/in/foo.cc: In function 'std::vector<PolyTerm> mergePolynomials(const std::vector<PolyTerm>&, const std::vector<PolyTerm>&)':
/in/foo.cc:20:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (i < poly1.size() && j < poly2.size())
            ~~^~~~~~~~~~~~~~
/in/foo.cc:20:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (i < poly1.size() && j < poly2.size())
                                ~~^~~~~~~~~~~~~~