Eroare de compilare: /usr/include/c++/3.3/bits/stl_heap.h: In function `void std::__adjust_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, _Distance = int, _Tp = int, _Compare = predn]': /usr/include/c++/3.3/bits/stl_heap.h:268: instantiated from `void std::make_heap(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, _Compare = predn]' user.cpp:335: instantiated from here /usr/include/c++/3.3/bits/stl_heap.h:187: error: no match for call to `(predn) (int&, int&)' user.cpp:40: error: candidates are: int predn::operator()(const nod&, const nod&) /usr/include/c++/3.3/bits/stl_heap.h: In function `void std::__push_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, _Distance = int, _Tp = int, _Compare = predn]': /usr/include/c++/3.3/bits/stl_heap.h:197: instantiated from `void std::__adjust_heap(_RandomAccessIterator, _Distance, _Distance, _Tp, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, _Distance = int, _Tp = int, _Compare = predn]' /usr/include/c++/3.3/bits/stl_heap.h:268: instantiated from `void std::make_heap(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >, _Compare = predn]' user.cpp:335: instantiated from here /usr/include/c++/3.3/bits/stl_heap.h:107: error: no match for call to `(predn) (int&, int&)' user.cpp:40: error: candidates are: int predn::operator()(const nod&, const nod&)