67 lines
1.6 KiB
Rust
67 lines
1.6 KiB
Rust
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#![feature(test)]
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extern crate test;
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use aoc2021::common::*;
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const DAY: usize = 09;
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type Parsed = Vec<Vec<u8>>;
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fn parse_input(raw: &str) -> Parsed {
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raw.lines().map(|l| l.bytes().map(|b| b - b'0').collect()).collect()
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}
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fn part1(parsed: &Parsed) -> usize {
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(0..parsed.len())
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.flat_map(|x| (0..parsed[x].len()).map(move |y| (x, y)))
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.filter_map(|(x, y)| {
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// There’s gotta be some incomplete_windows or similar that makes this not as horrible
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let cur = parsed[x][y];
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[Step::XP, Step::XM, Step::YP, Step::YM]
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.into_iter()
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.filter_map(|s| try_step(x, y, s))
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.filter_map(|(x, y)| parsed.get(x).and_then(|ys| ys.get(y)))
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.all(|&n| n > cur)
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.then(|| cur as usize + 1)
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})
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.sum()
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}
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#[rustfmt::skip]
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enum Step { XP, XM, YP, YM }
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fn try_step(x: usize, y: usize, step: Step) -> Option<(usize, usize)> {
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match step {
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Step::XP => Some((x.checked_add(1)?, y)),
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Step::XM => Some((x.checked_sub(1)?, y)),
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Step::YP => Some((x, y.checked_add(1)?)),
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Step::YM => Some((x, y.checked_sub(1)?)),
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}
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}
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fn part2(parsed: &Parsed) -> usize {
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unimplemented!()
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}
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fn main() {
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let input = parse_input(&read_file(DAY));
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println!("Part 1: {}", part1(&input));
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println!("Part 2: {}", part2(&input));
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use aoc2021::*;
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const TEST_INPUT: &str = "2199943210
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3987894921
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9856789892
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8767896789
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9899965678";
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test!(part1() == 15);
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test!(part2() == 0);
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bench!(part1() == 478);
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bench!(part2() == 0);
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bench_input!(Vec::len => 100);
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}
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