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- 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());
- List<String> names = new ArrayList<>();
- for (int i = 0; i < n; i++) {
- String[] tokens = scanner.nextLine().split("\\s+");
- if (tokens.length == 3) {
- if (!names.contains(tokens[0])) {
- names.add(tokens[0]);
- } else {
- System.out.println(String.format("%s is already in the list!", tokens[0]));
- }
- } else if (tokens.length == 4) {
- if (!names.contains(tokens[0])) {
- System.out.println(String.format("%s is not in the list!", tokens[0]));
- }
- names.remove(tokens[0]);
- }
- }
- names.forEach(System.out::println);
- }
- }
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