using System;

​

namespace ReverseMatrix

{

    public class Program

    {

        public static void Main(string[] args)

        {

            Console.WriteLine("Hello World!");

​

            int[,] matrix = new int[3, 3]

            {

                {1,2,3},

                {4,5,6},

                {7,8,9},

            };

​

            int[,] resultMatrix = new int[3, 3]

            {

                {1,4,7},

                {2,5,8},

                {3,6,9},

            };

​

            int[,] matrix2 = new int[4, 4]

            {

                { 1,  2,  3,  4},

                { 5,  6,  7,  8},

                { 9, 10, 11, 12},

                {13, 14, 15, 16},

            };

​

            int[,] resultMatrix2 = new int[4, 4]

            {

                { 1, 5, 9, 13},

                { 2, 6, 10, 14},

                { 3, 7, 11, 15},

                { 4, 8, 12, 16},

            };

​

            int[,] result1 = Reverse1(matrix);

            int[,] result2 = Reverse2(matrix);

​

            Console.WriteLine(Compare(resultMatrix, result1));

            Console.WriteLine(Compare(resultMatrix, result2));

​

            int[,] result21 = Reverse1(matrix2);

            int[,] result22 = Reverse1(matrix2);

​

            Console.WriteLine(Compare(resultMatrix2, result21));

            Console.WriteLine(Compare(resultMatrix2, result22));

​

            Console.WriteLine("Press ENTER to exit.");

            Console.ReadLine();

        }

​

        private static bool Compare(int[,] matrix1, int[,] matrix2)

        {

            int m = matrix1.GetUpperBound(0) + 1;

            int n = matrix1.GetUpperBound(1) + 1;

​

            for (int i = 0; i < m; i++)

            {

                for (int j = 0; j < n; j++)

                {

                    if (matrix1[i, j] != matrix2[i, j])

                        return false;

                }

            }

​

            return true;

        }

​

        private static int[,] Reverse1(int[,] matrix)

        {

            int m = matrix.GetUpperBound(0) + 1;

            int n = matrix.GetUpperBound(1) + 1;

​

            int[,] res = new int[n, m];

​

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

            {

                for (int j = 0; j < m; j++)

                {

                    res[i, j] = matrix[j, i];

                }

            }

​

            return res;

        }

​

        private static int[,] Reverse2(int[,] matrix)

        {

            int m = matrix.GetUpperBound(0) + 1;

            int n = matrix.GetUpperBound(1) + 1;

​

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

            {

                for (int j = 0; j <= i; j++)

                {

                    int tmp = matrix[i, j];

                    matrix[i, j] = matrix[j, i];

                    matrix[j, i] = tmp;

                }

            }

​

            return matrix;

        }

    }

}

​