Received automated emails from the GABI bot to schedule the first round (DS, Algo) for an hour.

Why would you ask such difficult questions for a frontend role? Why is a backend engineer interviewing for a frontend role?

I solved both problems in the interview. No feedback or update even after four days. I sent an email, but received no update. I called HR, and they said, "We have already filled this position now."

No courtesy to inform. No apology. From this whole terrible experience, it looks like they were just in a mood to waste my time.

Find the maximum sum between any two leaf nodes in a tree.

Given an m x n matrix of characters and an array of words, find which words can be created in the matrix. You can start from any character in the matrix and traverse in any of the 8 adjacent directions. Repeating the same (i, j) position is not allowed for a given word.