371. Sum of Two Integers

371. Sum of Two Integers (Easy)

Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.

Example 1:

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

Example 2:

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

Companies:
Facebook

Related Topics:
Bit Manipulation

Similar Questions:

• Add Two Numbers (Medium)

Solution 1.

// OJ: https://leetcode.com/problems/sum-of-two-integers/
// Author: github.com/lzl124631x
// Time: O(1)
// Space: O(1)
class Solution {
public:
    int getSum(int a, int b) {
        while (b) {
            int carry = (a & b) << 1;
            a ^= b;
            b = carry;
        }
        return a;
    }
};