2022: d10: ex1: add solution

2022/d10/ex1/ex1.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+
+import dataclasses
+import sys
+from collections.abc import Iterable, Iterator
+
+
+@dataclasses.dataclass
+class CPU:
+    x: int = dataclasses.field(default=1, init=False)
+    cycle: int = dataclasses.field(default=0, init=False)
+
+    def execute(self, instructions: Iterable[str]) -> Iterator[int]:
+        for instr in instructions:
+            yield from self.execute_once(instr)
+
+    def execute_once(self, instruction: str) -> Iterator[int]:
+        if instruction == "noop":
+            yield from self.__do_cycle()
+        else:
+            assert instruction.startswith("addx")
+            yield from self.__do_cycle(2)
+            self.x += int(instruction.split()[1])
+
+    def __do_cycle(self, cycles: int = 1) -> Iterator[int]:
+        for _ in range(cycles):
+            self.cycle += 1
+            yield self.cycle
+
+
+def solve(input: list[str]) -> int:
+    cpu = CPU()
+    return sum(cycle * cpu.x for cycle in cpu.execute(input) if (cycle % 40) == 20)
+
+
+def main() -> None:
+    input = sys.stdin.read().splitlines()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()