题目描述

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

The input strings are both non-empty and contains only characters 1 or 0.

Example 1:

Input: a = "11", b = "1"
Output: "100"

Example 2:

Input: a = "1010", b = "1011"
Output: "10101"

题目思路

• 思路一、看高赞得到的答案，真是清晰易懂啊

class Solution {
public:
    string addBinary(string a, string b) {
        string result = "";
        
        int i = a.size() - 1;
        int j = b.size() - 1;
        int sum = 0;
        
        while(i >= 0 || j >= 0){
            if(i >= 0)  sum += a[i--] - '0';
            
            if(j >= 0)  sum += b[j--] - '0';
            
            result.insert(0, to_string(sum%2));
            sum /= 2;
        }
        
        if(sum)  result.insert(0, "1");
        
        return result;
    }
};

总结展望