public static boolean isSubset(List<Integer> parent,List<Integer> children) {
List<Integer> parent_1 = new ArrayList<>();
parent_1.addAll(parent);
List<Integer> children_1 = new ArrayList<>();
children_1.addAll(children);
int differ = parent_1.size() - children_1.size();
parent_1.removeAll(children_1);
if(differ > 0 && differ == parent_1.size()) {
return true;
}else {
return false;
}
}