/in/foo.cc: In function 'int main()':
/in/foo.cc:23:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   23 |         cout << "NO";
      |         ^~~~
      |         std::cout
In file included from /in/foo.cc:1:
/usr/include/c++/12/iostream:61:18: note: 'std::cout' declared here
   61 |   extern ostream cout;          /// Linked to standard output
      |                  ^~~~