51 lines
1.4 KiB
Python
51 lines
1.4 KiB
Python
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import re
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from collections import namedtuple
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from typing import Generator, List, TextIO
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Mul = namedtuple("Mul", ["x", "y"])
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MulPattern = re.compile(r"mul\((\d{1,3}),(\d{1,3})\)")
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ExtendedPattern = re.compile(r"(?P<op_mul>mul)\((\d{1,3}),(\d{1,3})\)|(?P<op_do>do)\(\)|(?P<op_dont>don't)\(\)")
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def parse_mul_ops(f: TextIO) -> List[Mul]:
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input_string = f.read()
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return [Mul(int(x), int(y)) for x, y in MulPattern.findall(input_string)]
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def parse_mul_ops_extended(f: TextIO) -> Generator[Mul, None, None]:
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input_string = f.read()
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mul_enabled = True
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for match in ExtendedPattern.finditer(input_string):
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if match.group("op_dont"):
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mul_enabled = False
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elif match.group("op_do"):
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mul_enabled = True
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if match.group("op_mul") and mul_enabled:
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yield Mul(int(match.group(2)), int(match.group(3)))
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def main():
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input_file = "input.txt"
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total = 0
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total_extended = 0
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with open(input_file, "r") as f:
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for x, y in parse_mul_ops(f):
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print(f"mul({x}, {y}) = {x * y}")
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total += x * y
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with open(input_file, "r") as f:
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for x, y in parse_mul_ops_extended(f):
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print(f"mul({x}, {y}) = {x * y}")
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total_extended += x * y
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print(f"total = {total}")
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print(f"total_extended = {total_extended}")
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if __name__ == "__main__":
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main()
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