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#!/usr/bin/env python3
def bitmask(mask: str, num: int) -> tuple[int, ...]:
binary = bin(num)[2:]
binary = binary.zfill(36)
res = ""
for i in range(len(binary)):
if mask[i] == "0":
res += binary[i]
else:
res += mask[i]
n = res.count("X")
combos = tuple(bin(i)[2:].zfill(n) for i in range(2 << n - 1))
acc: list[str] = []
for combo in combos:
temp = res
for i in range(n):
temp = temp.replace("X", combo[i], 1)
acc.append(temp)
return tuple(int(x, 2) for x in acc)
def main() -> None:
with open("input", "r", encoding="utf-8") as f:
lines = f.read().splitlines()
mem: dict[str, int] = {}
mask = ""
for line in lines:
match line.split(" "):
case ["mask", _, mask]:
mask = mask
case [addr, _, val]:
address = addr[4:-1]
addresses = bitmask(mask, int(address))
for a in addresses:
mem[a] = int(val)
print(sum(mem.values()))
if __name__ == "__main__":
main()
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