Amazon Software Development Engineer interview questions

First with a phone interview. Ask questions about basic data structures, time complexities etc. Then followed by a coding question. I was write the code with a shared pad with the interviewer. It took 45 mins. After one month is the onsite interview. From 10:45am to 4:30pm. I first make a presentation about my previous work. Then followed by 5 rounds of back to back technical interview. Each interview required writing code on the whiteboard. Need to analyze complexity of each code.