Day 09

day09/part2.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+from math import comb
+
+lines = (x.strip() for x in open("input.txt"))
+result = 0
+
+for line in lines:
+    numbers = [int(x) for x in line.split(" ")]
+    result += sum((idx%2*-2+1) * comb(len(numbers), idx+1) * val for idx, val in enumerate(numbers))
+
+print(result)