diff options
| author | Toby Vincent <tobyv@tobyvin.dev> | 2023-12-13 19:14:09 -0600 |
|---|---|---|
| committer | Toby Vincent <tobyv@tobyvin.dev> | 2023-12-14 17:11:00 -0600 |
| commit | 72a0110013c22953cc7f0a257dc8d277019c9af3 (patch) | |
| tree | 9cc43ca282167d7caf99f3872b7c15d29aabbf5e | |
| parent | 46e2184709040f948f8664a45a43f4959aed9183 (diff) | |
feat: impl day 13
| -rw-r--r-- | input/day_13.txt | 1353 | ||||
| -rw-r--r-- | src/day_13.rs | 219 | ||||
| -rw-r--r-- | src/lib.rs | 1 | ||||
| -rw-r--r-- | src/main.rs | 3 |
4 files changed, 1575 insertions, 1 deletions
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+....#.. +#####.. +.....## +.....## +.##.#.. +.##.### +####.## +....### +....#.. +###.#.. +.....## +####... +.##.### +.##.### +.##.#.. + +#.######.##.. +.#.####.#.### +###########.. +##..##..##.## +##.#..#.###.. +####..#####.. +..#....#..#.# +.#.####.#.#.. +##......##... +...........## +#.######.#... +#.#.##.#.#.## +#.##..##.#... +.#.####.#..## +#.##..##.#### +.#..##..#.#.. +#...##...#### + +###..#..##..#..## +..####......####. +..#.#.#....#.#.#. +...#.#......#.#.. +##.#.###..###.#.# +..##...####...##. +##..#.##..##.#..# +..#.#..#..##.#.#. +.....##.##.##.... +##.##.#....#.##.# +##..##.####.##..# + +#####.. +.###... +.###... +#####.. +....### +#...### +##.#... +#...#.. +.....## +###.### +#.#.#.# +.##..## +.#.#.## +.##.### +###.... +#.###.. +##..### + +..###..#. +..##...#. +..#.#.##. +...##.... +..#..#..# +..#.##### +##..#.#.# diff --git a/src/day_13.rs b/src/day_13.rs new file mode 100644 index 0000000..94b2d6c --- /dev/null +++ b/src/day_13.rs @@ -0,0 +1,219 @@ +use std::ops::{ControlFlow, Range}; + +use crate::{Problem, Solution}; + +pub struct Day13; + +impl Problem for Day13 { + const DAY: u8 = 13; + + const INPUT: &'static str = include_str!("../input/day_13.txt"); +} + +impl Solution for Day13 { + type Answer1 = usize; + + type Answer2 = usize; + + fn part_1(input: &str) -> anyhow::Result<Self::Answer1> { + let chunks = input + .trim() + .split("\n\n") + .map(std::str::FromStr::from_str) + .try_collect::<Vec<Chunk<0>>>()?; + + Ok(chunks + .into_iter() + .flat_map(|chunk| chunk.process_chunk()) + .sum()) + + // 32663 < + // 33975 == + } + + fn part_2(input: &str) -> anyhow::Result<Self::Answer2> { + let chunks = input + .trim() + .split("\n\n") + .map(std::str::FromStr::from_str) + .try_collect::<Vec<Chunk<1>>>()?; + + Ok(chunks + .into_iter() + .flat_map(|chunk| chunk.process_chunk()) + .sum()) + + // 29083 == + } +} + +type Predicate = fn(&[Vec<char>], &mut usize, usize, usize) -> bool; + +struct Chunk<const N: u8> { + inner: Vec<Vec<char>>, +} + +impl<const N: u8> Chunk<N> { + fn process_chunk(&self) -> Option<usize> { + self.find_items(0..self.inner.len() - 1, |v, s, i, j| { + *s += v[i].iter().zip(v[j].iter()).filter(|(l, r)| l != r).count(); + i == 0 || j == v.len() - 1 + }) + .map(|i| i * 100) + .or_else(|| { + self.find_items(0..self.inner[0].len() - 1, |v, s, i, j| { + *s += v.iter().filter(|line| line[i] != line[j]).count(); + i == 0 || j == v[0].len() - 1 + }) + }) + } + + fn find_items(&self, mut range: Range<usize>, pred: Predicate) -> Option<usize> { + range + .find(|index| self.check_chunk(index, pred)) + .map(|i| i + 1) + } + + fn check_chunk(&self, index: &usize, pred: Predicate) -> bool { + match self.check_item(index, 0, 0, pred) { + ControlFlow::Break(is_valid) => is_valid, + ControlFlow::Continue(_) => unreachable!