#include<iostream>
#include<vector>
using namespace std;
int singleNumber(vector<int> & nums)
{
int res = 0;
for (auto &i : nums)
{
res ^= i;
}
return res;
}
int main()
{
int nums[11] = { 1, 5, 6, 3, 5, 2, 1, 8, 6, 3, 8 };
vector<int> v;
v.insert(v.begin(), nums, nums + 11);
cout << singleNumber(v);
system("pause");
return 0;
}