diff options
| author | Jesse Luehrs <doy@tozt.net> | 2023-12-13 00:57:17 -0500 |
|---|---|---|
| committer | Jesse Luehrs <doy@tozt.net> | 2023-12-13 00:57:17 -0500 |
| commit | 94d4fc2fc3a181bd79f92eb6d93c833e88e6e802 (patch) | |
| tree | 89b0f147bfb7f288953d36189de8f677db2b6300 | |
| parent | 747edc0066c138718c86ed7cdb9d1685b2ca81a7 (diff) | |
| download | advent-of-code-94d4fc2fc3a181bd79f92eb6d93c833e88e6e802.tar.gz advent-of-code-94d4fc2fc3a181bd79f92eb6d93c833e88e6e802.zip | |
day 13
| -rw-r--r-- | benches/2023.rs | 5 | ||||
| -rw-r--r-- | data/2023/13.txt | 1339 | ||||
| -rw-r--r-- | src/bin/2023/day13.rs | 102 | ||||
| -rw-r--r-- | src/bin/2023/main.rs | 2 | ||||
| -rw-r--r-- | src/grid.rs | 8 |
5 files changed, 1456 insertions, 0 deletions
diff --git a/benches/2023.rs b/benches/2023.rs index d6daad9..211b2f4 100644 --- a/benches/2023.rs +++ b/benches/2023.rs @@ -25,6 +25,8 @@ mod day10; mod day11; #[path = "../src/bin/2023/day12.rs"] mod day12; +#[path = "../src/bin/2023/day13.rs"] +mod day13; // NEXT MOD day!(2023, 1, day1); @@ -39,6 +41,7 @@ day!(2023, 9, day9); day!(2023, 10, day10); day!(2023, 11, day11); day!(2023, 12, day12); +day!(2023, 13, day13); // NEXT DAY fn bench_2023(c: &mut criterion::Criterion) { @@ -56,6 +59,7 @@ fn bench_2023(c: &mut criterion::Criterion) { day_combined!(2023, 10, day10); day_combined!(2023, 11, day11); day_combined!(2023, 12, day12); + day_combined!(2023, 13, day13); // NEXT DAY COMBINED }) }); @@ -76,5 +80,6 @@ criterion::criterion_main!( bench_2023day10, bench_2023day11, bench_2023day12, + bench_2023day13, // NEXT GROUP ); diff --git a/data/2023/13.txt b/data/2023/13.txt new file mode 100644 index 0000000..83d53a2 --- /dev/null +++ b/data/2023/13.txt @@ -0,0 +1,1339 @@ +.###...####.. 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+impl Mirror { + fn score(&self) -> usize { + match self { + Self::Horizontal(n) => 100 * n, + Self::Vertical(n) => *n, + } + } +} + +fn find_mirror(pattern: &Grid<bool>, smudges: usize) -> Mirror { + 'mirror: for row in pattern.each_row().skip(1) { + let mut found_smudges = 0; + for offset in 0..row.min(pattern.rows() - row.0).0 { + let a = pattern.row_vec(row + offset); + let b = pattern.row_vec(row - offset - 1); + found_smudges += a + .into_iter() + .zip(b.into_iter()) + .filter(|(a, b)| a != b) + .count(); + if found_smudges > smudges { + continue 'mirror; + } + } + if found_smudges != smudges { + continue 'mirror; + } + return Mirror::Horizontal(row.0); + } + + 'mirror: for col in pattern.each_col().skip(1) { + let mut found_smudges = 0; + for offset in 0..col.min(pattern.cols() - col.0).0 { + let a = pattern.col_vec(col + offset); + let b = pattern.col_vec(col - offset - 1); + found_smudges += a + .into_iter() + .zip(b.into_iter()) + .filter(|(a, b)| a != b) + .count(); + if found_smudges > smudges { + continue 'mirror; + } + } + if found_smudges != smudges { + continue 'mirror; + } + return Mirror::Vertical(col.0); + } + + unreachable!() +} + +pub fn parse(fh: File) -> Result<Vec<Grid<bool>>> { + let mut lines = parse::raw_lines(fh).peekable(); + let mut grids = vec![]; + while lines.peek().is_some() { + grids + .push(parse::grid(parse::chunk(&mut lines), |c, _, _| c == b'#')); + } + Ok(grids) +} + +pub fn part1(patterns: Vec<Grid<bool>>) -> Result<i64> { + Ok(patterns + .into_iter() + .map(|pattern| find_mirror(&pattern, 0).score()) + .sum::<usize>() + .try_into() + .unwrap()) +} + +pub fn part2(patterns: Vec<Grid<bool>>) -> Result<i64> { + Ok(patterns + .into_iter() + .map(|pattern| find_mirror(&pattern, 1).score()) + .sum::<usize>() + .try_into() + .unwrap()) +} + +#[test] +fn test() { + assert_eq!( + part1(parse(parse::data(2023, 13).unwrap()).unwrap()).unwrap(), + 37975 + ); + assert_eq!( + part2(parse(parse::data(2023, 13).unwrap()).unwrap()).unwrap(), + 32497 + ); +} diff --git a/src/bin/2023/main.rs b/src/bin/2023/main.rs index 591fdc8..2ee1dc4 100644 --- a/src/bin/2023/main.rs +++ b/src/bin/2023/main.rs @@ -23,6 +23,7 @@ mod day9; mod day10; mod day11; mod day12; +mod day13; // NEXT MOD #[paw::main] @@ -41,6 +42,7 @@ fn main(opt: Opt) -> Result<()> { 10 => advent_of_code::day!(2023, opt.day, opt.puzzle, day10), 11 => advent_of_code::day!(2023, opt.day, opt.puzzle, day11), 12 => advent_of_code::day!(2023, opt.day, opt.puzzle, day12), + 13 => advent_of_code::day!(2023, opt.day, opt.puzzle, day13), // NEXT PART _ => panic!("unknown day {}", opt.day), } diff --git a/src/grid.rs b/src/grid.rs index f299bee..b006882 100644 --- a/src/grid.rs +++ b/src/grid.rs @@ -269,6 +269,10 @@ impl<T: Clone + Eq + PartialEq + std::hash::Hash> Grid<T> { (0..self.rows().0).map(Row) } + pub fn row_vec(&self, row: Row) -> Vec<T> { + self.rows[row.0].cells.clone() + } + pub fn cols(&self) -> Col { Col(self.rows[0].cells.len()) } @@ -280,6 +284,10 @@ impl<T: Clone + Eq + PartialEq + std::hash::Hash> Grid<T> { (0..self.cols().0).map(Col) } + pub fn col_vec(&self, col: Col) -> Vec<T> { + self.rows.iter().map(|row| row[col].clone()).collect() + } + pub fn get(&self, row: Row) -> Option<&GridRow<T>> { self.rows.get(row.0) } |