advent-of-code/2023
advent-of-code/2023
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day(13): transpose instead of a copy-paste

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Signed-off-by: Matej Focko <mfocko@redhat.com>
This commit is contained in:
Matej Focko 2023-12-13 21:47:47 +01:00
parent b3e7037f33
commit 0a4cc4c031
Signed by: mfocko
GPG key ID: 7C47D46246790496
1 changed files with 8 additions and 12 deletions
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20
src/bin/day13.rs
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@ -19,17 +19,13 @@ impl From<&[String]> for Pattern {
} }
impl Pattern { impl Pattern {
fn check_vertically(&self, allowed_error: usize) -> Option<i32> { fn transpose(&self) -> Pattern {
(0..self.map[0].len() - 1) let (m, n) = (self.map.len(), self.map[0].len());
.find(|&x| { Pattern {
let d = min(x + 1, self.map[0].len() - x - 1); map: (0..n)
.map(|x| (0..m).map(|y| self.map[y][x]).collect_vec())
iproduct!(0..self.map.len(), (1..=d)) .collect_vec(),
.filter(|&(y, dx)| self.map[y][x + 1 - dx] != self.map[y][x + dx]) }
.count()
== allowed_error
})
.map(|x| (x + 1) as i32)
} }
fn check_horizontally(&self, allowed_error: usize) -> Option<i32> { fn check_horizontally(&self, allowed_error: usize) -> Option<i32> {
@ -46,7 +42,7 @@ impl Pattern {
} }
fn score(&self, allowed_error: usize) -> i32 { fn score(&self, allowed_error: usize) -> i32 {
if let Some(s) = self.check_vertically(allowed_error) { if let Some(s) = self.transpose().check_horizontally(allowed_error) {
s s
} else if let Some(s) = self.check_horizontally(allowed_error) { } else if let Some(s) = self.check_horizontally(allowed_error) {
100 * s 100 * s