2019 카카오 오픈채팅

	package KAKAO;
	import java.util.*;
	public class Openchat {
	public static void main(String[] args) {
	String[] record = {"Enter uid1234 Muzi","Enter uid4567 Prodo","Leave uid1234","Enter uid1234 Prodo","Change uid4567 Ryan"};
	for(String val : solution(record)) {
	System.out.println(val);
	}
	}
	public static String[] solution(String[] record) {
	List<String> list = new ArrayList<String>();
	Map<String, String> map = new HashMap<String, String>();
	for(String str : record){
	StringTokenizer tokenizer = new StringTokenizer(str);
	String cmd = tokenizer.nextToken();
	if(cmd.equals("Enter") || cmd.equals("Change")){
	String id = tokenizer.nextToken();
	String name = tokenizer.nextToken();
	map.put(id, name);
	}
	}
	for(String str : record){
	StringTokenizer tokenizer = new StringTokenizer(str);
	String cmd = tokenizer.nextToken();
	if(cmd.equals("Enter")){
	String id = tokenizer.nextToken();
	list.add(map.get(id) + "in..");
	}else if(cmd.equals("Leave")){
	String id = tokenizer.nextToken();
	list.add(map.get(id)+ "out.");
	}
	}
	String[] answer = new String[list.size()];
	list.toArray(answer);
	return answer;
	}
	}

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