Day 3, puzzle 2

This commit is contained in:
jazzpi 2022-12-13 14:56:46 +01:00
parent adb8cfd91a
commit 879c2c411c

17
src/bin/d3p2.rs Normal file

@ -0,0 +1,17 @@
use aoc22::day3;
use aoc22::util;
pub fn main() {
let rucksacks = day3::parse_rucksacks(&util::parse_input());
let mut sum = 0;
for group in rucksacks.chunks_exact(3) {
// Intersection of the unions of each rucksack's compartments
let common = &(&(&group[0].0 | &group[0].1) & &(&group[1].0 | &group[1].1))
& &(&group[2].0 | &group[2].1);
assert!(common.len() == 1);
sum += day3::priority(*common.iter().next().unwrap());
}
println!("Sum of priorities is {}", sum);
}