Day 9

day09/part1.py

@@ -0,0 +1,16 @@
+from collections import deque
+from itertools import combinations
+
+lines = (int(x.strip()) for x in open("input.txt"))
+L = 25
+
+buffer = deque(maxlen=L)
+result = None
+
+for line in lines:
+    if len(buffer) == L:
+        found = any(a + b == line for a, b in combinations(buffer, 2))
+        if not found:
+            result = line
+            break
+    buffer.append(line)