Add day 4.

2022/day4.py

@@ -0,0 +1,19 @@
+# -*- encoding: utf-8 -*-
+
+import sys
+
+lines = [line.strip() for line in sys.stdin.readlines()]
+
+
+def make_range(value: str) -> set[int]:
+    parts = value.split("-")
+    return set(range(int(parts[0]), int(parts[1]) + 1))
+
+
+sections = [tuple(make_range(part) for part in line.split(",")) for line in lines]
+
+score_1 = sum(s1.intersection(s2) in (s1, s2) for s1, s2 in sections)
+print(f"score 1 is {score_1}")
+
+score_2 = sum(bool(s1.intersection(s2)) for s1, s2 in sections)
+print(f"score 1 is {score_2}")