using System;

public class Program

{

    public static void Main()

    {

        int[] arr1={5,9,20};

        int[] arr2={3,12,15};

        //Given two sorted arrays arr1[] and arr2[] of sizes n and m in non-decreasing order. 

        //Merge them in sorted order without using any extra space.

        //Modify arr1 so that it contains the first N elements and modify arr2 so that it contains the last M elements.

    }

}