func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     set<int> s;     for (int i = 0; i < n; i++) {       int x;       cin >> x;       s.insert(x);     }     set<int>::iterator it = s.begin();     int c = 0;     while (it != s.end()) {       if (*it == 0) c++;       it++;     }     cout << s.size() - c << endl;   }   