#include <bits/stdc++.h>
using namespace std;
class Solution
{
public:
    vector<int> getConcatenation(vector<int> &nums)
    {
        vector<int> ans;
        for (int i = 0; i < (nums.size()); i++)
        {
            ans.push_back(nums[i]);
        }
        for (int j = 0; j < (nums.size()); j++)
        {
            ans.push_back(nums[j]);
        }
        return ans;
    }
};
