101 lines
2.7 KiB
Rust
101 lines
2.7 KiB
Rust
#![feature(test, try_blocks)]
|
|
extern crate test;
|
|
use aoc2023::{boilerplate, common::*};
|
|
|
|
const DAY: usize = 13;
|
|
type Parsed = Vec<Vec<Vec<bool>>>;
|
|
|
|
fn parse_input(raw: &str) -> Parsed {
|
|
raw.split("\n\n").map(|block| block.lines().map(|l| l.bytes().map(|b| b == b'#').collect()).collect()).collect()
|
|
}
|
|
|
|
fn find_reflection(block: &[Vec<bool>], blacklist: Option<usize>) -> Option<usize> {
|
|
'outer: for i in 0..block.len() - 1 {
|
|
let mut offset = 0;
|
|
loop {
|
|
match try { (block.get(i.checked_sub(offset)?)?, block.get(i + 1 + offset)?) } {
|
|
None if Some(i) != blacklist => return Some(i + 1),
|
|
Some((a, b)) if a == b => offset += 1,
|
|
_ => continue 'outer,
|
|
}
|
|
}
|
|
}
|
|
None
|
|
}
|
|
|
|
fn part1(blocks: &Parsed) -> usize {
|
|
blocks
|
|
.iter()
|
|
.map(|block| find_reflection(block, None).map(|n| n * 100).or_else(|| find_reflection(&transpose(block), None)).unwrap())
|
|
.sum()
|
|
}
|
|
|
|
fn transpose(orig: &[Vec<bool>]) -> Vec<Vec<bool>> {
|
|
let mut out = vec![vec![false; orig.len()]; orig[0].len()];
|
|
for i in 0..orig.len() {
|
|
#[allow(clippy::needless_range_loop)]
|
|
for j in 0..orig[0].len() {
|
|
out[j][i] = orig[i][j];
|
|
}
|
|
}
|
|
out
|
|
}
|
|
|
|
fn part2(blocks: &Parsed) -> usize {
|
|
blocks
|
|
.iter()
|
|
.map(|block| {
|
|
let mut block = block.to_owned();
|
|
let mut transposed = transpose(&block);
|
|
let p1 = find_reflection(&block, None).map(|n| n - 1);
|
|
let p1_transposed = find_reflection(&transposed, None).map(|n| n - 1);
|
|
for i in 0..block.len() {
|
|
for j in 0..block[0].len() {
|
|
block[i][j] ^= true;
|
|
transposed[j][i] ^= true;
|
|
if let Some(reflection) =
|
|
find_reflection(&block, p1).map(|n| n * 100).or_else(|| find_reflection(&transposed, p1_transposed))
|
|
{
|
|
return reflection;
|
|
}
|
|
block[i][j] ^= true;
|
|
transposed[j][i] ^= true;
|
|
}
|
|
}
|
|
unreachable!()
|
|
})
|
|
.sum()
|
|
}
|
|
|
|
boilerplate! {
|
|
TEST_INPUT_HORIZONTAL == "\
|
|
#...##..#
|
|
#....#..#
|
|
..##..###
|
|
#####.##.
|
|
#####.##.
|
|
..##..###
|
|
#....#..#",
|
|
TEST_INPUT_VERTICAL == "\
|
|
#.##..##.
|
|
..#.##.#.
|
|
##......#
|
|
##......#
|
|
..#.##.#.
|
|
..##..##.
|
|
#.#.##.#."
|
|
for tests: {
|
|
part1: {
|
|
TEST_INPUT_HORIZONTAL => 400,
|
|
TEST_INPUT_VERTICAL => 5,
|
|
},
|
|
part2: {
|
|
TEST_INPUT_HORIZONTAL => 100,
|
|
TEST_INPUT_VERTICAL => 300,
|
|
},
|
|
},
|
|
bench1 == 37561,
|
|
bench2 == 31108,
|
|
bench_parse: Vec::len => 100,
|
|
}
|