6 +48,7 @@ With the help of [cargo-aoc](https://github.com/gobanos/cargo-aoc) I get automat | 10 | 65.17 µs | 65.01 µs | `-96.02%` / - | 50.84 µs | | 11 | 846.06 µs | 844.65 µs | | 75.21 µs | | 12 | 2.65 ms | 149.26 ms | | 113.10 µs | +| 13 | 24.87 µs | 17.61 µs | | 169.28 µs | \* compared to first solution
\*\* slow, didn't benchmark. 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+####...#.#....... + +#.######. +#.#....## +.#..#.### +.#..#.### +#.#....## +#.######. +......#.# +.#....#.# +#.######. +#.#....## +.#..#.### + +.##...#..#...##.. +##..#.####.#..### +#......#.......## +##..#..##..#..### +..###..##..###... +#..#..####..#..## +#.##.#....#.##.## +#.##.#....#.##.## +.###.#....#.###.. diff --git a/rust/2023/src/day_12.rs b/rust/2023/src/day_12.rs index 24dfb8d..f3a0d71 100644 --- a/rust/2023/src/day_12.rs +++ b/rust/2023/src/day_12.rs @@ -7,6 +7,9 @@ //! //! So, this solution was an iterative process of trying to understand and implementing //! the algorithm. +//! +//! I later tested a solutions using recursion and memoization. It was a bit easier to +//! understand, but it was also slower. use itertools::Itertools; diff --git a/rust/2023/src/day_13.rs b/rust/2023/src/day_13.rs new file mode 100644 index 0000000..2828bf9 --- /dev/null +++ b/rust/2023/src/day_13.rs @@ -0,0 +1,183 @@ +//! Day 13: Point of Incidence +//! +//! I had a super hard time understanding the problem description. I first thought that there +//! was just line (vertical or horizontal) in each pattern. Had to read and re-read it +//! multiple times before I understood. +//! +//! Haven't cleaned up part 2 yet, but it works. I'll get back to it later. + +use crate::grid::Grid; +use crate::point::Point; + +#[derive(Debug)] +pub struct Input { + patterns: Vec<(Grid, Vec)>, +} + +#[aoc_generator(day13)] +pub fn input_generator(input: &str) -> Input { + let patterns = input + .split("\n\n") + .map(|pattern| { + let grid: Grid = Grid::from(pattern); + let rocks = grid.find_all(b'#'); + + (grid, rocks) + }) + .collect::>(); + + Input { patterns } +} + +fn vertical_line(grid: &Grid, rocks: &[Point]) -> i32 { + let result = (1..grid.width).find(|&x| { + rocks.iter().all(|rock| { + let reflected = Point::new(2 * x - rock.x - 1, rock.y); + !grid.contains(reflected) || grid[reflected] != b'.' + }) + }); + + result.unwrap_or(0) +} + +fn horizontal_line(grid: &Grid, rocks: &[Point]) -> i32 { + let result = (1..grid.height).find(|&x| { + rocks.iter().all(|rock| { + let reflected = Point::new(rock.x, 2 * x - rock.y - 1); + !grid.contains(reflected) || grid[reflected] != b'.' + }) + }); + + result.map(|x| x * 100).unwrap_or(0) +} + +/* Part One +* +* +*/ +// Your puzzle answer was +#[doc = r#"``` +use advent_of_code_2023::day_13::*; +let data = include_str!("../input/2023/day13.txt"); +assert_eq!(solve_part_01(&input_generator(data)), 27300); +```"#] +#[aoc(day13, part1)] +pub fn solve_part_01(input: &Input) -> i32 { + input + .patterns + .iter() + .map(|(grid, rocks)| vertical_line(grid, rocks) + horizontal_line(grid, rocks)) + .sum() +} + +/* Part Two +* +* +*/ +#[doc = r#"``` +use advent_of_code_2023::day_13::*; +let data = include_str!("../input/2023/day13.txt"); +assert_eq!(solve_part_02(&input_generator(data)), 29276); +```"#] +#[aoc(day13, part2)] +pub fn solve_part_02(input: &Input) -> i32 { + input + .patterns + .iter() + .map(|(grid, rocks)| { + 'vertical: for x in 1..grid.width { + let mut smudges = 0; + for rock in rocks { + let reflected = Point::new(2 * x - rock.x - 1, rock.y); + + if grid.contains(reflected) && grid[reflected] == b'.' { + smudges += 1; + + if smudges > 1 { + continue 'vertical; + } + } + } + + if smudges == 1 { + return x; + } + } + + // Skip the first row + 'horizontal: for y in 1..grid.height { + let mut smudges = 0; + + for rock in rocks { + let reflected = Point::new(rock.x, 2 * y - rock.y - 1); + + if grid.contains(reflected) && grid[reflected] == b'.' { + smudges += 1; + + if smudges > 1 { + continue 'horizontal; + } + } + } + + if smudges == 1 { + return y * 100; + } + } + + unreachable!("This should never happen. Something blew up.") + }) + .sum() +} + +#[cfg(test)] +mod tests { + use super::*; + use rstest::rstest; + + #[rstest] + #[case( + "#.##..##. +..#.##.#. +##......# +##......# +..#.##.#. +..##..##. +#.#.##.#. + +#...##..# +#....#..# +..##..### +#####.##. +#####.##. +..##..### +#....#..#", + 405 + )] + fn sample_01(#[case] input: &str, #[case] expected: i32) { + assert_eq!(solve_part_01(&input_generator(input)), expected); + } + + #[rstest] + #[case( + "#.##..##. +..#.##.#. +##......# +##......# +..#.##.#. +..##..##. +#.#.##.#. + +#...##..# +#....#..# +..##..### +#####.##. +#####.##. +..##..### +#....#..#", + 400 + )] + fn sample_02(#[case] input: &str, #[case] expected: i32) { + assert_eq!(solve_part_02(&input_generator(input)), expected); + } +} diff --git a/rust/2023/src/grid.rs b/rust/2023/src/grid.rs index cce46a5..d0fd3c1 100644 --- a/rust/2023/src/grid.rs +++ b/rust/2023/src/grid.rs @@ -78,6 +78,10 @@ impl Grid { .map(|i| Point::new((i as i32) % self.width, (i as i32) / self.width)) .collect() } + + pub fn contains(&self, point: Point) -> bool { + point.x >= 0 && point.x < self.width && point.y >= 0 && point.y < self.height + } } /// Used to get a value using a Point as index from the grid diff --git a/rust/2023/src/lib.rs b/rust/2023/src/lib.rs index 0b22368..8702090 100644 --- a/rust/2023/src/lib.rs +++ b/rust/2023/src/lib.rs @@ -21,5 +21,6 @@ pub mod day_09; pub mod day_10; pub mod day_11; pub mod day_12; +pub mod day_13; aoc_lib! { year = 2023 }