func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, i;     vector<char> v;     string s;     cin >> s;     n = s.size();     char c[n], ch;     i = n;     ch = s[n - 1];     while (i--) {       if (s[i] == ch)         v.push_back(s[i]);       else if (s[i] > ch) {         v.push_back(s[i]);         ch = s[i];       }     }     for (i = v.size(); i > 0; i--) cout << v[i - 1];   }   