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Sorry to hear dude. I've interviewed tons of people and I've had the brightest guys mess these things up. As an interviewer try to see if you can describe the problem instead of asking for definitions. As an interviewee, say what does come to mind and kindly ask for a hint. Even if you technically mess up the question you can often make up for it at least partially in social skills. Seriously, that happens on the job too and then you ask your local ai model about it.. Unless of course there was another candidate that just aced everything... In any case, don't get upset over it and keep a positive attitude. You'll get your job!