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day10: performance. slight gain from memoizing visited positions in p1.

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This commit is contained in:
Keenan Tims
2024-12-10 17:07:00 -08:00
parent d9d55b069f
commit 8af11a6092
1 changed files with 6 additions and 2 deletions
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8
10/src/main.rs
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@@ -58,9 +58,13 @@ impl TrailMap {
.collect_vec()
}
fn count_reachable_from(&self, pos: &(i64, i64), needle: u8, visited: &mut Grid<bool>) -> u64 {
let our_val = self.map.get(pos.0, pos.1).unwrap();
if our_val == needle && visited.get(pos.0, pos.1) == Some(false) {
if visited.get(pos.0, pos.1) == Some(true) {
return 0;
} else {
visited.set(pos.0, pos.1, true);
}
let our_val = self.map.get(pos.0, pos.1).unwrap();
if our_val == needle {
return 1;
} else if our_val == needle {
return 0;