42 lines
1.2 KiB
Python
Executable file
42 lines
1.2 KiB
Python
Executable file
#!/usr/bin/env python
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import operator
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import sys
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def solve(input: str) -> int:
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def parse(input: list[str]) -> list[tuple[int, list[int]]]:
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return [
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(int(value), [int(n) for n in numbers.split()])
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for value, numbers in map(lambda l: l.split(": "), input)
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]
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def solvable(target: int, numbers: list[int]) -> bool:
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def concat(lhs: int, rhs: int) -> int:
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return int(str(lhs) + str(rhs))
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def helper(current_value: int, current_index: int) -> bool:
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next_index = current_index + 1
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if len(numbers) == next_index:
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return target == current_value
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if current_value > target:
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return False
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for op in (operator.add, operator.mul, concat):
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if helper(op(current_value, numbers[next_index]), next_index):
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return True
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return False
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return helper(numbers[0], 0)
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equations = parse(input.splitlines())
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return sum(value for value, numbers in equations if solvable(value, numbers))
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def main() -> None:
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input = sys.stdin.read()
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print(solve(input))
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if __name__ == "__main__":
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main()
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