34 lines
1.0 KiB
Python
34 lines
1.0 KiB
Python
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def getInstructions(filename):
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with open(filename, "r") as f:
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return list(line.split(" = ") for line in f.read().split("\n"))
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def decToBin(decimal):
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binary = bin(decimal)[2:]
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return "0"*(36 - len(binary)) + binary
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def applyMask(address, mask):
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return "".join(mask[i] if mask[i] in ["X", "1"] else address[i] for i in range(36))
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def writeToMemory(memory, address: str, value):
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numOfFloatingBits = address.count("X")
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for i in range(2**numOfFloatingBits):
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realAddress = address
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for j in range(numOfFloatingBits):
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realAddress = realAddress.replace("X", str((i & 2**j) >> j), 1)
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memory[int(realAddress, 2)] = value
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memory = {}
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currentMask = "X" * 36
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instructions = getInstructions("input.txt")
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for instruction in instructions:
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if instruction[0] == "mask":
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currentMask = instruction[1]
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else:
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address = int(instruction[0][4:-1])
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value = int(instruction[1])
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maskedAddress = applyMask(decToBin(address), currentMask)
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writeToMemory(memory, maskedAddress, value)
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memorySum = sum(memory.values())
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print(memorySum) |