func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   int main() {     vector<int> v;     int n;     cin >> n;     for (int i = 0; i < n; i++) {       int t;       cin >> t;       v.push_back(t);     }     sort(v.begin(), v.end());     v.erase(unique(v.begin(), v.end()), v.end());     v.erase(remove(v.begin(), v.end(), 0), v.end());     cout << v.size() <<   n ;   }   