func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     const int MAX_N = 200000;     int n;     char s[MAX_N][20];     set<string> chat;     scanf( %d , &n);     for (int i = 0; i < n; i++) {       scanf( %s , s[i]);     }     for (int i = n - 1; i >= 0; i--) {       if (chat.find(s[i]) == chat.end()) {         printf( %s n , s[i]);       }       chat.insert(s[i]);     }     return 0;   }   