题解 | 无缓存交换

class Exchange {
public:
    vector<int> exchangeAB(vector<int> AB) {
        // write code here
        AB[0] = AB[0] ^ AB[1];
        AB[1] = AB[1] ^ AB[0];
        AB[0] = AB[0] ^ AB[1];
        return AB;
    }
};