/in/foo.cc: In function 'int main()':
/in/foo.cc:22:13: error: use of 'auto' in lambda parameter declaration only available with '-std=c++14' or '-std=gnu++14'
   22 |          [](auto &x, auto &y){ return x.first > y.first; });
      |             ^~~~
/in/foo.cc:22:22: error: use of 'auto' in lambda parameter declaration only available with '-std=c++14' or '-std=gnu++14'
   22 |          [](auto &x, auto &y){ return x.first > y.first; });
      |                      ^~~~
/in/foo.cc: In lambda function:
/in/foo.cc:22:41: error: request for member 'first' in 'x', which is of non-class type 'int'
   22 |          [](auto &x, auto &y){ return x.first > y.first; });
      |                                         ^~~~~
/in/foo.cc:22:51: error: request for member 'first' in 'y', which is of non-class type 'int'
   22 |          [](auto &x, auto &y){ return x.first > y.first; });
      |                                                   ^~~~~
In file included from /usr/include/c++/12/bits/stl_algobase.h:71,
                 from /usr/include/c++/12/string:50,
                 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/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Iter_comp_iter<_Compare>::operator()(_Iterator1, _Iterator2) [with _Iterator1 = __gnu_cxx::__normal_iterator<std::pair<int, int>*, std::vector<std::pair<int, int> > >; _Iterator2 = __gnu_cxx::__normal_iterator<std::pair<int, int>*, std::vector<std::pair<int, int> > >; _Compare = main()::<lambda(int&, int&)>]':
/usr/include/c++/12/bits/stl_algo.h:1809:14:   required from 'void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(int&, int&)> >]'
/usr/include/c++/12/bits/stl_algo.h:1849:25:   required from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(int&, int&)> >]'
/usr/include/c++/12/bits/stl_algo.h:1940:31:   required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(int&, int&)> >]'
/usr/include/c++/12/bits/stl_algo.h:4853:18:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = main()::<lambda(int&, int&)>]'
/in/foo.cc:21:9:   required from here
/usr/include/c++/12/bits/predefined_ops.h:158:30: error: no match for call to '(main()::<lambda(int&, int&)>) (std::pair<int, int>&, std::pair<int, int>&)'
  158 |         { return bool(_M_comp(*__it1, *__it2)); }
      |                       ~~~~~~~^~~~~~~~~~~~~~~~
/in/foo.cc:22:10: note: candidate: 'main()::<lambda(int&, int&)>'
   22 |          [](auto &x, auto &y){ return x.first > y.first; });
      |          ^
/in/foo.cc:22:10: note:   no known conversion for argument 1 from 'std::pair<int, int>' to 'int&'
/usr/include/c++/12/bits/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Val_comp_iter<_Compare>::operator()(_Value&, _Iterator) [with _Value = std::pair<int, int>; _Iterator = __gnu_cxx::__normal_iterator<std::pair<int, int>*, std::vector<std::pair<int, int> > >; _Compare = main()::<lambda(int&, int&)>]':
/usr/include/c++/12/bits/stl_algo.h:1789:20:   required from 'void std::__unguarded_linear_insert(_RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = __gnu_cxx::__ops::_Val_comp_iter<main()::<lambda(int&, int&)> >]'
/usr/include/c++/12/bits/stl_algo.h:1817:36:   required from 'void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(int&, int&)> >]'
/usr/include/c++/12/bits/stl_algo.h:1849:25:   required from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(int&, int&)> >]'
/usr/include/c++/12/bits/stl_algo.h:1940:31:   required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(int&, int&)> >]'
/usr/include/c++/12/bits/stl_algo.h:4853:18:   required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = main()::<lambda(int&, int&)>]'
/in/foo.cc:21:9:   required from here
/usr/include/c++/12/bits/predefined_ops.h:240:30: error: no match for call to '(main()::<lambda(int&, int&)>) (std::pair<int, int>&, std::pair<int, int>&)'
  240 |         { return bool(_M_comp(__val, *__it)); }
      |                       ~~~~~~~^~~~~~~~~~~~~~
/in/foo.cc:22:10: note: candidate: 'main()::<lambda(int&, int&)>'
   22 |          [](auto &x, auto &y){ return x.first > y.first; });
      |          ^
/in/foo.cc:22:10: note:   no known conversion for argument 1 from 'std::pair<int, int>' to 'int&'
/usr/include/c++/12/bits/predefined_ops.h: In instantiation of 'bool __gnu_cxx::__ops::_Iter_comp_val<_Compare>::operator()(_Iterator, _Value&) [with _Iterator = __gnu_cxx::__normal_iterator<std::pair<int, int>*, std::vector<std::pair<int, int> > >; _Value = std::pair<int, int>; _Compare = main()::<lambda(int&, int&)>]':
/usr/include/c++/12/bits/stl_heap.h:140:48:   required from 'void std::__push_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare&) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Distance = long int; _Tp = pair<int, int>; _Compare = __gnu_cxx::__ops::_Iter_comp_val<main()::<lambda(int&, int&)> >]'
/usr/include/c++/12/bits/stl_heap.h:247:23:   required from 'void std::__adjust_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Distance = long int; _Tp = pair<int, int>; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(int&, int&)> >]'
/usr/include/c++/12/bits/stl_heap.h:356:22:   required from 'void std::__make_heap(_RandomAccessIterator, _RandomAccessIterator, _Compare&) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(int&, int&)> >]'
/usr/include/c++/12/bits/stl_algo.h:1629:23:   required from 'void std::__heap_select(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(int&, int&)> >]'
/usr/include/c++/12/bits/stl_algo.h:1900:25:   required from 'void std::__partial_sort(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<pair<int, int>*, vector<pair<int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<ma