백준 문제풀이

BOJ 7785.cpp

#include <bits/stdc++.h>
using namespace std;

int N;
set<string> Employee;

int main(){ios_base::sync_with_stdio(false); cout.tie(NULL); cin.tie(NULL);

cin >> N;
for (int i = 0; i < N; ++i){
	string a, b;
	cin >> a >> b;
	if(b == "enter") Employee.insert(a);
	else Employee.erase(a);
}
auto iter = Employee.end();
while(1){
	iter--;
	cout << *iter << '\n';
	if(iter==Employee.begin()) break;
}

return 0;
}