using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int[] arr = {3,4,3,2,10,1,9};

        int min = 0;

        int max = 0;

​

        for(int i = 0; i < arr.Length; i++)

        {

            if(arr[max] < arr[i])

                max = i;

            if(arr[min] > arr[i])

                min = i;

        }

        int temp = arr[min];

        arr[min] = arr[max];

        arr[max] = temp;

        foreach(int m in arr)

        {

            Console.WriteLine(m);

        }

    }

}