https://2ch.hk/pr/res/1482351.html#1498939, C#

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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;
using System.Text;

namespace Rextester
{
    public class Program
    {
        
        // Generate a random number between two numbers  
        public static Random random = new Random();
        
        public static int[] Exchange(int[] arr){
            Console.WriteLine("Start Exchange: arr = "+string.Join(",", arr));
            int maxValue = arr.Max();
            Console.WriteLine("Max value"+maxValue);
            int index = Array.IndexOf(arr, maxValue);
            Console.WriteLine("Index of element with max value: "+index);
            
            //XOR-exchange
            arr[0] = arr[0] ^ arr[index];
            arr[index] = arr[0] ^ arr[index];
            arr[0] = arr[0] ^ arr[index];
            
            Console.WriteLine("End Exchange: arr = "+string.Join(",", arr));
            return arr;
        }
        
        public static int[] AddToConsoleArray(int length)
        { 
            int[] arr = new int[length];

//            Console.WriteLine("Type any numbers and press Enter.");
            for(int i = 0; i <length; i++)
            {
//                arr[i] = int.Parse(Console.ReadLine());
                arr[i] = random.Next(0, 9);
            }
            
            arr = Exchange(arr);
            return arr;
        }
        
        public static int x = 10;
        
        public static void Main(string[] args)
        {
            //Your code goes here
            
            Console.WriteLine("AddToConsoleArray: "+string.Join(",", AddToConsoleArray(x)));
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,17 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 14 Mb, average nr of threads: 3, absolute service time: 0,31 sec