Eroare de compilare: main.cpp:14:28: error: ISO C++ forbids declaration of 'elem' with no type [-fpermissive] 14 | bool operator()(const &elem a,const &elem b) | ^~~~ main.cpp:14:33: error: expected ',' or '...' before 'a' 14 | bool operator()(const &elem a,const &elem b) | ^ main.cpp: In member function 'bool cmp::operator()(const int&)': main.cpp:16:16: error: 'a' was not declared in this scope 16 | return a.cost>b.cost; | ^ main.cpp:16:23: error: 'b' was not declared in this scope 16 | return a.cost>b.cost; | ^ In file included from /usr/include/c++/12.2.1/bits/stl_algobase.h:71, from /usr/include/c++/12.2.1/bits/specfun.h:45, from /usr/include/c++/12.2.1/cmath:1935, from /usr/include/c++/12.2.1/x86_64-pc-linux-gnu/bits/stdc++.h:41, from main.cpp:1: /usr/include/c++/12.2.1/bits/predefined_ops.h: In instantiation of 'constexpr bool __gnu_cxx::__ops::_Iter_comp_val<_Compare>::operator()(_Iterator, _Value&) [with _Iterator = __gnu_cxx::__normal_iterator<elem*, std::vector<elem> >; _Value = elem; _Compare = cmp]': /usr/include/c++/12.2.1/bits/stl_heap.h:140:48: required from 'constexpr void std::__push_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare&) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<elem*, vector<elem> >; _Distance = long int; _Tp = elem; _Compare = __gnu_cxx::__ops::_Iter_comp_val<cmp>]' /usr/include/c++/12.2.1/bits/stl_heap.h:216:23: required from 'constexpr void std::push_heap(_RAIter, _RAIter, _Compare) [with _RAIter = __gnu_cxx::__normal_iterator<elem*, vector<elem> >; _Compare = cmp]' /usr/include/c++/12.2.1/bits/stl_queue.h:749:16: required from 'void std::priority_queue<_Tp, _Sequence, _Compare>::push(value_type&&) [with _Tp = elem; _Sequence = std::vector<elem>; _Compare = cmp; value_type = elem]' main.cpp:36:15: required from here /usr/include/c++/12.2.1/bits/predefined_ops.h:196:30: error: no match for call to '(cmp) (elem&, elem&)' 196 | { return bool(_M_comp(*__it, __val)); } | ~~~~~~~^~~~~~~~~~~~~~ main.cpp:14:10: note: candidate: 'bool cmp::operator()(const int&)' 14 | bool operator()(const &elem a,const &elem b) | ^~~~~~~~ main.cpp:14:10: note: candidate expects 1 argument, 2 provided /usr/include/c++/12.2.1/bits/predefined_ops.h: In instantiation of 'constexpr bool __gnu_cxx::__ops::_Iter_comp_iter<_Compare>::operator()(_Iterator1, _Iterator2) [with _Iterator1 = __gnu_cxx::__normal_iterator<elem*, std::vector<elem> >; _Iterator2 = __gnu_cxx::__normal_iterator<elem*, std::vector<elem> >; _Compare = cmp]': /usr/include/c++/12.2.1/bits/stl_heap.h:232:14: required from 'constexpr void std::__adjust_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<elem*, vector<elem> >; _Distance = long int; _Tp = elem; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<cmp>]' /usr/include/c++/12.2.1/bits/stl_heap.h:264:25: required from 'constexpr void std::__pop_heap(_RandomAccessIterator, _RandomAccessIterator, _RandomAccessIterator, _Compare&) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<elem*, vector<elem> >; _Compare = __gnu_cxx::__ops::_Iter_comp_iter<cmp>]' /usr/include/c++/12.2.1/bits/stl_heap.h:333:19: required from 'constexpr void std::pop_heap(_RAIter, _RAIter, _Compare) [with _RAIter = __gnu_cxx::__normal_iterator<elem*, vector<elem> >; _Compare = cmp]' /usr/include/c++/12.2.1/bits/stl_queue.h:776:15: required from 'void std::priority_queue<_Tp, _Sequence, _Compare>::pop() [with _Tp = elem; _Sequence = std::vector<elem>; _Compare = cmp]' main.cpp:44:14: required from here /usr/include/c++/12.2.1/bits/predefined_ops.h:158:30: error: no match for call to '(cmp) (elem&, elem&)' 158 | { return bool(_M_comp(*__it1, *__it2)); } | ~~~~~~~^~~~~~~~~~~~~~~~ main.cpp:14:10: note: candidate: 'bool cmp::operator()(const int&)' 14 | bool operator()(const &elem a,const &elem b) | ^~~~~~~~ main.cpp:14:10: note: candidate expects 1 argument, 2 provided Non zero exit status: 1