Amazon Software Development Engineer/Software Development Engineer Test interview questions

Got contacted by HR after the job fair, telling me to finish Online Test. After the test, about 2 weeks, I was told that they want to invite me to go to Seattle for the onsite interview. On the onsite day, I talked with four 3 normal interviewers and 1 bar raiser. All the questions are based on CC book, except for the one given by the bar raiser. I did not do well in the second round and third round, which make me fail this opportunity. Due to the NDA, I cannot tell the problem. But, They were not hard. I had 4 problems: one is to solve dependency sequence, one is to solve logic problem (given a function which this to implement another function), one is to solve Tree maximum path problem, and one is to solve anagram problem.