27 lines
803 B
Python
27 lines
803 B
Python
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# JS sucks
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for line in open('./y2024/resources/17_input.txt'):
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if line.startswith('Program:'):
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instructions = list(map(int, line.split(': ')[1].split(',')))
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def outFromA(a):
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interim = (a % 8) ^ 3
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c = a // (2 ** interim)
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postC = c ^ 6
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return (postC ^ (a % 8)) % 8
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candidates = [0]
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for i in range(len(instructions) - 1, -1, -1):
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newCandidates = []
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# print(f'Instruction: {instructions[i]}, candidates: {candidates}')
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for c in candidates:
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for j in range(8):
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num = (c << 3) + j
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out = outFromA(num)
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# print(f'Num: {num}, Out: {out}, Instruction: {instructions[i]}')
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if out == instructions[i]:
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newCandidates.append(num)
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candidates = newCandidates
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# print(candidates)
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print(min(candidates))
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