/in/foo.cc: In member function 'int SeqList::Search(int)':
/in/foo.cc:14:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < seq.size(); i++) {
                         ~~^~~~~~~~~~~~
/in/foo.cc: In member function 'void SeqList::SearchRemove(int)':
/in/foo.cc:24:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int i = k; i < seq.size() - 1; i++) {
                             ~~^~~~~~~~~~~~~~~~
/in/foo.cc: In member function 'std::vector<int> SeqList::Union(SeqList&)':
/in/foo.cc:36:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < obj.seq.size(); i++) {
                         ~~^~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:60:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < res.size(); i++) {
                     ~~^~~~~~~~~~~~