Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:32:29: error: cannot bind ‘std::basic_ostream<char>’ lvalue to ‘std::basic_ostream<char>&&’ output<<v.find(x) != v.end(); ^ In file included from /usr/include/c++/4.8/iostream:39:0, from user.cpp:1: /usr/include/c++/4.8/ostream:602:5: error: initializing argument 1 of ‘std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = std::__detail::_Node_iterator<int, true, false>]’ operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x) ^