Language: C++

#include<bits/stdc++.h>
 namespace std;

int main(){
  int n;
  cin>>n;
  long long ans=1;
  vector<long long>z(n);
  for(int j=0;j<n;j++){
    cin>>z[j];
  }
  sort(z.begin(),z.end());
  for(int i=0;i<n;i++){
    if(ans/round(pow(10,18))*z[i]<1){
      ans=ans*z[i];
    }
    else{
      cout<<-1<<endl;
      return 0;
    }
  }
  cout<<ans<<endl;
}


Compiler output:
a.cc:2:15: error: expected '{' before ';' token
    2 |  namespace std;
      |               ^
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin>>n;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:8:3: error: 'vector' was not declared in this scope
    8 |   vector<long long>z(n);
      |   ^~~~~~
a.cc:8:3: note: suggested alternatives:
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53:
/usr/include/c++/14/bits/stl_vector.h:428:11: note:   'std::vector'
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
/usr/include/c++/14/vector:93:13: note:   'std::pmr::vector'
   93 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
a.cc:8:10: error: expected primary-expression before 'long'
    8 |   vector<long long>z(n);
      |          ^~~~
a.cc:10:10: error: 'z' was not declared in this scope
   10 |     cin>>z[j];
      |          ^
a.cc:12:8: error: 'z' was not declared in this scope
   12 |   sort(z.begin(),z.end());
      |        ^
a.cc:12:3: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
   12 |   sort(z.begin(),z.end());
      |   ^~~~
      |   std::sort
In file included from /usr/include/c++/14/algorithm:86,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: 'std::sort' declared here
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
a.cc:18:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   18 |       cout<<-1<<endl;
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:18:17: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   18 |       cout<<-1<<endl;
      |                 ^~~~
      |                 std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:22:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   22 |   cout<<ans<<endl;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:22:14: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   22 |   cout<<ans<<endl;
      |              ^~~~
      |              std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~