kageru/advent-of-code
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optimize part 1

This commit is contained in:
kageru 2022-12-15 14:02:46 +01:00
parent d2e5c13586
commit f2a9208212
1 changed files with 8 additions and 3 deletions
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11
2022/src/bin/day15.rs
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@ -26,7 +26,7 @@ fn manhattan((x1, y1): (i64, i64), (x2, y2): (i64, i64)) -> u64 {
fn part1(parsed: &Parsed, y: i64) -> i64 {
let (&min_x, &max_x) = parsed.iter().map(|((x1, _), _)| x1).minmax().into_option().unwrap();
let mut x = min_x - *parsed.iter().map(|(_, d)| d).max().unwrap() as i64;
let mut c = 0;
let mut c = -1;
while x <= max_x {
match parsed.iter().find(|(p, d)| manhattan(*p, (x, y)) <= *d) {
Some(&((px, py), d)) => {
@ -34,10 +34,15 @@ fn part1(parsed: &Parsed, y: i64) -> i64 {
c += new_x - x;
x = new_x;
}
None => x += 1,
None => {
match parsed.iter().filter(|&&((x1, y1), d)| x1 > x && y1.abs_diff(y) < d).min_by_key(|&&(p, d)| manhattan(p, (x, y)) - d) {
Some(&((px, py), d)) => x = px - (d as i64 - (py.abs_diff(y) as i64)),
None => break,
};
}
};
}
c - 1
c
}
fn part2(parsed: &Parsed, bounds: i64) -> i64 {