56 lines
1.4 KiB
Python
56 lines
1.4 KiB
Python
import fileinput
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from pprint import pprint
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from typing import List
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mem = {}
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for line in fileinput.input():
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l, r = line.strip().split(" = ")
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if l == "mask":
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and_mask = int(r.replace("X", "1"), base=2)
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or_mask = int(r.replace("X", "0"), base=2)
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else:
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value = int(r)
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value &= and_mask
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value |= or_mask
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mem[int(l[4:-1])] = value
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print(sum(mem.values()))
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def recurse(s: str) -> List[str]:
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x = s.find("X")
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if x == -1:
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return [s]
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s0 = s[:x] + '0' + s[x + 1:]
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s1 = s[:x] + '1' + s[x + 1:]
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return [*recurse(s0), *recurse(s1)]
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mem = {}
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for line in fileinput.input():
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l, r = line.strip().split(" = ")
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if l == "mask":
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mask = r
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or_mask = int(r.replace("X", "0"), base=2)
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floatings = recurse(r.replace("0", "_").replace("1", "_"))
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and_masks = [int(v.replace("_", "1"), 2) for v in floatings]
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or_masks = [int(v.replace("_", "0"), 2) for v in floatings]
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assert(len(and_masks) == 2 ** r.count("X"))
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assert(len(or_masks) == 2 ** r.count("X"))
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else:
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orig_address = int(l[4:-1])
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orig_address |= or_mask
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for (and_, or_) in zip(and_masks, or_masks):
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address = orig_address
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address &= and_
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address |= or_
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mem[address] = int(r)
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assert(address >= 0)
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assert(not [k for k in mem.keys() if k < 0])
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print(sum(mem.values()))
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