Eroare de compilare: main.cpp: In instantiation of 'main()::<lambda(auto:1, auto:2)> [with auto:1 = std::pair<long int, int>; auto:2 = std::pair<long int, int>]': /usr/include/c++/6/bits/predefined_ops.h:125:18: required from 'constexpr bool __gnu_cxx::__ops::_Iter_comp_iter<_Compare>::operator()(_Iterator1, _Iterator2) [with _Iterator1 = __gnu_cxx::__normal_iterator<std::pair<long int, int>*, std::vector<std::pair<long int, int> > >; _Iterator2 = __gnu_cxx::__normal_iterator<std::pair<long int, int>*, std::vector<std::pair<long int, int> > >; _Compare = main()::<lambda(auto:1, auto:2)>]' /usr/include/c++/6/bits/stl_algo.h:1844:14: required from 'void std::__insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<std::pair<long int, int>*, std::vector<std::pair<long int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(auto:1, auto:2)> >]' /usr/include/c++/6/bits/stl_algo.h:1882:25: required from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<std::pair<long int, int>*, std::vector<std::pair<long int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(auto:1, auto:2)> >]' /usr/include/c++/6/bits/stl_algo.h:1968:31: required from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<std::pair<long int, int>*, std::vector<std::pair<long int, int> > >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<main()::<lambda(auto:1, auto:2)> >]' /usr/include/c++/6/bits/stl_algo.h:4739:18: required from 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = __gnu_cxx::__normal_iterator<std::pair<long int, int>*, std::vector<std::pair<long int, int> > >; _Compare = main()::<lambda(auto:1, auto:2)>]' main.cpp:62:6: required from here main.cpp:56:20: error: 'cmp' was not declared in this scope int d = cmp(p1.first, p2.first); ~~~^~~~~~~~~~~~~~~~~~~~ In file included from /usr/include/c++/6/algorithm:62:0, from main.cpp:4: /usr/include/c++/6/bits/stl_algo.h:1818:5: warning: 'void std::__unguarded_linear_insert(_RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<std::pair<long int, int>*, std::vector<std::pair<long int, int> > >; _Compare = __gnu_cxx::__ops::_Val_comp_iter<main()::<lambda(auto:1, auto:2)> >]' used but never defined __unguarded_linear_insert(_RandomAccessIterator __last, ^~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /usr/include/c++/6/bits/stl_algobase.h:71:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from main.cpp:1: /usr/include/c++/6/bits/predefined_ops.h:183:5: warning: '__gnu_cxx::__ops::_Val_comp_iter<_Compare> __gnu_cxx::__ops::__val_comp_iter(__gnu_cxx::__ops::_Iter_comp_iter<_Compare>) [with _Compare = main()::<lambda(auto:1, auto:2)>]' used but never defined __val_comp_iter(_Iter_comp_iter<_Compare> __comp) ^~~~~~~~~~~~~~~ Non zero exit status: 1