Zig-Zag Arrays

using System;
using System.Linq;

public class Program
{
	public static void Main()
	{
		int n = int.Parse(Console.ReadLine());

		int [] arr1 = new int [n];
		int [] arr2 = new int [n];

		for (int i=0; i<n; i++)
		{
			int [] numbers = Console.ReadLine().Split().Select(int.Parse).ToArray();

			int num1 = numbers[0];
			int num2 = numbers[1];

			if (i%2==0)
			{
				arr1 [i] = num1;
				arr2[i] = num2;
			}
			else
			{
				arr1 [i] = num2;
				arr2[i] = num1;
			}
		}
		Console.WriteLine(string.Join(" ",arr1));
		Console.WriteLine(string.Join(" ",arr2));
	}
}