Google Software Development Engineer SDE II interview questions

I was given a behavioral assessment which i pass. After passing, i was contacted by a recruiter to start the process of the four round panel interview. For the four round, i was given a whole month to prepare. The first 3 rounds are technical and they can very from medium to hard on leetcode level. The first one was recursion, the second round was a tree/graph and the third round was map/string. The last round was the googliness and that was behavioral.