Anaplan Software Developer interview questions

It started with a phone screen followed by 7 rounds of onsite interviews. Technical rounds were around 4. One concern I have about the interview is the rude interviewer. There was one guy, very young maybe is taking his first or second interview. He asked a question and was pushing very hard for time complexity. I asked for some time to compute it as it was recursive algorithm and I had to make recursive equation to solve it. He kept on growing impatient. I gave an answer and then he asked me if I memoize it, what would be the complexity. Without giving me a chance to think about it, or solve something on the board, he just wanted me to throw back an answer. Maybe he had crammed the question and answer before he came to the interview room, but not me. I was asked to answer in like 5 sec. Maybe the answer was wrong and he acted much more impatiently and advanced as though he wants to leave the room when just 15 min had gone by. So overall very disappointed with the behavior of interviewer, and there was no sign of respect. One of the senior engineers asked him to stop from leaving and sit and continue the conversation. Just after that interview I was so sure, whether I get an offer or not I can't work with this team (people). Overall I would say, there is energy at work, but people need to keep there attitude in check. When you are interviewing other candidates, remember that you are presenting your company to a person outside. All the staff in their office is very new and lacks professionalism.