/in/foo.cc: In function 'int main()':
/in/foo.cc:12:16: error: 'numeric_limits' was not declared in this scope
   12 |     cin.ignore(numeric_limits<streamsize>::max(), '\n');
      |                ^~~~~~~~~~~~~~
/in/foo.cc:12:41: error: expected primary-expression before '>' token
   12 |     cin.ignore(numeric_limits<streamsize>::max(), '\n');
      |                                         ^
/in/foo.cc:12:48: error: no matching function for call to 'max()'
   12 |     cin.ignore(numeric_limits<streamsize>::max(), '\n');
      |                                                ^
In file included from /usr/include/c++/9/bits/char_traits.h:39,
                 from /usr/include/c++/9/ios:40,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/9/bits/stl_algobase.h:222:5: note: candidate: 'template<class _Tp> const _Tp& std::max(const _Tp&, const _Tp&)'
  222 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/9/bits/stl_algobase.h:222:5: note:   template argument deduction/substitution failed:
/in/foo.cc:12:48: note:   candidate expects 2 arguments, 0 provided
   12 |     cin.ignore(numeric_limits<streamsize>::max(), '\n');
      |                                                ^
In file included from /usr/include/c++/9/bits/char_traits.h:39,
                 from /usr/include/c++/9/ios:40,
                 from /usr/include/c++/9/ostream:38,
                 from /usr/include/c++/9/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/9/bits/stl_algobase.h:268:5: note: candidate: 'template<class _Tp, class _Compare> const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  268 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/9/bits/stl_algobase.h:268:5: note:   template argument deduction/substitution failed:
/in/foo.cc:12:48: note:   candidate expects 3 arguments, 0 provided
   12 |     cin.ignore(numeric_limits<streamsize>::max(), '\n');
      |                                                ^