using System;

namespace ConsoleApp21
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Random random = new Random();
            int[,] numbers = new int[10, 10];
            int maximumNumber = 9;
            int correction = 1;
            int numberSwap = 0;
            int greatestNumber = 0;

            for (int i = 0; i < numbers.GetLength(0); i++)
            {
                for (int j = 0; j < numbers.GetLength(1); j++)
                {
                    numbers[i, j] = random.Next(maximumNumber + correction);
                }
            }

            Console.WriteLine("Изначальная матрица :");

            for (int i = 0; i < numbers.GetLength(0); i++)
            {
                for (int j = 0; j < numbers.GetLength(1); j++)
                {
                    Console.Write(numbers[i, j] + " ");
                }

                Console.WriteLine();
            }

            for (int i = 0; i < numbers.GetLength(0); i++)
            {
                for (int j = 0; j < numbers.GetLength(1); j++)
                {
                    if (numbers[i, j] > greatestNumber)
                    {
                        greatestNumber = numbers[i, j];
                    }
                }
            }

            Console.WriteLine($"Нибольший элемент матрицы : {greatestNumber}");

            for (int i = 0; i < numbers.GetLength(0); i++)
            {
                for (int j = 0; j < numbers.GetLength(1); j++)
                {
                    if (numbers[i, j] == greatestNumber)
                    {
                        numbers[i, j] = numberSwap;
                    }
                }
            }

            Console.WriteLine("Полученная матрица :");

            for (int i = 0; i < numbers.GetLength(0); i++)
            {
                for (int j = 0; j < numbers.GetLength(1); j++)
                {
                    Console.Write(numbers[i, j] + " ");
                }

                Console.WriteLine();
            }
        }
    }
}