From e65c17c8e643062bf6d558ff13fcacc954a93573 Mon Sep 17 00:00:00 2001
From: Keenan Tims <ktims@gotroot.ca>
Date: Sun, 17 Dec 2023 20:55:42 -0800
Subject: [PATCH] day17: don't revisit the start position

---
 17/src/main.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/17/src/main.rs b/17/src/main.rs
index fa5cafb..4a164ab 100644
--- a/17/src/main.rs
+++ b/17/src/main.rs
@@ -311,6 +311,7 @@ impl<'a> WalkCost2<'a> {
                             weight: cur_move.weight + self.map.map[new_pos.1][new_pos.0],
                         })
                     })
+                    .filter(|m| m.new_pos != self.start)
                     .filter(|m| *m.dir != cur_move.dir.opposite())
                     .filter(|m| {
                         if m.dir == cur_move.dir {