public static List<Integer> cutTheSticks(List<Integer> arr) {
    List<Integer> result = new ArrayList<>();
    result.add((int)arr.stream().filter(s -> s!=0).count());
    while(arr.stream().filter(a -> a!=0).count() != 0) {
        int minval = arr.stream().mapToInt(s -> s).filter(s -> s != 0).min().getAsInt();
        arr = arr.stream().map(val -> val != 0 ? val-minval : val).collect(Collectors.toList());
        int cnt = (int)arr.stream().filter(s -> s!=0).count();
        if(cnt != 0) result.add(cnt);
    }
    return result;
}