/in/foo.cc: In member function 'void girlfriends::enter(const std::vector<std::__cxx11::basic_string<char> >&)':
/in/foo.cc:50:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int n=0;n<girls[i].size();n++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc: In member function 'void girlfriends::inquiry(const std::vector<std::__cxx11::basic_string<char> >&)':
/in/foo.cc:76:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int n = 0; n < all_name.size(); n++) {
                    ~~^~~~~~~~~~~~~~~~~
/in/foo.cc:91:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int n = 0; n < all_adress.size(); n++) {
                    ~~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:94:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for (int i = 1; i < all_name[n].size()-1; i++)
                      ~~^~~~~~~~~~~~~~~~~~~~~~