Day 03

day03/part1.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+
+lines = (x.strip() for x in open("input.txt"))
+
+cnt = [0] * 12
+
+for line in lines:
+    cnt = [x+(int(char)*2-1) for x, char in zip(cnt, line)]
+
+gamma = int(''.join(['1' if x > 0 else '0' for x in cnt]), 2)
+epsilon = int(''.join(['1' if x < 0 else '0' for x in cnt]), 2)
+
+print(gamma * epsilon)