[백준] 7785 회사에 있는 사람 (실버5)

https://www.acmicpc.net/problem/7785

import java.io.*;
import java.util.*;
public class Main {
    static int n;
    public static void main(String[] args) throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        n = Integer.parseInt(br.readLine());
        HashSet<String> log = new HashSet<>();

        for(int i=0;i<n;i++){
            StringTokenizer st = new StringTokenizer(br.readLine());
            String name = st.nextToken();
            String msg = st.nextToken();
            if(msg.equals("enter")){
                log.add(name);
            } else if(msg.equals("leave")){
                log.remove(name);
            }
        }

        for(String l : log){
            System.out.println(l);
        }
    }
}

=> 정렬을 빼먹어서 추가

import java.io.*;
import java.util.*;
public class Main {
    static int n;
    public static void main(String[] args) throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        n = Integer.parseInt(br.readLine());
        HashSet<String> log = new HashSet<>();

        for(int i=0;i<n;i++){
            StringTokenizer st = new StringTokenizer(br.readLine());
            String name = st.nextToken();
            String msg = st.nextToken();
            if(msg.equals("enter")){
                log.add(name);
            } else if(msg.equals("leave")){
                log.remove(name);
            }
        }

        String[] ans = new String [log.size()];
        int idx = 0;
        for(String l : log){
            ans[idx++] = l;
        }
        Arrays.sort(ans, Collections.reverseOrder());

        for(int i=0;i<ans.length;i++){
            System.out.println(ans[i]);
        }
    }
}