2021: d08: ex1: add solution

2021/d08/ex1/ex1.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from dataclasses import dataclass
+from typing import List, Set
+
+
+@dataclass
+class Entry:
+    signals: List[Set[str]]
+    outputs: List[Set[str]]
+
+
+def solve(input: List[str]) -> int:
+    def parse_entry(input: str) -> Entry:
+        signals, outputs = input.split(" | ")
+        return Entry(
+            [set(s) for s in signals.split()], [set(o) for o in outputs.split()]
+        )
+
+    entries = [parse_entry(line) for line in input]
+
+    return sum(
+        itertools.chain.from_iterable(
+            map(lambda __: 1, filter(lambda d: len(d) in (2, 3, 4, 7), entry.outputs))
+            for entry in entries
+        )
+    )
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()