[C++] 7785 - 회사에 있는 사람

#include <bits/stdc++.h> 
#include<iostream>
#include<map>
#include<utility>
#include<algorithm>
#include<set>
#include<string>
#define endl '\n';
 
using namespace std;
 
set<string> s;
 
int main(void)
{
    ios_base :: sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
 
    int n;
    string name;
    string log;
    cin >> n;
 
    for(int i = 0; i < n; ++i)
    {
        cin >> name    >> log;
        if(!log.compare("enter"))
            s.insert(name);
        else
            s.erase(name);
        
    }
 
    for(set<string>::reverse_iterator iter = s.rbegin(); iter != s.rend(); ++iter)
        cout << *iter << endl;
 
    return 0;
}