/in/foo.cc: In member function 'PolyList PolyList::operator+(const PolyList&) const':
/in/foo.cc:55:26: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   55 |         for (const auto &[fst, snd]: nodes) {
      |                          ^
/in/foo.cc:60:56: error: wrong number of template arguments (0, should be 1)
   60 |         std::sort(ret.begin(), ret.end(), std::greater<>());
      |                                                        ^
In file included from /usr/include/c++/12/string:48,
                 from /usr/include/c++/12/bits/locale_classes.h:40,
                 from /usr/include/c++/12/bits/ios_base.h:41,
                 from /usr/include/c++/12/ios:42,
                 from /usr/include/c++/12/istream:38,
                 from /usr/include/c++/12/sstream:38,
                 from /usr/include/c++/12/complex:45,
                 from /usr/include/c++/12/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/12/bits/stdc++.h:54,
                 from /in/foo.cc:1:
/usr/include/c++/12/bits/stl_function.h:393:12: note: provided for 'template<class _Tp> struct std::greater'
  393 |     struct greater : public binary_function<_Tp, _Tp, bool>
      |            ^~~~~~~