Задача: Double Reverse

DoubleReverse.cs

using System;
using System.Linq;
					
public class Program
{
	public static void DoubleReverse(ref int[] arr, int ind_1, int ind_2, int ind_3, int ind_4)
	{
		while (ind_1 < ind_2)
		{
			int temp = arr[ind_1];
			arr[ind_1] = arr[ind_2];
			arr[ind_2] = temp;

			ind_1++;
			ind_2--;
		}

		while (ind_3 < ind_4)
		{
			int temp = arr[ind_3];
			arr[ind_3] = arr[ind_4];
			arr[ind_4] = temp;

			ind_3++;
			ind_4--;
		}
	}
	
	public static void Main()
	{
		Console.WriteLine("UniLecs");
		
		int n = 9;
		int[] arr = Enumerable.Range(1, n).ToArray();
		DoubleReverse(ref arr, 1, 4, 5, 8);
		Console.WriteLine(string.Format("Answer = {0}", string.Join(" ", arr)));		
	}
}