using System;

    class MatrixPrint
    {
        static void Main()
        {
            Console.Write("Enter the size of the matrix: ");
            int n = int.Parse(Console.ReadLine());
            int[,] matrix = new int[n, n];
            int num = 1;

            Console.WriteLine();
            Console.WriteLine("First variant: ");
            for (int col = 0; col < n; col++)
            {
                for (int row = 0; row < n; row++)
                {
                    matrix[row, col] = num;
                    num++;
                }
            }

            for (int row = 0; row < n; row++)
            {
                for (int col = 0; col < n; col++)
                {
                    Console.Write("{0,3}", matrix[row, col]);
                }
                Console.WriteLine();
            }
            Console.WriteLine();

            num = 1;
            Console.WriteLine("Second variant: ");
            for (int col = 0; col < n; col++)
            {
                if (col % 2 == 0)
                {
                    for (int row = 0; row < n; row++)
                    {
                        matrix[row, col] = num;
                        num++;
                    }
                }
                else
                {
                    for (int row = n - 1; row >= 0; row--)
                    {
                        matrix[row, col] = num;
                        num++;
                    }
                }
            }

            for (int row = 0; row < n; row++)
            {
                for (int col = 0; col < n; col++)
                {
                    Console.Write("{0,3}", matrix[row, col]);
                }
                Console.WriteLine();
            }
            Console.WriteLine();

            num = 1;
            Console.WriteLine();
            Console.WriteLine("Third variant: ");
            for (int row = 0; row <= n - 1; row++)
            {
                for (int col = 0; col <= row; col++)
                {
                    matrix[n - row + col - 1, col] = num;
                    num++;
                }
            }

            for (int row = n - 2; row >= 0; row--)
            {
                for (int col = row; col >= 0; col--)
                {
                    matrix[row - col, n - col - 1] = num;
                    num++;
                }
            }

            for (int row = 0; row < n; row++)
            {
                for (int col = 0; col < n; col++)
                {
                    Console.Write("{0,3}", matrix[row, col]);
                }
                Console.WriteLine();
            }
            Console.WriteLine();

            num = 1;
            int end=n;
            int start=0;
            Console.WriteLine();
            Console.WriteLine("Fourth variant:");
            do
            {
                for (int row = start; row < end; row++)
                {
                    matrix[row, start] = num;
                    num++;
                }

                for (int col = start + 1; col < end; col++)
                {
                    matrix[end-1, col] = num;
                    num++;
                }

                for (int row = end - 2; row >= start; row--)
                {
                    matrix[row, end - 1] = num;
                    num++;
                }

                for (int col = end - 2; col >= start + 1; col--)
                {
                    matrix[start, col] = num;
                    num++;
                }
                start++;
                end--;
            }
            while (end - start > 0);

            for (int row = 0; row < n; row++)
            {
                for (int col = 0; col < n; col++)
                {
                    Console.Write("{0,3}", matrix[row, col]);
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }
    }