2017: d17: ex2: add solution

2017/d17/ex2/ex2.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+import collections
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> int:
+        return int(input.strip())
+
+    lock = collections.deque([0])
+    step = parse(input)
+    for i in range(1, 50000000 + 1):
+        lock.rotate(-step)
+        lock.append(i)
+    return lock[lock.index(0) + 1]
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()