Interview was most on evaluating based on data structures and algorithms and advanced features of C++. I dont know why they go in depth of it's implementation, as we are meant to use the right container classes and not implement them . Interviewer was there to just show his knowledge and his arrogance. At the end he almost got rude and angry; very unprofessional behaviour. I wouldn't think again to get interviewed here and work with such arrogant chaps.