From 9184f6adfd069995f70e5f08a3b4159176f9e367 Mon Sep 17 00:00:00 2001
From: Jeremy Kaplan <jdkaplan@metagram.net>
Date: Fri, 2 Dec 2022 21:48:20 -0800
Subject: [PATCH] Reduced!

---
 2022/src/bin/day03.rs | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/2022/src/bin/day03.rs b/2022/src/bin/day03.rs
index ce7f24b..f364e2f 100644
--- a/2022/src/bin/day03.rs
+++ b/2022/src/bin/day03.rs
@@ -36,13 +36,10 @@ fn part2(input: &str) -> usize {
     let mut sum = 0;
     let lines = input.split('\n').filter(|l| !l.is_empty());
     for group in &lines.chunks(3) {
-        let sets: Vec<HashSet<char>> = group
+        let shared: HashSet<char> = group
             .map(|rucksack| rucksack.chars().collect::<HashSet<char>>())
-            .collect();
-
-        let mut shared = sets[0].clone();
-        shared = shared.intersection(&sets[1]).cloned().collect();
-        shared = shared.intersection(&sets[2]).cloned().collect();
+            .reduce(|acc, item| acc.intersection(&item).cloned().collect())
+            .unwrap();
 
         let badge = shared.iter().next().unwrap();