GFG_Daily_Problem/Add Binary Strings.cpp at main · joyrocks93/GFG_Daily_Problem · GitHub

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 class Solution{
public:
	string addBinary(string A, string B)
	{
            string ans = "";
	    int i = A.size() - 1, j = B.size() - 1;
	    bool carry = 0;


	    while(i >= 0 || j >= 0)
	    {
	        int sum = 0;
	        if(i >= 0 && A[i] == '1')
	            sum++;
            if(j >= 0 && B[j] == '1')
                sum++;


            if(sum + carry == 3)
            {
                ans += '1';
                carry = 1;
            }
            else if(sum + carry == 2)
            {
                ans += '0';
                carry = 1;
            }
            else if(sum + carry == 1)
            {
                ans += '1';
                carry = 0;
            }
            else
            {
                ans += '0';
                carry = 0;
            }
            i--; j--;

	    }
	    if(carry == 1)
	        ans += to_string(carry);
	    reverse(ans.begin(), ans.end());
	    i = 0;
	    while(ans[i] == '0')
	    {
	        ans.erase(0, 1);
	    }
	    return ans;
	}
};