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It went well. I was nervous, but I gained confidence in the end. It was a nice experience and seemed like a once-in-a-lifetime opportunity. It gave me motivation for the future.

Okayish, but overall a pretty good experience. Please do attend it yourself. You will get a good experience and also learn the important questions that will be asked in an interview.

Come in, dig over the CV, and go straight up to the board. Start solving the question in whichever programming language you want. You'll need to explain about computing speed, memory requirements, tradeoffs, etc.