题目链接:https://leetcode-cn.com/problems/single-number/ 题目如下:
class Solution { public: int singleNumber(vector<int>& nums) { //使用异或运算,其中有个规则, //1、a^a^b=b,且异或满足交换律和结合律 //2、a^0=a //3、a^a=0 int ans=0; for(auto e:nums) ans^=e; return ans; } };