func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     vector<string> a(n);     for (int i = 0; i < n; i++) {       cin >> a[i];     }     set<string> s;     for (int i = n - 1; i >= 0; i--) {       if (s.find(a[i]) == s.end()) {         cout << a[i] <<   n ;       }       s.insert(a[i]);     }     return 0;   }   