/in/foo.cc: In member function 'fastIO::Sww fastIO::Sww::operator<<(std::string)':
/in/foo.cc:91:43: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |                         for (int i = 0; i < s.size(); i++)
      |                                         ~~^~~~~~~~~~

FormatError('config file not found')