Leetcode Problem.67—Add Binary

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Given two binary strings, return their sum (also a binary string).

For example,
a = "11"
b = "1"

Return "100".

My C++ solution！

string addBinary(string a, string b)     {        int len_a=a.length();int len_b=b.length();string result;int temp;int jinwei=0;int i=0,j=0;while(len_a||len_b){temp=0;int r;if(len_a){temp=temp+a[len_a-1]-'0';len_a--;}if(len_b){temp=temp+b[len_b-1]-'0';len_b--;}temp=temp+jinwei;result=result.insert(0,1,temp%2+'0');jinwei=temp/2;}if(jinwei==1)result.insert(0,1,'1');return result;    }

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