Amazon SDE - 1 interview questions

The interview started with a little introduction from both side's, and then the interviewer asked about a project I am proud of after which we jumped to DSA they gave a binary tree question which was a medium-level question, continuing with a Hard Array question since I was not able to answer the tree one correctly.

there are 4 rounds first screen , then 3 dsa and then bar raiser which is also hr round ,before this is oa, oa got cleared but messed screeen round