From bcb7d535a4c70c53a1c2b8689fdf35263b8d336d Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Tue, 1 Dec 2020 21:45:41 -0800
Subject: [PATCH] Use xor in part 2 of day 2.

---
 day2.cr | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/day2.cr b/day2.cr
index 5020481..f411574 100644
--- a/day2.cr
+++ b/day2.cr
@@ -30,7 +30,7 @@ def part2
     min, max, char, str = data
     min -= 1
     max -= 1
-    ((str[min] == char) || (str[max] == char) ) && str[min] != str[max]
+    (str[min] == char) ^ (str[max] == char)
   end
 
   puts total