2015: d01: ex2: add solution

2015/d01/ex2/ex2.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: str) -> int:
+    BASEMENT = -1
+    current = 0
+    for i, c in enumerate(input, start=1):
+        current += 1 if c == "(" else -1
+        if current == BASEMENT:
+            return i
+    assert False  # Sanity check
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()