Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:19:27: error: could not convert ‘h.std::set<_Key, _Compare, _Alloc>::find<long long int, std::less<long long int>, std::allocator<long long int> >((* &((std::set<long long int>::key_type)x)))’ from ‘std::set<long long int>::iterator {aka std::_Rb_tree_const_iterator<long long int>}’ to ‘bool’ if ( h.find(x) ) ++sol; ^