Merge branch 'master' of https://github.com/Lucidiot/adventofcode

2017/13/firewall.py

@@ -0,0 +1,9 @@
+#!/usr/bin/env python3
+
+def scanner_pos(length, time):
+    offset = time % ((length - 1) * 2)
+    return 2 * (length - 1) - offset if offset > length - 1 else offset
+
+import sys
+ranges = {k: v for (k, v) in [tuple(map(int, l.strip().split(": "))) for l in sys.stdin.readlines()]}
+print(sum(pos * ranges[pos] for pos in ranges if scanner_pos(ranges[pos], pos) == 0))