From 67c9cf039173ff13f52ae447b264349b74fdb567 Mon Sep 17 00:00:00 2001
From: Hubert Van De Walle <hubv@protonmail.com>
Date: Wed, 9 Dec 2020 10:37:24 +0100
Subject: [PATCH] Fix off by one error

---
 days/src/main/kotlin/Day09.kt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/days/src/main/kotlin/Day09.kt b/days/src/main/kotlin/Day09.kt
index e18e731..ab3b5db 100644
--- a/days/src/main/kotlin/Day09.kt
+++ b/days/src/main/kotlin/Day09.kt
@@ -25,8 +25,8 @@ class Day09(@Lines val input: Input<LongArray>) {
     }
 
     private fun isValid(windowStart: Int, last: Long): Boolean {
-        for (i in windowStart..windowStart + 25) {
-            for (j in windowStart + 1..windowStart + 25) {
+        for (i in windowStart until windowStart + 25) {
+            for (j in windowStart + 1 until windowStart + 25) {
                 val f = input.value[i]
                 val s = input.value[j]
                 if (f + s == last && f != s) return true