From e2544f51609a16fffb20160466ba15bdb00a5af7 Mon Sep 17 00:00:00 2001
From: Antoine Martin <antoine97.martin@gmail.com>
Date: Thu, 10 Dec 2020 15:16:41 +0100
Subject: [PATCH] 2020: day10: use windows for part 1

---
 aoc2020/src/day10.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/aoc2020/src/day10.rs b/aoc2020/src/day10.rs
index a162b8f..0090fce 100644
--- a/aoc2020/src/day10.rs
+++ b/aoc2020/src/day10.rs
@@ -39,7 +39,9 @@ fn part1(input: &str) -> aoc::Result<usize> {
 
     let mut differences: [usize; 4] = [0; 4];
 
-    for (prev, next) in jolts.iter().zip(jolts.iter().skip(1)) {
+    for window in jolts.windows(2) {
+        let prev = window[0];
+        let next = window[1];
         let difference = (next - prev) as usize;
         differences[difference] += 1;
     }