/in/foo.cc: In function 'int main()':
/in/foo.cc:12:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   12 |         cout >> ans >> endl;
      |         ^~~~
      |         std::cout
In file included from /usr/include/x86_64-linux-gnu/c++/12/bits/stdc++.h:75,
                 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
      |                  ^~~~
/in/foo.cc:12:24: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   12 |         cout >> ans >> endl;
      |                        ^~~~
      |                        std::endl
In file included from /usr/include/c++/12/istream:39,
                 from /usr/include/c++/12/sstream:38,
                 from /usr/include/c++/12/complex:45,
                 from /usr/include/c++/12/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/12/bits/stdc++.h:54:
/usr/include/c++/12/ostream:688:5: note: 'std::endl' declared here
  688 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~