Answers for "what vector erase do"

vector erase specific element

vector.erase( vector.begin() + 3 ); // Deleting the fourth element

vector remove class

carVec.erase(std::remove_if(carVec.begin(), carVec.end(), [&id_to_delete](const Car& ele)->bool
            {
                return ele.getnewId() == id_to_delete;
            }), carVec.end());