using System;

public class Program

{

    public static void Main()

    {

        Console.Write("Nhap vao so dong: ");

            int d = Convert.ToInt32(Console.ReadLine());

            Console.Write("Nhap vao so cot: ");

            int c = Convert.ToInt32(Console.ReadLine());

            int[,] matrix = new int[d, c];

            for (int i = 0; i < matrix.GetLength(0); i++)

            {

                for (int j = 0; j < matrix.GetLength(1); j++)

                {

                    Console.Write("Phan tu thu [{0},{1}]: ", i, j);

                    matrix[i, j] = Convert.ToInt32(Console.ReadLine());

                }

            }

​

            for (int i = 0; i < matrix.GetLength(0); i++)

            {

                for (int j = 0; j < matrix.GetLength(1); j++)

                {

                    Console.Write("{0,4}", matrix[i, j]);

                }

                Console.WriteLine();

            }

            int tmp = 0;

            int b = 0;

            while (b < matrix.GetLength(0))

            {

                for (int i = 0; i < matrix.GetLength(0); i++)

                {

                    for (int t = i + 1; t < matrix.GetLength(0); t++)

                    {

                        if (matrix[i, b] > matrix[t, b])

                        {

                            tmp = matrix[i, b];

                            matrix[i, b] = matrix[t, b];

                            matrix[t, b] = tmp;

                        }

                    }

                }

                b++;

            }

            Console.WriteLine("--------loading-------");

            for (int i = 0; i < matrix.GetLength(0); i++)

            {

                for (int j = 0; j < matrix.GetLength(1); j++)

                {

                    Console.Write("{0,4}", matrix[i, j]);

                }

                Console.WriteLine();

            }

    }

}