One line Python solution! 39ms


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    K
    class Solution(object):
        def addBinary(self, a, b):
            """
            :type a: str
            :type b: str
            :rtype: str
            """
            return '0' if len(set(a))>2 or len(set(b))>2 else bin(int('0b'+a,2)+int('0b'+b,2))[2:]
    

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