20 lines
596 B
Plaintext
20 lines
596 B
Plaintext
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#!/usr/bin/python3
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import re
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mem = []
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with open("input") as fh:
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for ln in fh:
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if m := re.match(r"mask = ([01X]{36})", ln):
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mask = m.group(1)
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mask_and = int(mask.replace("1", "0").replace("X", "1"), base=2)
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mask_or = int(mask.replace("X", "0"), base=2)
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elif m:= re.match(r"mem\[(\d+)\] = (\d+)", ln):
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i = int(m.group(1))
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v = int(m.group(2))
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while i >= len(mem):
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mem.append(0)
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mem[i] = (v & mask_and) | mask_or
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else:
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raise RuntimeError(ln)
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print(sum(mem))
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