using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {

            int n = 10, maxValue = 0, toChangeX = 0, toChangeY = 0;
            int[,] matrix1 = new int[n, n];
            Random rand = new Random();

            for (int i = 0; i < matrix1.GetLength(0); i++)
            {
                for (int j = 0; j < matrix1.GetLength(1); j++)
                {
                    matrix1[i, j] = rand.Next(10, 100);
                    Console.Write(matrix1[i, j] + " ");
                    if (maxValue < matrix1[i, j])
                    {
                        maxValue = matrix1[i, j];
                        toChangeX = j;
                        toChangeY = i;
                    }
                }
                Console.WriteLine();
            }
            Console.WriteLine();
            Console.WriteLine();

            Console.WriteLine("Максимальное значение: " + maxValue);
            matrix1[toChangeY, toChangeX] = 0;
            Console.WriteLine();

            for (int i = 0; i < matrix1.GetLength(0); i++)
            {
                for (int j = 0; j < matrix1.GetLength(1); j++)
                {
                    Console.Write(matrix1[i, j] + " ");
                }
                Console.WriteLine();
            }

            Console.ReadKey();

        }
    }
}