public static void main(String[] args){
        System.out.println("Hello World");
        int[]s = {4,1,0};
        List<List<Integer>> result = new ArrayList<List<Integer>>();
        result = new Subsets().subsets(s);
        for(int i = 0 ; i< result.size();i++)
            System.out.println(Arrays.toString(result.get(i).toArray()));
    }