FindMinMax, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program//https://otvet.mail.ru/question/211105850
    {
        static int[,] CreateMatrix(int n)
        {
            int[,] arr = new int[n, n];
            Random rnd = new Random();
            for (int i = 0; i < n * n; i++) arr[i / n, i % n] = (rnd.Next(0, 10));
            return arr;
        }
        static bool FindMinMax(int[,] arr, out int min, out int max)
        {
            min = arr[0, 0];
            max = arr[0, 0];
            for (int j = 0; j < arr.GetUpperBound(1); j++)
                for (int i = 0; i < arr.GetUpperBound(0) - j; i++)
                {
                    if (min > arr[i, j]) min = arr[i, j];
                    if (max < arr[i, j]) max = arr[i, j];
                }
            return true;
        }
        static void PrintMatrix(int[,] arr)
        {
            for (int j = 0; j <= arr.GetUpperBound(1); j++)
            {
                for (int i = 0; i <= arr.GetUpperBound(0); i++)
                    Console.Write("{0} ", arr[i, j]);
                Console.WriteLine();
            }
        }

public static void Main(string[] args)
        {
            int n = 5;
            int[,] a = CreateMatrix(n);
            int min, max;
            FindMinMax(a, out min, out max);
            PrintMatrix(a);
            Console.WriteLine("min = {0} max = {1}", min, max);
            //Console.ReadKey();
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,11 sec, cpu time: 0,09 sec, average memory usage: 13 Mb, average nr of threads: 2