02. Party

package Lists;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.function.DoubleToIntFunction;

public class Party_02 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int countCommands = Integer.parseInt(scanner.nextLine());
        List<String> guests = new ArrayList<>(); //празен списък за гостите
        for (int command = 1; command <= countCommands; command++) {
            String commandName = scanner.nextLine();
            String name = commandName.split(" ")[0];
            if (!commandName.contains("not")) {
                //•   "{name} is going!" -> split -> ["{name}", "is", "going!"]
                //ако не е в списъка
                if (!guests.contains(name)) {
                    guests.add(name);
                } else {
                    //ако е в списъка
                    System.out.println(name + " is already in the list!");
                }
            } else {
                //commandName.contains("not")
                //•   "{name} is not going!" -> split -> ["{name}", "is", "not", "going!"]
                //ако е в списъка -> махаме
                if (guests.contains(name)) {
                    guests.remove(name);
                } else {
                    //няма в списъка
                    System.out.println(name + " is not in the list!");
                }
            }
        }

        for (String guest : guests) {
            System.out.println(guest);
        }
    }
}