import java.util.*;

public class Program2 {

  public record Element(
      int weight) implements Comparable {

    public int compareTo(Object o) {

      if (!(o instanceof Element)) {
        throw new IllegalArgumentException("Got invalid class to compare: " + o.getClass());
      }

      Element e = (Element)o;

      return weight - e.weight;
    }

    public String toString() {
      return "Element{weight = %d}".formatted(weight);
    }
  }

  public static void main(String[] args) {

    var pq = new PriorityQueue<Element>();
    pq.add(new Element(1));
    pq.add(new Element(5));
    pq.add(new Element(-3));
    pq.add(new Element(-7));

    System.out.printf("Hello World: %s\n", pq.remove());
    System.out.printf("Hello World: %s\n", pq.remove());
    System.out.printf("Hello World: %s\n", pq.remove());
    System.out.printf("Hello World: %s\n", pq.remove());
  }

}