2022: d04: ex2: add solution

2022/d04/ex2/ex2.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: list[str]) -> int:
+    def is_overlapping(line: str) -> bool:
+        def assignment_to_set(elf: str) -> set[int]:
+            start, end = elf.split("-")
+            return set(range(int(start), int(end) + 1))
+
+        elf1, elf2 = map(assignment_to_set, line.split(","))
+        return bool(elf1 & elf2)
+
+    return sum(map(is_overlapping, input))
+
+
+def main() -> None:
+    input = sys.stdin.read().splitlines()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()