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- package Maps;
- import java.util.*;
- public class StudentAcademy_07 {
- public static void main(String[] args) {
- Scanner scanner = new Scanner(System.in);
- int countStudents = Integer.parseInt(scanner.nextLine());
- //студент -> списък с оценки
- Map<String, List<Double>> studentGrades = new LinkedHashMap<>();
- for (int i = 0; i < countStudents; i++) {
- String studentName = scanner.nextLine();
- double grade = Double.parseDouble(scanner.nextLine());
- //студентът да го нямаме в списъка
- if (!studentGrades.containsKey(studentName)) {
- studentGrades.put(studentName, new ArrayList<>());
- }
- studentGrades.get(studentName).add(grade);
- }
- //студент -> ср. оценка
- Map<String, Double> studentAverageGrade = new LinkedHashMap<>(); //студентите ср. оценка >= 4.50
- //търсим среданата оценка на всички студенти
- for (Map.Entry<String, List<Double>> entry : studentGrades.entrySet()) {
- //entry -> име (String) + списък с оценки (list<double>)
- String studentName = entry.getKey();
- List<Double> grades = entry.getValue();
- double averageGrade = getAverageGrade (grades);
- if(averageGrade >= 4.50) {
- studentAverageGrade.put(studentName, averageGrade);
- }
- }
- //разменяме записите ако на втория оценката > оценката на първия
- studentAverageGrade.entrySet()
- .forEach(entry -> System.out.printf("%s -> %.2f%n", entry.getKey(), entry.getValue()));
- }
- private static double getAverageGrade(List<Double> grades) {
- double sumGrades = 0;
- for (double grade : grades) {
- sumGrades += grade;
- }
- return sumGrades / grades.size();
- }
- }
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