I faced a similar experience, as highlighted by one of the fellows above.

The live coding round was scheduled with an interviewer, and they were impressed with my approach and coding solution. They also asked follow-up questions, which I answered comfortably. The interviewer seemed very positive and mentioned that HR would share feedback in 2-3 days.

I waited optimistically for the feedback. After a month, I received a rejection email from HR without any specified reason.

When I asked for detailed feedback about the reason for rejection, I received no response from HR.

This was a very unprofessional HR team. Please be careful before applying here.

Advice to HR: Please don't waste candidates' time. If you don't have a justified reason for rejection, then show professional ethics by acknowledging it.

Basic DS questions on stack and map.