public static List<Integer> jimOrders(List<List<Integer>> orders) {
  int n = orders.size();
  List<List<Integer>> delivery = new ArrayList<>();
  List<Integer> customers = new ArrayList<>();

  for (int i = 0; i < n; i++) {
    int orderNumber = orders.get(i).get(0);
    int prepTime = orders.get(i).get(1);
    int deliverytime = orderNumber + prepTime;
    delivery.add(Arrays.asList(i + 1, deliverytime));
  }
  Collections.sort(delivery, new Comparator<List<Integer>>() {
    @Override
    public int compare(List<Integer> o1, List<Integer> o2) {
      if (o1.get(1) != o2.get(1)) {
        return o1.get(1).compareTo(o2.get(1));
      } else {
        return o1.get(0).compareTo(o2.get(0));
      }
    }
  });
  for (List<Integer> l : delivery) {
    customers.add(l.get(0));
  }
  System.out.println(customers);
  return customers;
}