From c75b3d5b59d0dee2cf190c8cc2f01e1c6ad7f6ae Mon Sep 17 00:00:00 2001
From: Nathan van Ofwegen <nj.vanofwegen@gmail.com>
Date: Wed, 9 Dec 2020 09:54:44 +0100
Subject: [PATCH] day9pt1

---
 day9/day9.py | 32 +++++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/day9/day9.py b/day9/day9.py
index 3a6fa48..893cadc 100644
--- a/day9/day9.py
+++ b/day9/day9.py
@@ -1,12 +1,34 @@
+def valid(num, previous):
+    for i in range(0, len(previous)):
+        for j in range(0, len(previous)):
+            if previous[i] + previous[j] == num:
+                return True
+
+    return False
+
+
 def part1():
-    file = open("input_test.txt")
+    file = open("input.txt")
 
-    preamble_length = 5
+    preamble_length = 25
+    lines = file.readlines()
 
-    for line in file:
-        pass
+    queue = []
 
-    print("Part 1: %d")
+    for i in range(0, preamble_length):
+        number = int(lines[i])
+        queue.append(number)
+
+    for i in range(preamble_length, len(lines)):
+        number = int(lines[i])
+
+        if not valid(number, queue):
+            break
+
+        queue.pop(0)
+        queue.append(number)
+
+    print("Part 1: %d" % number)
 
 
 def part2():