advent-of-code/2021/src/bin/day09.rs
2021-12-09 10:46:49 +01:00

67 lines
1.6 KiB
Rust

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