func_code_string: #include <bits/stdc++.h>   using namespace std;   vector<string> s;   map<string, bool> was;   int main() {     int n;     cin >> n;     s.resize(n);     for (int i = 0; i < n; i++) {       cin >> s[i];     }     for (int i = n - 1; i >= 0; i--) {       if (!was[s[i]]) {         cout << s[i] <<   n ;         was[s[i]] = true;       }     }     return 0;   }   