(), + } + } + + fn check_item( + &self, + index: &usize, + width: usize, + mut state: usize, + pred: Predicate, + ) -> ControlFlow<bool, usize> { + let i = index - width; + let j = index + width + 1; + + let term = pred(&self.inner, &mut state, i, j); + + let state = if state > N.into() { + ControlFlow::Break(false) + } else if term { + ControlFlow::Break(state == N.into()) + } else { + ControlFlow::Continue(state) + }?; + + self.check_item(index, width + 1, state, pred) + } +} + +impl<const N: u8> std::str::FromStr for Chunk<N> { + type Err = std::convert::Infallible; + + fn from_str(s: &str) -> Result<Self, Self::Err> { + Ok(Self { + inner: s + .trim() + .lines() + .map(|l| l.trim().chars().collect::<Vec<_>>()) + .collect::<Vec<_>>(), + }) + } +} + +impl<const N: u8> std::fmt::Display for Chunk<N> { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + write!( + f, + "{}", + self.inner + .iter() + .map(|v| v.iter().collect::<String>()) + .collect::<Vec<_>>() + .join("\n") + ) + } +} + +#[cfg(test)] +mod tests { + use super::*; + + const INPUT_1: &str = indoc::indoc! {" + #.##..##. + ..#.##.#. + ##......# + ##......# + ..#.##.#. + ..##..##. + #.#.##.#. + + #...##..# + #....#..# + ..##..### + #####.##. + #####.##. + ..##..### + #....#..# + "}; + + const INPUT_2: &str = indoc::indoc! {" + #.##..##. + ..#.##.#. + ##......# + ##......# + ..#.##.#. + ..##..##. + #.#.##.#. + + #...##..# + #....#..# + ..##..### + #####.##. + #####.##. + ..##..### + #....#..# + + .#.##.#.# + .##..##.. + .#.##.#.. + #......## + #......## + .#.##.#.. + .##..##.# + + #..#....# + ###..##.. + .##.##### + .##.##### + ###..##.. + #..#....# + #..##...# + + #.##..##. + ..#.##.#. + ##..#...# + ##...#..# + ..#.##.#. + ..##..##. + #.#.##.#. + "}; + + #[test] + fn test_part_1() -> anyhow::Result<()> { + Ok(assert_eq!(405, Day13::part_1(INPUT_1)?)) + } + + #[test] + fn test_part_1_2() -> anyhow::Result<()> { + Ok(assert_eq!(709, Day13::part_1(INPUT_2)?)) + } + + #[test] + fn test_part_2_1() -> anyhow::Result<()> { + Ok(assert_eq!(400, Day13::part_2(INPUT_1)?)) + } + + #[test] + fn test_part_2_2() -> anyhow::Result<()> { + Ok(assert_eq!(1400, Day13::part_2(INPUT_2)?)) + } +} @@ -20,6 +20,7 @@ pub mod day_09; pub mod day_10; pub mod day_11; pub mod day_12; +pub mod day_13; pub trait Problem { const DAY: u8; diff --git a/src/main.rs b/src/main.rs index fa082b4..f7dd64e 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,7 +1,7 @@ use aoc_2023::{ day_01::Day01, day_02::Day02, day_03::Day03, day_04::Day04, day_05::Day05, day_06::Day06, day_07::Day07, day_08::Day08, day_09::Day09, day_10::Day10, day_11::Day11, day_12::Day12, - Solution, + day_13::Day13, Solution, }; fn main() -> anyhow::Result<()> { @@ -17,6 +17,7 @@ fn main() -> anyhow::Result<()> { Day10::solve()?; Day11::solve()?; Day12::solve()?; + Day13::solve()?; Ok(()) } |