SoftUni Parking

package com.company;


import java.util.*;
import java.util.stream.Collectors;

public class Main {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());
        LinkedHashMap<String, String> registered = new LinkedHashMap<>();
        LinkedHashMap<String, String> allRegistered = new LinkedHashMap<>();

        for (int i = 0; i < n; i++) {
            String input = scanner.nextLine();
            String[] tokens = input.split(" +");
            String command = tokens[0];
            if (command.equals("register")) {

                String name = tokens[1];
                String number = tokens[2];

                if (!registered.containsKey(name)) {
                    registered.put(name, number);
                    allRegistered.put(name, number);

                    System.out.printf("%s registered %s successfully%n", name, number);


                } else {
                    String currentName = registered.get(name);

                    System.out.printf("ERROR: already registered with plate number %s%n", currentName);


                }

            } else if (command.equals("unregister")) {
                String name = tokens[1];

                if (!registered.containsKey(name)) {

                    System.out.printf("ERROR: user %s not found%n", name);


                } else {
                    String nameToremove = registered.get(name);
                    allRegistered.remove(name);

                    System.out.printf("%s unregistered successfully%n", name);

                }

            }
        }

        for (Map.Entry<String, String> entry : allRegistered.entrySet()) {

            System.out.printf("%s => %s%n", entry.getKey(), entry.getValue());
        }


    }

}