Amazon Software Engineer University Grad interview questions

I received an email inviting me to the first part of the OA. I completed it within 3 days of receipt. Personally, it was challenging. I received the second part an hour after completion of the first part. In preparation, I did some LeetCode, but none were similar to the two questions on the second OA. Both were medium to hard, and there wasn't enough time for me to debug. I received a rejection an hour after completion of the second part.