Eroare de compilare: In file included from /usr/include/c++/10/string:48, from /usr/include/c++/10/bits/locale_classes.h:40, from /usr/include/c++/10/bits/ios_base.h:41, from /usr/include/c++/10/ios:42, from /usr/include/c++/10/istream:38, from /usr/include/c++/10/fstream:38, from main.cpp:1: /usr/include/c++/10/bits/stl_function.h: In instantiation of 'constexpr bool std::less<_Tp>::operator()(const _Tp&, const _Tp&) const [with _Tp = graf]': /usr/include/c++/10/bits/predefined_ops.h:194:23: required from 'bool __gnu_cxx::__ops::_Iter_comp_val<_Compare>::operator()(_Iterator, _Value&) [with _Iterator = __gnu_cxx::__normal_iterator<graf*, std::vector<graf> >; _Value = graf; _Compare = std::less<graf>]' /usr/include/c++/10/bits/stl_heap.h:139:48: required from 'void std::__push_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare&) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<graf*, std::vector<graf> >; _Distance = long int; _Tp = graf; _Compare = __gnu_cxx::__ops::_Iter_comp_val<std::less<graf> >]' /usr/include/c++/10/bits/stl_heap.h:215:23: required from 'void std::push_heap(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<graf*, std::vector<graf> >; _Compare = std::less<graf>]' /usr/include/c++/10/bits/stl_queue.h:651:16: required from 'void std::priority_queue<_Tp, _Sequence, _Compare>::push(std::priority_queue<_Tp, _Sequence, _Compare>::value_type&&) [with _Tp = graf; _Sequence = std::vector<graf>; _Compare = std::less<graf>; std::priority_queue<_Tp, _Sequence, _Compare>::value_type = graf]' main.cpp:27:16: required from here /usr/include/c++/10/bits/stl_function.h:386:20: error: no match for 'operator<' (operand types are 'const graf' and 'const graf') 386 | { return __x < __y; } | ~~~~^~~~~ In file included from /usr/include/c++/10/bits/stl_algobase.h:64, from /usr/include/c++/10/bits/char_traits.h:39, from /usr/include/c++/10/ios:40, from /usr/include/c++/10/istream:38, from /usr/include/c++/10/fstream:38, from main.cpp:1: /usr/include/c++/10/bits/stl_pair.h:489:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator<(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)' 489 | operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) | ^~~~~~~~ /usr/include/c++/10/bits/stl_pair.h:489:5: note: template argument deduction/substitution failed: In file included from /usr/include/c++/10/string:48, from /usr/include/c++/10/bits/locale_classes.h:40, from /usr/include/c++/10/bits/ios_base.h:41, from /usr/include/c++/10/ios:42, from /usr/include/c++/10/istream:38, from /usr/include/c++/10/fstream:38, from main.cpp:1: /usr/include/c++/10/bits/stl_function.h:386:20: note: 'const graf' is not derived from 'const std::pair<_T1, _T2>' 386 | { return __x < __y; } | ~~~~^~~~~ In file included from /usr/include/c++/10/bits/stl_algobase.h:67, from /usr/include/c++/10/bits/char_traits.h:39, from /usr/include/c++/10/ios:40, from /usr/include/c++/10/istream:38, from /usr/include/c++/10/fstream:38, from main.cpp:1: /usr/include/c++/10/bits/stl_iterator.h:391:5: note: candidate: 'template<class _Iterator> bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)' 391 | operator<(const reverse_iterator<_Iterator>& __x, | ^~~~~~~~ /usr/include/c++/10/bits/stl_iterator.h:391:5: note: template argument deduction/substitution failed: In file included from /usr/include/c++/10/string:48, from /usr/include/c++/10/bits/locale_classes.h:40, from /usr/include/c++/10/bits/ios_base.h:41, from /usr/include/c++/10/ios:42, Non zero exit status: 1