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Signed-off-by: Andrej Orsula <orsula.andrej@gmail.com>
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| use aoc_runner_derive::aoc; | ||
| use itertools::Itertools; | ||
|
|
||
| #[aoc(day8, part1)] | ||
| #[must_use] | ||
| pub fn part1(input: &str) -> usize { | ||
| let map = Map::parse(input); | ||
| map.nodes() | ||
| .iter() | ||
| .filter(|node| !node.is_empty()) | ||
| .flat_map(|node| { | ||
| node.iter() | ||
| .permutations(2) | ||
| .map(|pair| (pair[0], pair[1])) | ||
| .filter_map(|(&(x1, y1), &(x2, y2))| { | ||
| if let (Some(x), Some(y)) = ((2 * x2).checked_sub(x1), (2 * y2).checked_sub(y1)) | ||
| { | ||
| if x < map.ncols() && y < map.nrows() { | ||
| return Some((x, y)); | ||
| } | ||
| } | ||
| None | ||
| }) | ||
| }) | ||
| .collect::<rustc_hash::FxHashSet<_>>() | ||
| .len() | ||
| } | ||
|
|
||
| #[aoc(day8, part2)] | ||
| #[must_use] | ||
| pub fn part2(input: &str) -> usize { | ||
| let map = Map::parse(input); | ||
| let (ncols, nrows) = (map.ncols() as i16, map.nrows() as i16); | ||
| map.nodes() | ||
| .iter() | ||
| .filter(|node| !node.is_empty()) | ||
| .flat_map(|node| { | ||
| node.iter() | ||
| .permutations(2) | ||
| .map(|pair| (pair[0], pair[1])) | ||
| .flat_map(|(&(x1, y1), &(x2, y2))| { | ||
| let (x1, y1, x, y) = (x1 as i16, y1 as i16, x2 as i16, y2 as i16); | ||
| let (dx, dy) = ((x - x1), (y - y1)); | ||
| std::iter::successors(Some((x, y)), move |(x, y)| { | ||
| let (x, y) = (x + dx, y + dy); | ||
| if x >= 0 && y >= 0 && x < ncols && y < nrows { | ||
| return Some((x, y)); | ||
| } | ||
| None | ||
| }) | ||
| }) | ||
| }) | ||
| .collect::<rustc_hash::FxHashSet<_>>() | ||
| .len() | ||
| } | ||
|
|
||
| #[repr(transparent)] | ||
| #[derive(Clone, derive_more::Deref, derive_more::DerefMut)] | ||
| struct Map(nalgebra::DMatrix<u8>); | ||
|
|
||
| impl Map { | ||
| fn parse(input: &str) -> Self { | ||
| let input = input.as_bytes(); | ||
| let width = input.iter().position(|&c| c == b'\n').unwrap(); | ||
| let mut map = nalgebra::DMatrix::from_element(width, input.len() / width, b'.'); | ||
| input.chunks(width + 1).enumerate().for_each(|(y, line)| { | ||
| line.iter().enumerate().for_each(|(x, c)| match c { | ||
| b'.' | b'\n' => {} | ||
| _ => map[(x, y)] = *c, | ||
| }); | ||
| }); | ||
| Self(map) | ||
| } | ||
|
|
||
| fn nodes(&self) -> [smallvec::SmallVec<[(usize, usize); 4]>; u8::MAX as usize] { | ||
| let mut nodes = std::array::from_fn(|_| smallvec::SmallVec::new()); | ||
| (0..self.ncols()) | ||
| .cartesian_product(0..self.nrows()) | ||
| .filter(|&(y, x)| self[(x, y)] != b'.') | ||
| .for_each(|(y, x)| { | ||
| nodes[self[(x, y)] as usize].push((x, y)); | ||
| }); | ||
| nodes | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
| use indoc::indoc; | ||
|
|
||
| const SAMPLE: &str = indoc! {" | ||
| ............ | ||
| ........0... | ||
| .....0...... | ||
| .......0.... | ||
| ....0....... | ||
| ......A..... | ||
| ............ | ||
| ............ | ||
| ........A... | ||
| .........A.. | ||
| ............ | ||
| ............ | ||
| "}; | ||
|
|
||
| const SAMPLE2: &str = indoc! {" | ||
| T......... | ||
| ...T...... | ||
| .T........ | ||
| .......... | ||
| .......... | ||
| .......... | ||
| .......... | ||
| .......... | ||
| .......... | ||
| .......... | ||
| "}; | ||
|
|
||
| #[test] | ||
| pub fn part1_example() { | ||
| assert_eq!(part1(SAMPLE), 14); | ||
| } | ||
|
|
||
| #[test] | ||
| pub fn part2_example() { | ||
| assert_eq!(part2(SAMPLE), 34); | ||
| assert_eq!(part2(SAMPLE2), 9); | ||
| } | ||
| } |
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