Problem 1: https://leetcode.com/problems/diameter-of-binary-tree/
Problem 2- https://leetcode.com/problems/boundary-of-binary-tree/

i was able to solve the first one and the second one partially. i got the feedback that i have cleared the first round.

1. FB mainly check for the approach that you take in solving the alogirthm rather than complete output.
2. Time and Space Compelxity is very important.
3. Make sure that you are explaining the logic of the algorithm.