Amazon Applied Scientist interview questions

Data structure and algorithms. The phone interview lasts for 40 minutes. No questions on my background and research. All questions are about data structure and algorithm. Then online coding session. Only one question about 3 sum from 3 arrays. How to find three element from 3 arrays that have sum of 0. What's the time complexity and space complexity of your algorithm.

i have been referred by a friend. HR called me after 2-3 days and set up an interview with one of the Data Scientists for next week. The interview took 1 hour and he asked about 10 questions, mostly fundamental questions. The interviewer was ok, not so friendly though. still waiting for their feedback.