72 lines
1.8 KiB
Rust
72 lines
1.8 KiB
Rust
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#![feature(test)]
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extern crate test;
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use aoc2023::{boilerplate, common::*};
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use itertools::Itertools;
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const DAY: usize = 11;
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type I = usize;
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type Parsed = (Vec<I>, Vec<I>, Vec<(I, I)>);
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fn parse_input(raw: &str) -> Parsed {
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let galaxies = raw
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.lines()
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.enumerate()
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.flat_map(|(x, l)| l.bytes().enumerate().filter_map(move |(y, b)| (b == b'#').then_some((x, y))))
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.collect_vec();
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let &xmax = galaxies.iter().map(|(x, _)| x).max().unwrap();
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let &ymax = galaxies.iter().map(|(_, y)| y).max().unwrap();
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let mut xs = vec![true; xmax + 1];
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let mut ys = vec![true; ymax + 1];
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for &(x, y) in galaxies.iter() {
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xs[x] = false;
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ys[y] = false;
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}
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(
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xs.into_iter().enumerate().filter_map(|(x, b)| b.then_some(x)).collect(),
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ys.into_iter().enumerate().filter_map(|(y, b)| b.then_some(y)).collect(),
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galaxies,
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)
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}
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fn distance<const FACTOR: usize>(x1: &I, x2: &I, empty: &[I]) -> I {
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let smaller_x = x1.min(x2);
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let bigger_x = x1.max(x2);
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empty.iter().filter(|x| (smaller_x..=bigger_x).contains(x)).count() * FACTOR + bigger_x - smaller_x
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}
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fn solve<const FACTOR: usize>((empty_x, empty_y, galaxies): &Parsed) -> usize {
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galaxies
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.iter()
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.tuple_combinations()
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.map(|((x1, y1), (x2, y2))| distance::<FACTOR>(x1, x2, empty_x) + distance::<FACTOR>(y1, y2, empty_y))
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.sum()
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}
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fn part1(parsed: &Parsed) -> usize {
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solve::<1>(parsed)
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}
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fn part2(parsed: &Parsed) -> usize {
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solve::<999_999>(parsed)
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}
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boilerplate! {
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TEST_INPUT == "\
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...#......
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.......#..
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#.........
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..........
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......#...
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.#........
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.........#
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..........
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.......#..
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#...#.....",
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tests: {
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part1: { TEST_INPUT => 374 },
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},
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bench1 == 9623138,
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bench2 == 726820169514,
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bench_parse: |(a, b, c): &Parsed| (a.len(), b.len(), c.len()) => (9, 11, 432),
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}
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