[프로그래머스/2019 KAKAO/C++] 오픈채팅방

https://school.programmers.co.kr/learn/courses/30/lessons/42888

프로그래머스

 

#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <iostream>
#include <sstream>

using namespace std;

vector<string> solution(vector<string> record) {
    vector<string> answer, state;
    map<string, string> user;
    
    for(int i=0; i<record.size(); i++){
        string str[3];
        string token;
        stringstream ss(record[i]);
        
        int index = 0;
        while(ss >> token)
            str[index++] = token;
        
        if(str[0] == "Enter"){
            state.push_back("님이 들어왔습니다.");
            answer.push_back(str[1]);
            user[str[1]] = str[2];
        } else if(str[0] == "Leave") {
            state.push_back("님이 나갔습니다.");
            answer.push_back(str[1]);
        } else { // change
            user[str[1]] = str[2];
        }
    }
    
    for(int i=0; i<answer.size(); i++)
        answer[i] = user[answer[i]] + state[i];
    
    return answer;
}