PlantDiscovery2

package Advance.Exams.FinalExams;


import java.util.*;

public class DestinationMapper2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());
        LinkedHashMap<String, List<Double>> plantsMap = new LinkedHashMap<>();
        for (int i = 1; i <= n; i++) {
            String[] inputArr = scanner.nextLine().split("<->");
            String name = inputArr[0];
            double rarity = Double.parseDouble(inputArr[1]);
            if (plantsMap.containsKey(name)) {
                plantsMap.get(name).set(0, rarity);
            } else {
                plantsMap.put(name, new ArrayList<>());
                plantsMap.get(name).add(0, rarity);
                plantsMap.get(name).add(1, 0.0);
            }
        }

        String command = scanner.nextLine();
        while (!command.equals("Exhibition")) {
            String[] commandArr = command.split(":\\s+|\\s+-\\s+");
            String currentCommand = commandArr[0];
            String name = commandArr[1];

            if (plantsMap.containsKey(name)) {

                if (currentCommand.equals("Rate")) {
                    double oldRate = plantsMap.get(name).get(1);
                    double newRate = Double.parseDouble(commandArr[2]);
                    plantsMap.get(name).set(1, newRate + oldRate);
                    if (plantsMap.get(name).size() <= 2) {
                        plantsMap.get(name).add(2, 1.0);
                    } else {
                        double oldCount = plantsMap.get(name).get(2);
                        plantsMap.get(name).set(2, oldCount + 1);
                    }

                } else if (currentCommand.equals("Update")) {
                    double newRarity = Double.parseDouble(commandArr[2]);
                    plantsMap.get(name).set(0, newRarity);

                } else if (currentCommand.equals("Reset")) {
                    plantsMap.get(name).set(1, 0.0);

                }

            } else {
                System.out.println("error");
            }

            command = scanner.nextLine();
        }

        System.out.println("Plants for the exhibition:");
        for (Map.Entry<String, List<Double>> item : plantsMap.entrySet()) {
            double average = item.getValue().get(1) / item.getValue().get(2);
            System.out.printf("- %s; Rarity: %.0f; Rating: %.2f%n", item.getKey(), item.getValue().get(0), average);
        }

    }
}