Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:23:45: error: could not convert ‘h.std::unordered_set<_Value, _Hash, _Pred, _Alloc>::find<long long int, std::hash<long long int>, std::equal_to<long long int>, std::allocator<long long int> >((* &(((s - a[i]) - a[j]) - a[k])))’ from ‘std::unordered_set<long long int>::iterator {aka std::__detail::_Node_iterator<long long int, true, false>}’ to ‘bool’ if (h.find(s-a[i]-a[j]-a[k])) { ^