Leetcode.Solved.Concatenation-of-array

// https://leetcode.com/problems/concatenation-of-array/
public class Solution {
    public int[] GetConcatenation(int[] nums) {
        int[] res = new int[2 * nums.Length];
        for (int i = 0 ; i < nums.Length; i++) {
          res[i] = nums[i];
          res[i + nums.Length] = nums[i];
        }        

        return res;
    }
}