卡蒂斯（Kattis）-点点错误的答案

Question

我正在做Kattis测试（不同的编程挑战）。在使用示例数据时，我的代码有效。使用Kattis超级机密测试数据，我无法通过“错误答案”。没有给出更多信息。 Link to problem description

使用有限的错误数据，我很难找到我的错误。我在网上找到了一些行之有效的解决方案，但是如果我复制它们的全部代码，那一定会达到目的。

我的代码：

def exec():
    def CLEAR(a):
        register[31 - int(a)] = 0
        return register
    def SET(a):
        register[31 - int(a)] = 1
        return register
    def OR(a,b):
        x = register[31 - int(a)]
        y = register[31 - int(b)]
        if x == '?' or y == '?':
            register[31 - int(a)] = '?'
        elif x == 0 and y == 0:
            register[31 - int(a)] = 0
        else:
            register[31 - int(a)] = 1
        return register
    def AND(a,b):
        x = register[31 - int(a)]
        y = register[31 - int(b)]
        if x == '?' or y == '?':
            register[31 - int(a)] = '?'
        elif x == 1 and y == 1:
            register[31 - int(a)] = 1
        else:
            register[31 - int(a)] = 0
        return register

    def instruction(argument, *args):
        switcher = {
            'CLEAR': CLEAR,
            'SET': SET,
            'OR': OR,
            'AND': AND
        }
        func = switcher.get(argument)
        return func(*args)

    while True:
        lines = int(input()) #Get lines
        if lines == 0:
            break
        else:
            register = ['?'] * 32
            for x in range(lines): #loop through each line
                line = input().split()
                instruction(*line)
            print(*register, sep = "")
exec()