using System;

//1

public class Program  

{

    public Program()  

    {

        Console.WriteLine(IsSorted(new int[] { 1, 2, 3, 4, 5 })); 

        Console.WriteLine(IsSorted(new int[] { 1, 3, 2, 4, 5 })); 

    }

    public bool IsSorted(int[] numbers)  

    {

        for (int i = 1; i < numbers.Length; i++) {

            if (numbers[i] < numbers[i - 1]){

                return false;

            }

        }

        return true;

    }

}

new Program();

​