42 lines
1.2 KiB
Python
42 lines
1.2 KiB
Python
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from itertools import product
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def tokenize(vals: list[int], ops: list[str]) -> list[str|int]:
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tok = []
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for item in zip(vals, ops):
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tok.extend(item)
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tok.append(vals[-1])
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return tok
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def compute(tokens: list[str|int]) -> int:
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# Case where we have 1 || 2 ==> 12
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while len(tokens) >= 3:
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# Pop off the first 3 items
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left, op, right = tokens[:3]
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tokens = tokens[3:] if len(tokens) > 3 else []
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# Now we do some computation and prepend the list with that result
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if op == '*':
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tokens.insert(0, left * right)
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elif op == '+':
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tokens.insert(0, left + right)
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# the coalesce case
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else:
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tokens.insert(0, int(f'{left}{right}'))
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return tokens[0]
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with open('input.data') as file:
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cases = []
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for line in file:
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line = line.replace(':', '').split()
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cases.append([int(val) for val in line])
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s = 0
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for case in cases:
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answer, vals = case[0], case[1:]
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results = set()
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for ops in list(product(['*', '+', '||'], repeat=len(vals)-1)):
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tokens = tokenize(vals, ops)
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results.add(compute(tokens))
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if answer in results:
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s += answer
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print(s)
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