Eroare de compilare: user.cpp: In function ‘long long int rezolva(int, int*)’: user.cpp:33:48: error: invalid initialization of non-const reference of type ‘int&’ from an rvalue of type ‘std::unordered_map<int, int>::iterator {aka std::__detail::_Node_iterator<std::pair<const int, int>, false, false>}’ int &value = h.find(2 * v[i] - v[j]) ; ^