Amazon Software Development Engineer I Intern interview questions

No interest in background, resume, or past projects. Both interviewers seemed disinterested and standoffish. Jumped right into the coding questions, which were typical questions on data structures, searching, and sorting. The first interviewer seemed unsatisfied by my initial answers but didn't say why, which threw me off. The second interviewer was a bit more verbose and seemed better prepared for the interview overall. It wasn't quite an amazing experience, but it wasn't altogether terrible either.

On campus interview. No phone screening. Got interview based on resume. There were two interviewers. There was no specific questions for any language. Each interview lasted 45 minutes. Both interviewers asked about the most challenging task that you have done in the past. Also why join Amazon ?