janezicmatej
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aoc2023
generated from janezicmatej/aoc-template
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solution: day 13 clean

This commit is contained in:
Matej Janezic 2023-12-13 23:15:21 +01:00
parent 000002707d
commit 00000280ae
Signed by: janezicmatej
GPG Key ID: 4298E230ED37B2C0
1 changed files with 21 additions and 23 deletions
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44
src/bin/13.rs
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@ -1,23 +1,22 @@
fn mirror_h(shape: &Vec<Vec<char>>, smudges: usize) -> Option<usize> {
(1..shape.len())
.filter(|&i| {
shape
.iter()
.skip(i)
.zip(shape.iter().take(i).rev())
.map(|(x, y)| {
x.iter()
.zip(y.iter())
.map(|(xx, yy)| (xx != yy) as usize)
.sum::<usize>()
})
.sum::<usize>()
== smudges
})
.max()
fn mirror_h(shape: &[Vec<char>], smudges: usize) -> Option<usize> {
(1..shape.len()).find(|&i| {
shape
.iter()
.skip(i)
.zip(shape.iter().take(i).rev())
.map(|(x, y)| {
x.iter()
.zip(y.iter())
.map(|(xx, yy)| (xx != yy) as usize)
.sum::<usize>()
})
.sum::<usize>()
== smudges
})
}
fn mirror_v(shape: &Vec<Vec<char>>, smudges: usize) -> Option<usize> {
let shape = (0..shape[0].len())
fn mirror_v(shape: &[Vec<char>], smudges: usize) -> Option<usize> {
let shape: Vec<Vec<char>> = (0..shape[0].len())
.map(|col| (0..shape.len()).map(|row| shape[row][col]).collect())
.collect();
@ -28,10 +27,9 @@ fn solve(input: &str, smudges: usize) -> usize {
input
.split("\n\n")
.map(|x| x.lines().map(|line| line.chars().collect()).collect())
.map(|shape| {
let v = mirror_v(&shape, smudges).unwrap_or_default();
let h = mirror_h(&shape, smudges).unwrap_or_default();
v + h * 100
.map(|shape: Vec<Vec<char>>| {
mirror_v(&shape, smudges).unwrap_or_default()
+ mirror_h(&shape, smudges).unwrap_or_default() * 100
})
.sum()
}