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Gotta love the state of today where "I need to solve a basic state-execution flow" translates to "Let's pay a third-party service to do it".

Almost makes me forgive the interview process tech-companies demand just to check dev's can actually cover the basics.

To be fair, I haven't come across an interview where knowledge like this is checked.

Which is sad, this is more likely a bit of information a dev would need to know, instead of inverting a binary tree.