StudyPyTest/Q67 at master · CzKerwin/StudyPyTest · GitHub

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class Solution:#1
    def addBinary(self, a, b):
        """
        :type a: str
        :type b: str
        :rtype: str
        """
        grow=0
        answer=''
        lena,lenb=len(a),len(b)
        if lena<lenb:
            b,a=a,b
            lena,lenb=lenb,lena
        for i in range(lenb):
            num=int(a[-1-i])+int(b[-1-i])+grow
            if num == 2:
                num,grow=0,1
            elif num==3:
                num,grow=1,1
            else:
                grow=0
            answer=answer+str(num)
        for i in range(lenb,lena):
            num=int(a[-1-i])+grow
            if num == 2:
                num,grow=0,1
            elif num==3:
                num,grow=1,1
            else:
                grow=0
            answer=answer+str(num)
        if grow==1:
            answer=answer+str(1)
        return answer[::-1]

class Solution:#solution
    def addBinary(self, a, b):
        """
        :type a: str
        :type b: str
        :rtype: str
        """
        a = int(a,2);
        b = int(b,2);
        return str(bin(a+b))[2:];