using System;

using System.Linq;

using System.Collections.Generic;

/*

Given the array nums consisting of 2n elements in the form [x1,x2,...,xn,y1,y2,...,yn].

​

Return the array in the form [x1,y1,x2,y2,...,xn,yn].

​

Example:

​

Input: nums = [2,5,1,3,4,7], n = 3

Output: [2,3,5,4,1,7] 

Explanation: Since x1=2, x2=5, x3=1, y1=3, y2=4, y3=7 then the answer is [2,3,5,4,1,7].

*/

​

public static class Program

{

    public static int[] Shuffle(int[] nums, int n) {

        int[] xCoords= nums.Take(n).ToArray();

        int[] yCoords = nums.Skip(n).ToArray();

        List<int> points = new List<int> ();

        for(int i=0;i<n;i++){

            points.Add(xCoords[i]);

            points.Add(yCoords[i]);

        }

        return points.ToArray();

    }

    public static void Main()

    {

        int[] test= {2,5,1,3,4,7};

        int[] result= Shuffle(test, 3);

        String csvResult = String.Concat(result,",");

        Console.Write(csvResult);

    }

}