There were two different rounds. In the first round, a question about merging lists with a given API was asked. I implemented the working solution correctly within the given time complexity. In the second round, another question about an array was asked, which I later figured out was a standard GeeksforGeeks trick question. I implemented the solution with the required time complexity.

I asked the interviewer if they wanted to ask any more questions, and they said no. After the second round, I was told they did not want to proceed without giving any proper explanation. This is really unprofessional and unethical.

Don't get me wrong; I've been rejected by interviews before, but in every one of them, there were valid reasons, like not solving a question correctly (and being shown the correct solution) or the company not being able to sponsor a visa at that time. However, rejecting a candidate who solved both questions correctly and without proper explanation is highly unprofessional.

tl;dr: Don't waste your time giving interviews for an unprofessional company. I should have come here before and read the other reviews before wasting my time. You will not learn anything new from the interviews, and they will just reject you whimsically.

You can practice Geekforgeeks questions, but even if you solve them, they might reject you.