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JavaPriorityQueue.java
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JavaPriorityQueue.java
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package DataStructure;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.Comparator;
import java.util.PriorityQueue;
class Student3 {
final private int id;
final private String name;
final private double cgpa;
public Student3(int id, String name, double cgpa) {
super();
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 Checker3 implements Comparator<Student3> {
@Override
public int compare(Student3 s1, Student3 s2) {
if (s1.getCGPA() < s2.getCGPA()) {
return 1;
}
if (s1.getCGPA() == s2.getCGPA()) {
int comp = s1.getName().compareTo(s2.getName());
if (comp == 0) {
return s1.getID() > s2.getID() ? 1 : -1;
}
return comp;
}
return -1;
}
}
class Priorities {
public List<Student3> getStudents(List<String> events) {
PriorityQueue<Student3> queue = new PriorityQueue<>(new Checker3());
for (String s : events) {
if ("SERVED".equals(s)) {
queue.poll();
} else {
String[] parts = s.split(" ");
queue.add(new Student3(
Integer.parseInt(parts[3]),
parts[1],
Double.parseDouble(parts[2])
));
}
}
List<Student3> students = new ArrayList<>();
while (!queue.isEmpty()) {
students.add(queue.poll());
}
return students;
}
}
public class JavaPriorityQueue {
private final static Scanner scan = new Scanner(System.in);
private final static Priorities priorities = new Priorities();
public static void main(String[] args) {
int totalEvents = Integer.parseInt(scan.nextLine());
List<String> events = new ArrayList<>();
while (totalEvents-- != 0) {
String event = scan.nextLine();
events.add(event);
}
List<Student3> students = priorities.getStudents(events);
if (students.isEmpty()) {
System.out.println("EMPTY");
} else {
for (Student3 st : students) {
System.out.println(st.getName());
}
}
}
}