public static void main(String[] args)
    {
        int[] a = new int[]{1,4,3,9,5,7,10,30,20,11};
        DivideAndConquerSort ds = new DivideAndConquerSort();
        ds.mergeSort(a, 0, a.length-1);
        for (int i = 0; i < a.length; i++)
        {
            System.out.println(a[i]);
        }
    }