/in/foo.cc: In member function 'List List::Bin(const List&) const':
/in/foo.cc:32:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < data.size(); ++i)
                         ~~^~~~~~~~~~~~~
/in/foo.cc: In member function 'bool List::Search(int) const':
/in/foo.cc:45:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < data.size(); ++i)
                         ~~^~~~~~~~~~~~~
/in/foo.cc: In member function 'void List::print() const':
/in/foo.cc:58:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 1; i < data.size(); ++i)
                         ~~^~~~~~~~~~~~~