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JavaPriorityQueue.java
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94 lines (80 loc) · 2.44 KB
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import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.*;
class StudentComparator implements Comparator<Student> {
public int compare(Student a, Student b) {
if (a.getCGPA() < b.getCGPA()){
return 1;
} else if (a.getCGPA() > b.getCGPA()) {
return -1;
} else {
int order = a.getName().compareTo(b.getName());
if (order < 0) {
return -1;
} else if (order > 0) {
return 1;
} else if (a.getID() < b.getID()) {
return -1;
}
}
return 1;
}
}
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 String getName() {
return this.name;
}
public int getID() {
return this.id;
}
public double getCGPA() {
return this.cgpa;
}
}
class Priorities {
public List<Student> getStudents(List<String> events) {
PriorityQueue<Student> students = new PriorityQueue<Student>(10, new StudentComparator());
for (String s : events) {
String[] words = s.split(" ");
if (words[0].equals("SERVED")){
students.poll();
} else {
students.add(new Student(Integer.parseInt(words[3]), words[1], Float.parseFloat(words[2])));
}
}
List<Student> result = new ArrayList<Student>();
while (!students.isEmpty()){
result.add(students.poll());
}
return result;
}
}
public class Solution {
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<Student> students = priorities.getStudents(events);
if (students.isEmpty()) {
System.out.println("EMPTY");
} else {
for (Student st: students) {
System.out.println(st.getName());
}
}
}
}