From 879c2c411c63dae7d8f932856ab169283c3e88cf Mon Sep 17 00:00:00 2001
From: jazzpi <jasper@mezzo.de>
Date: Tue, 13 Dec 2022 14:56:46 +0100
Subject: [PATCH] Day 3, puzzle 2

---
 src/bin/d3p2.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 src/bin/d3p2.rs

diff --git a/src/bin/d3p2.rs b/src/bin/d3p2.rs
new file mode 100644
index 0000000..5722fa7
--- /dev/null
+++ b/src/bin/d3p2.rs
@@ -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);
+}