Eroare de compilare: 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/ostream:38, from /usr/include/c++/6/iostream:39, from user.cpp:1: /usr/include/c++/6/bits/predefined_ops.h: In instantiation of ‘constexpr bool __gnu_cxx::__ops::_Iter_less_iter::operator()(_Iterator1, _Iterator2) const [with _Iterator1 = int; _Iterator2 = int]’: /usr/include/c++/6/bits/stl_algo.h:2918:14: required from ‘bool std::__next_permutation(_BidirectionalIterator, _BidirectionalIterator, _Compare) [with _BidirectionalIterator = int; _Compare = __gnu_cxx::__ops::_Iter_less_iter]’ /usr/include/c++/6/bits/stl_algo.h:2963:2: required from ‘bool std::next_permutation(_BIter, _BIter) [with _BIter = int]’ user.cpp:18:30: required from here /usr/include/c++/6/bits/predefined_ops.h:43:16: error: invalid type argument of unary ‘*’ (have ‘int’) { return *__it1 < *__it2; } ^~~~~~ /usr/include/c++/6/bits/predefined_ops.h:43:25: error: invalid type argument of unary ‘*’ (have ‘int’) { return *__it1 < *__it2; } ^~~~~~ In file included from /usr/include/c++/6/algorithm:62:0, from user.cpp:3: /usr/include/c++/6/bits/stl_algo.h: In instantiation of ‘bool std::__next_permutation(_BidirectionalIterator, _BidirectionalIterator, _Compare) [with _BidirectionalIterator = int; _Compare = __gnu_cxx::__ops::_Iter_less_iter]’: /usr/include/c++/6/bits/stl_algo.h:2963:2: required from ‘bool std::next_permutation(_BIter, _BIter) [with _BIter = int]’ user.cpp:18:30: required from here /usr/include/c++/6/bits/stl_algo.h:2925:33: error: no matching function for call to ‘__iterator_category(int&)’ std::__iterator_category(__first)); ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~ In file included from /usr/include/c++/6/bits/stl_algobase.h:65:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40, from /usr/include/c++/6/ostream:38, from /usr/include/c++/6/iostream:39, from user.cpp:1: /usr/include/c++/6/bits/stl_iterator_base_types.h:204:5: note: candidate: template<class _Iter> typename std::iterator_traits<_Iterator>::iterator_category std::__iterator_category(const _Iter&) __iterator_category(const _Iter&) ^~~~~~~~~~~~~~~~~~~ /usr/include/c++/6/bits/stl_iterator_base_types.h:204:5: note: template argument deduction/substitution failed: /usr/include/c++/6/bits/stl_iterator_base_types.h: In substitution of ‘template<class _Iter> typename std::iterator_traits<_Iterator>::iterator_category std::__iterator_category(const _Iter&) [with _Iter = int]’: /usr/include/c++/6/bits/stl_algo.h:2925:33: required from ‘bool std::__next_permutation(_BidirectionalIterator, _BidirectionalIterator, _Compare) [with _BidirectionalIterator = int; _Compare = __gnu_cxx::__ops::_Iter_less_iter]’ /usr/include/c++/6/bits/stl_algo.h:2963:2: required from ‘bool std::next_permutation(_BIter, _BIter) [with _BIter = int]’ user.cpp:18:30: required from here /usr/include/c++/6/bits/stl_iterator_base_types.h:204:5: error: no type named ‘iterator_category’ in ‘struct std::iterator_traits<int>’ In file included from /usr/include/c++/6/algorithm:62:0, from user.cpp:3: /usr/include/c++/6/bits/stl_algo.h: In instantiation of ‘bool std::__next_permutation(_BidirectionalIterator, _BidirectionalIterator, _Compare) [with _BidirectionalIterator = int; _Compare = __gnu_cxx::__ops::_Iter_less_iter]’: /usr/include/c++/6/bits/stl_algo.h:2963:2: required from ‘bool std::next_permutation(_BIter, _BIter) [with _BIter = int]’ user.cpp:18:30: required from here /usr/include/c++/6/bits/stl_algo.h:2931:33: error: no matching function for call to ‘__iterator_category(int&)’ std::__iterator_category(__first)); ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~ In file included from /usr/include/c++/6/bits/stl_algobase.h:65:0, from /usr/include/c++/6/bits/char_traits.h:39, from /usr/include/c++/6/ios:40,