went to the last round, Interviewer joined 25 min late, asked some confusing question about calculating minimum distance on a graph, which i asked to explain (as he was not satisfy with my answer ) but he didnt gave any explanation and didnt asked any further question. It was over in 8 mins only. He was senior guy and totally get that he must be busy, but treating applicants nothing immediately raised the red flags. Later got got feedback that my aptitude is not strong, like really? sir get your aptitude checked then say.