I don't know if I'm the only one who's having this issue, but I can't import the "PriorityQueue" class:

PriorityQueue cannot be resolved to a typeJava(16777218)

A Java PriorityQueue is a data structure from the Java Collections Framework that functions like a regular queue but orders its elements based on priority rather than insertion order. Winbuzz Sign Up

`class Student{ private int id; private String name; private double cgpa;

public Student (int id, String name, double cgpa){
    this.id = id;
    this.name = name;
    this.cgpa = cgpa;
}
public int getID(){
    return id;
}
public String getName(){
    return name;
}
public double getCGPA(){
    return cgpa;
}

}`

`class Priorities{ public List getStudents(List events){ PriorityQueue queue = new PriorityQueue<>( new Comparator() { public int compare(Student stu1, Student stu2){ if(stu1.getCGPA()!= stu2.getCGPA()){ return Double.compare(stu2.getCGPA(), stu1.getCGPA()); }else if (!stu1.getName().equals(stu2.getName())){ return stu1.getName().compareTo(stu2.getName()); }else { return stu1.getID() - stu2.getID(); } } } );

    for (String e : events){
        String[] part = e.split(" ");
        if(part[0].equals("ENTER")){
            String name = part[1];
            double cgpa = Double.parseDouble(part[2]);
            int id = Integer.parseInt(part[3]);
            queue.add(new Student(id, name, cgpa));
        }else if (part[0].equals("SERVED")){
            queue.poll();
        }
    }

    List<Student> result = new ArrayList<>();
    while (!queue.isEmpty()){
        result.add(queue.poll());
    }
    return result;
}

}`

`public class Solution {

public static void main(String[] args) {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    Scanner input = new Scanner(System.in);
    int n = Integer.parseInt(input.nextLine());

    List<String> events = new ArrayList<>();
    while (n-- > 0){
        events.add(input.nextLine());
    }

    Priorities priorities = new Priorities();
    List<Student> students = priorities.getStudents(events);

    if(students.isEmpty()){
        System.out.println("EMPTY");
    }else {
        for (Student s : students){
            System.out.println(s.getName());
        }
    }
}

}`

PriorityQueue is excellent when you need a dynamically sized structure that retrieves elements based on priority efficiently. But for use cases needing sorted iteration or random access, alternatives like TreeSet or ArrayList + sorting should be considered. 11xplay ID

public class Solution {

private final static Scanner sc = new Scanner(System.in);
private final static Priorities priorities = new Priorities();

public static void main(String[] args) {

   int totalEventos = Integer.parseInt(sc.nextLine().trim());
   List<String> events = new ArrayList<>();

   for (int i=0; i < totalEventos; i++){
    events.add(sc.nextLine().trim());
   }

    List<Student> students = priorities.getStudents(events);

    if (students.isEmpty()) {
            System.out.println("EMPTY");
    } else {
        for (Student s : students) {
            System.out.println(s.getName());
        }
    }
   sc.close();
}

static class Student {
    private int id;
    private String name;
    private double CGPA;

    public Student(int id, String name, double CGPA) {
            this.id = id;
            this.name = name;
            this.CGPA = CGPA;
    }

    public int getID() {
            return id;
    }
    public String getName(){
            return name;
    }
    public double getCGPA(){
            return CGPA;
    }
}

static class Priorities {

    public List<Student> getStudents(List<String> events){
        PriorityQueue<Student> fila = new PriorityQueue<>(
                Comparator.comparing(Student::getCGPA).reversed()
                .thenComparing(Student::getName)
                .thenComparing(Student::getID)
        );

        for(String enter : events) {
            String[] result = enter.split(" ");

            if(result[0].equalsIgnoreCase("ENTER")){
                    fila.add(new Student(Integer.parseInt(result[3]), 
                    result[1], 
                    Double.parseDouble(result[2])
                    ));
            } else if (result[0].equals("SERVED")) {
                    fila.poll();
            }
        }

        List<Student> restantes = new ArrayList<>();
        while(!fila.isEmpty()) {
                restantes.add(fila.poll());
        }
        return restantes;
    }

}

}