371. Sum of Two Integers（位运算）

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

Example:
Given a = 1 and b = 2, return 3.

Credits:
Special thanks to @fujiaozhu for adding this problem and creating all test cases.

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题解：

求两个数的和，不能用加减法。显然是位运算。ac代码：

class Solution {
public:
    int getSum(int a, int b) {
        return a & b ? getSum((a & b) << 1, a ^ b) : a | b;
    }
};