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