/in/foo.cc: In member function 'PolyList PolyList::operator+(PolyList&)':
/in/foo.cc:24:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while (i <t.size() && j <obj.t.size())
          ~~^~~~~~~~~
/in/foo.cc:24:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while (i <t.size() && j <obj.t.size())
                         ~~^~~~~~~~~~~~~
/in/foo.cc:44:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while(i<t.size())
          ~^~~~~~~~~
/in/foo.cc:49:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while(j<obj.t.size())
          ~^~~~~~~~~~~~~