From a3f9edd48dd4e79355cec5e1ceb64f38c23c2a9c Mon Sep 17 00:00:00 2001
From: Bert Peters <bert@bertptrs.nl>
Date: Sun, 18 Dec 2022 22:57:19 +0100
Subject: [PATCH] Disturbingly simple optimization

---
 2022/src/day17.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/2022/src/day17.rs b/2022/src/day17.rs
index 7b54a44..a8270e0 100644
--- a/2022/src/day17.rs
+++ b/2022/src/day17.rs
@@ -35,7 +35,7 @@ fn collides(shape: &[&[bool]], cavern: &IndexSet, x: usize, y: usize) -> bool {
             return true;
         }
 
-        for (col, &on) in line.iter().enumerate() {
+        for (col, &on) in line.iter().enumerate().rev() {
             if on && cavern.contains((y - row) * WIDTH + x + col) {
                 return true;
             }