1. Вход и изход на матрица

using System;

namespace _1._MatrixInputOutput
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int rows = int.Parse(Console.ReadLine());
            int cols = int.Parse(Console.ReadLine());

            int[,] numbers = new int[rows, cols];

            //input matrix
            for (int row = 0; row <= rows - 1; row++)
            {
                for (int col = 0; col <= cols - 1; col++)
                {
                    numbers[row, col] = int.Parse(Console.ReadLine());
                }
            }

            //output matrix
            for (int row = 0; row <= rows - 1; row++)
            {
                for (int col = 0; col <= cols - 1; col++)
                {
                    Console.Write(numbers[row, col] + " ");
                }
                Console.WriteLine();
            }
        }
    }
}