Very negative experience. The interviewer was six minutes late and did not apologize for the delay. It was clear from the beginning that he was in a hurry and the interview was not interesting to him. He did not quite well understand the solutions that I suggested, and we spent quite a long time just to explain how I was going to solve it. Maybe I did not explain it well, but I am sure it was because he had no interest in the interview and did not follow what I was talking about.

As a result, I spent a pretty long time on a medium coding question. In the middle of the interview, the interviewer disappeared for five minutes (!!) and I talked with no one. Eventually, I solved both problems and suggested optimizations, but it looks like the time and the overall interviewer's negativity were critical factors, and as expected, I got rejected. I have not had such an unprofessional phone interview for a long time.

Standard questions from LeetCode. They don't expect you to think; they expect you to know. Even the recruiters tell you to imagine the interview as a kind of college exam.