Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:22:29: error: no match for ‘operator!=’ (operand types are ‘std::unordered_map<int, int>::iterator {aka std::__detail::_Node_iterator<std::pair<const int, int>, false, false>}’ and ‘<unresolved overloaded function type>’) int val = (mymap.find(b) != mymap.end); ^ user.cpp:22:29: note: candidates are: In file included from /usr/include/c++/4.8/iosfwd:40:0, from /usr/include/c++/4.8/ios:38, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:2: /usr/include/c++/4.8/bits/postypes.h:221:5: note: template<class _StateT> bool std::operator!=(const std::fpos<_StateT>&, const std::fpos<_StateT>&) operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs) ^ /usr/include/c++/4.8/bits/postypes.h:221:5: note: template argument deduction/substitution failed: user.cpp:22:38: note: ‘std::unordered_map<int, int>::iterator {aka std::__detail::_Node_iterator<std::pair<const int, int>, false, false>}’ is not derived from ‘const std::fpos<_StateT>’ int val = (mymap.find(b) != mymap.end); ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:64:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:2: /usr/include/c++/4.8/bits/stl_pair.h:227:5: note: template<class _T1, class _T2> constexpr bool std::operator!=(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&) operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) ^ /usr/include/c++/4.8/bits/stl_pair.h:227:5: note: template argument deduction/substitution failed: user.cpp:22:38: note: ‘std::unordered_map<int, int>::iterator {aka std::__detail::_Node_iterator<std::pair<const int, int>, false, false>}’ is not derived from ‘const std::pair<_T1, _T2>’ int val = (mymap.find(b) != mymap.end); ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:2: /usr/include/c++/4.8/bits/stl_iterator.h:303:5: note: template<class _Iterator> bool std::operator!=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&) operator!=(const reverse_iterator<_Iterator>& __x, ^ /usr/include/c++/4.8/bits/stl_iterator.h:303:5: note: template argument deduction/substitution failed: user.cpp:22:38: note: ‘std::unordered_map<int, int>::iterator {aka std::__detail::_Node_iterator<std::pair<const int, int>, false, false>}’ is not derived from ‘const std::reverse_iterator<_Iterator>’ int val = (mymap.find(b) != mymap.end); ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0, from /usr/include/c++/4.8/bits/char_traits.h:39, from /usr/include/c++/4.8/ios:40, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:2: /usr/include/c++/4.8/bits/stl_iterator.h:353:5: note: template<class _IteratorL, class _IteratorR> bool std::operator!=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)