/in/foo.cc: In member function 'void PolyLinkList::print()':
/in/foo.cc:91:9: error: 'vector' was not declared in this scope
         vector<pair<int, int>> terms;
         ^~~~~~
/in/foo.cc:91:29: error: expected primary-expression before '>' token
         vector<pair<int, int>> terms;
                             ^~
/in/foo.cc:91:32: error: 'terms' was not declared in this scope
         vector<pair<int, int>> terms;
                                ^~~~~
/in/foo.cc:100:33: error: unable to deduce 'auto&&' from 'terms'
         for (const auto& term : terms) {
                                 ^~~~~