[프로그래머스 lv 2 ] - 오픈채팅방

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

코딩테스트 연습 - 오픈채팅방

#include <string>
#include <vector>
#include <unordered_map>
#include <queue>
using namespace std;

string strTok(string& str,int& i)
{
    string result;    
    for( ;i<str.size();i++)
    {                
        if(str[i]==' ')
        {
            break;
        }
        result+=str[i];
    }  
    return result;
}


vector<string> solution(vector<string> record) {
    vector<string> answer;
    unordered_map<string,string> m; //uid,nick
    queue<pair<char,string>> q; //명령어 저장
    
    
    //전체 명령 파악하기
    for(auto a: record)
    {        
        string curRecord=a; //현재 기록 (ex : Enter인지, Leave인지 등등..)
        string uid; 
        string nick;
        string curOrder;
        
        int i=0;
        if(curRecord[0]=='E')
        {      
            i=6;
            uid=strTok(curRecord,i);
            i++;
            nick=strTok(curRecord,i);
            q.push( pair<char,string>('E',uid) );
        }else if(curRecord[0]=='L')
        {            
            i=6;
            uid=strTok(curRecord,i);
            curOrder+=uid;
            q.push( pair<char,string>('L',uid) );
            nick = m[uid];
        }else if(curRecord[0]=='C')
        {
            curOrder+="C ";
            i=7;
            uid=strTok(curRecord,i);
            i++;
            nick=strTok(curRecord,i);  

        }
        //최종 닉네임 map 
        m[uid]=nick;
    }
    
    //들어왔던 명령 순서대로 출력 저장하기
    while( !q.empty() )
	{
		char order = q.front().first;
		string id = q.front().second;
		q.pop();
		string result;
		if( order == 'E' )
		{
			result = m[id] + "님이 들어왔습니다.";
			answer.push_back( result );
		}if( order == 'L' )
		{
			result = m[id] + "님이 나갔습니다.";
			answer.push_back( result );
		}
	}
    return answer;
}