The interview process was good. The questions were interesting, and the interviewers collaborated with you to find solutions.

The issue is that they are too selective, and you can even be rejected after reaching the final interview with the manager.

Another issue is that HR keeps asking the same questions for five years. Someone can use this to their advantage, and recruiters might say, "Oh, someone made it faster than you because they memorized it!"

Q: Implement a set collaboratively, step by step, in terms of optimization.