Задача: Детский утренник

GetSamePositionsByPermutation.cs

using System;
					
public class Program
{
	private static int GetSamePositionsByPermutation(int n, int m)
	{
		int[,] arr1 = new int[n, m];
		int[,] arr2 = new int[n, m];
		for (int i = 0; i < n; i++)
		{
			for (int j = 0; j < m; j++)
			{
				arr1[i, j] = i * m + j + 1;
				arr2[i, j] = j * n + i + 1;
			}
		}

		int count = 0;
		for (int i = 0; i < n; i++)
		{
			for (int j = 0; j < m; j++)
			{
				if (arr1[i, j] == arr2[i, j])
				{
					count++;
				}
			}
		}

		return count;
	}
	
	public static void Main()
	{
		Console.WriteLine("UniLecs");
		
		Console.WriteLine(string.Format("Answer = {0}", GetSamePositionsByPermutation(3, 3))); // 2
		Console.WriteLine(string.Format("Answer = {0}", GetSamePositionsByPermutation(3, 4))); // 3
	}
}