/in/foo.cc: In function 'void getNext(const node&, const edge&, std::vector<node>&)':
/in/foo.cc:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < ids.size(); i++) {
                     ~~^~~~~~~~~~~~
/in/foo.cc:44:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j = i + 1; j < ids.size(); j++) {
                             ~~^~~~~~~~~~~~