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I'm a recent grad, I like to keep track of interview questions. Personally I've been asked dozens of whiteboard questions across a number of companies. I have friends who have interviewed at countless places. I don't know a single person who has been asked a red black tree question.

Where do these get asked.

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I was asked a question like that once and knew the general details but was quizzed on the specifics - needless to say I did not get the job and my elementary knowledge about red-black trees was specifically mentioned as a reason for my rejection. This was at a highly publicised tech startup that people consider a very good employer in the industry.

What year?

This was this year, a couple months ago.

Apple, though that was one interviewer and a few years ago.

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