[백준]17219 - 비밀번호 찾기(설명X)

#include <iostream>
#include <string>
#include <unordered_map>
using namespace std;
 
int main() {
    cin.tie(NULL);
    ios::sync_with_stdio(false);
 
    unordered_map<string, string> map;
    int N, M;
    cin >> N >> M;
 
    for (int i = 0; i < N; i++) {
        string site, pass;
        cin >> site >> pass;
 
        map.insert({ site, pass });
    }
 
    for (int i = 0; i < M; i++) {
        string site;
        cin >> site;
        cout << map.at(site) << "\n";
    }
}