Amazon Software Engineer interview questions

The recruiter contacted me months ago. But I was in an internship at that time. So I postponed it initially. In the beginning, it was a phone interview from the recruiter about basic questions regarding my past experience, my desire rate and so on. The first technical interview followed up in a week. It's about hash and B tree. I was required to answer the questions via an online webpage, which was so beyond my imagination, so I didn't do it well. That's the end of it.