leetcode 67. Add Binary （高精度加法）

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

For example,
a = "11"
b = "1"
Return "100".

简单的二进制高精度加法。

class Solution {
public:
    string addBinary(string a, string b) {
        string ans="";
        int c=,i=a.length()-,j=b.length()-;
        while(i>=||j>=||c>)
        {
            c+= i>=? a[i--]-'':;
            c+= j>=? b[j--]-'':;
            ans=char(c%+'') + ans;
            c/=;
        }
        return ans;
    }
};