Eroare de compilare: In file included from /usr/include/c++/5/bits/hashtable.h:35:0, from /usr/include/c++/5/unordered_set:47, from user.cpp:3: /usr/include/c++/5/bits/hashtable_policy.h: In instantiation of ‘struct std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > >’: /usr/include/c++/5/type_traits:137:12: required from ‘struct std::__and_<std::__is_fast_hash<std::hash<std::pair<long long int, long long int> > >, std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > > >’ /usr/include/c++/5/type_traits:148:38: required from ‘struct std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<long long int, long long int> > >, std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > > > >’ /usr/include/c++/5/bits/unordered_set.h:95:63: required from ‘class std::unordered_set<std::pair<long long int, long long int> >’ user.cpp:10:54: required from here /usr/include/c++/5/bits/hashtable_policy.h:85:34: error: no match for call to ‘(const std::hash<std::pair<long long int, long long int> >) (const std::pair<long long int, long long int>&)’ noexcept(declval<const _Hash&>()(declval<const _Key&>()))> ^ In file included from /usr/include/c++/5/bits/move.h:57:0, from /usr/include/c++/5/bits/stl_pair.h:59, from /usr/include/c++/5/bits/stl_algobase.h:64, from /usr/include/c++/5/bits/char_traits.h:39, from /usr/include/c++/5/ios:40, from /usr/include/c++/5/istream:38, from /usr/include/c++/5/fstream:38, from user.cpp:1: /usr/include/c++/5/type_traits: In instantiation of ‘struct std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<long long int, long long int> > >, std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > > > >’: /usr/include/c++/5/bits/unordered_set.h:95:63: required from ‘class std::unordered_set<std::pair<long long int, long long int> >’ user.cpp:10:54: required from here /usr/include/c++/5/type_traits:148:38: error: ‘value’ is not a member of ‘std::__and_<std::__is_fast_hash<std::hash<std::pair<long long int, long long int> > >, std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > > >’ : public integral_constant<bool, !_Pp::value> ^ In file included from /usr/include/c++/5/unordered_set:48:0, from user.cpp:3: /usr/include/c++/5/bits/unordered_set.h: In instantiation of ‘class std::unordered_set<std::pair<long long int, long long int> >’: user.cpp:10:54: required from here /usr/include/c++/5/bits/unordered_set.h:95:63: error: ‘value’ is not a member of ‘std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<long long int, long long int> > >, std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > > > >’ typedef __uset_hashtable<_Value, _Hash, _Pred, _Alloc> _Hashtable; ^ /usr/include/c++/5/bits/unordered_set.h:102:45: error: ‘value’ is not a member of ‘std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<long long int, long long int> > >, std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > > > >’ typedef typename _Hashtable::key_type key_type; ^ /usr/include/c++/5/bits/unordered_set.h:103:47: error: ‘value’ is not a member of ‘std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<long long int, long long int> > >, std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > > > >’ typedef typename _Hashtable::value_type value_type; ^ /usr/include/c++/5/bits/unordered_set.h:104:43: error: ‘value’ is not a member of ‘std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<long long int, long long int> > >, std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > > > >’ typedef typename _Hashtable::hasher hasher; ^ /usr/include/c++/5/bits/unordered_set.h:105:46: error: ‘value’ is not a member of ‘std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<long long int, long long int> > >, std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > > > >’ typedef typename _Hashtable::key_equal key_equal; ^ /usr/include/c++/5/bits/unordered_set.h:106:51: error: ‘value’ is not a member of ‘std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<long long int, long long int> > >, std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > > > >’ typedef typename _Hashtable::allocator_type allocator_type; ^ /usr/include/c++/5/bits/unordered_set.h:111:45: error: ‘value’ is not a member of ‘std::__not_<std::__and_<std::__is_fast_hash<std::hash<std::pair<long long int, long long int> > >, std::__detail::__is_noexcept_hash<std::pair<long long int, long long int>, std::hash<std::pair<long long int, long long int> > > > >’ typedef typename _Hashtable::pointer pointer; ^