Ex07_StudentsAcademy

import java.util.*;

public class Ex07_StudentsAcademy {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        Map<String, List<Double>> studentsGrades = new LinkedHashMap<>();

        int countStudents = Integer.parseInt(scanner.nextLine());

        for (int i = 0; i < countStudents; i++) {
            String studentName = scanner.next();
            double score = scanner.nextDouble();

            studentsGrades.putIfAbsent(studentName, new ArrayList<>());
            studentsGrades.get(studentName).add(score);

        }

        Map<String, Double> toPrint = new LinkedHashMap<>();
        studentsGrades
                .entrySet()
                .forEach(student -> {

                   double  result = student.getValue().stream().mapToDouble(Double::doubleValue).average().getAsDouble();
                    if ( result >=4.5){
                    toPrint.put(student.getKey(),result);
                    }
                });
        toPrint
                .entrySet()
                .stream()
                .sorted((f, s) -> Double.compare(s.getValue(),f.getValue()))
                .forEach(student -> System.out.println(String.format("%s -> %.2f",student.getKey(), student.getValue())));


       /* studentsGrades.
                entrySet()
                .stream()
                .filter(student -> student.getValue()
                        .stream()
                        .mapToDouble(Double::doubleValue)
                        .average().getAsDouble() >= 4.5)
                .sorted((student1, student2) -> {
                    double first = student1.getValue().stream().mapToDouble(Double::doubleValue).average().getAsDouble();
                    double second = student2.getValue().stream().mapToDouble(Double::doubleValue).average().getAsDouble();
                    return Double.compare(second, first);
                })
                .forEach(student -> System.out.println(String.format("%s -> %.2f",
                        student.getKey(),
                        student.getValue().stream().mapToDouble(Double::doubleValue).average().getAsDouble()
                )));
*/
    }
}