LeetCode371. Sum of Two Integers

一、题目

Given two integers a and b, return the sum of the two integers without using the operators + and -.

Example 1:

Input: a = 1, b = 2
Output: 3
Example 2:

Input: a = 2, b = 3
Output: 5

Constraints:

-1000 <= a, b <= 1000

二、题解

class Solution {
public:
    int getSum(int a, int b) {
        int res = a;
        while(b != 0){
            res = a ^ b;
            b = (a & b) << 1;
            a = res;
        }
        return res;
    }
};