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- import java.util.ArrayList;
- import java.util.List;
- import java.util.Scanner;
- public class ListHouseParty {
- public static void main(String[] args) {
- Scanner scanner = new Scanner(System.in);
- List<String> guestList = new ArrayList<>();
- int n = Integer.parseInt(scanner.nextLine());
- for (int i = 0; i < n ; i++) {
- String[] tokens = scanner.nextLine().split("\\s+", 2);
- String name = tokens[0];
- if(tokens[1].equals("is going")){
- if(guestList.contains(name)){
- System.out.println(String.format("%s is already in the list",name));
- }else {
- guestList.add(name);
- }
- }else {
- if(guestList.contains(name)){
- guestList.remove(name);
- }else{
- System.out.println(String.format("%s is not in the list!",name));
- }
- }
- }
- for(String guest : guestList){
- System.out.println(guest);
- }
- }
- }
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