leetcode Add Binary

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

For example,
a = "11"
b = "1"

Return "100".

思路：反转在逐位加，在反

#include <vector>
#include <string>
#include <algorithm>
#include <iostream>

using std::vector;
using std::string;
using std::cout;


class Solution {
    string addbinary(string &less,string &b)
    {
		string temp;
        if (less.size() > b.size())
            swap(less,b);
        
        char c = 0;//进位
        char n;
        size_t len = b.size();
        size_t less_len = less.size();
        for (int i =0;i!=len;++i){
            if (i < less_len){
				if ((less[i] + b[i] + c -48) >= '2'){
					temp.push_back((less[i] + b[i] + c -48) - 2);
					c = 1;
				}else{
					temp.push_back((less[i] + b[i] +c - 48));
					c = 0;
				}
            }else{
				temp.push_back(b[i]+c -48 == 2?48:b[i]+c);
                c = b[i] + c -48 == 2?1:0;
            }
        }

		if (c == 1){
			temp.push_back(49);
		}
		return temp;
    }
public:
    string addBinary(string a, string b) {
        string temp;
        reverse(a.begin(),a.end());
        reverse(b.begin(),b.end());
        temp = addbinary(a,b);
        reverse(temp.begin(),temp.end());
        return temp;
    }
};

int main()
{
	Solution sol;
	cout << sol.addBinary("11","11");
}