C++ | Leetcode C++题解之第137题只出现一次的数字II

题目：

题解：

class Solution {
public:
    int singleNumber(vector& nums) {
        int a = 0, b = 0;
        for (int num: nums) {
            b = ~a & (b ^ num);
            a = ~b & (a ^ num);
        }
        return b;
    }
};