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But how does the company recruiting you know that you are actually doing the work, and not having someone else do it.

The purpose of data structures and algorithms questions is to demonstrate some abstract thinking and coding ability in a short space of time - if you can do that you can probably code in whatever language / framework they use.

Brainteaser questions on the other hand, those are worthless.

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That is a genuine concern, however what would be the point, within hours of me starting my first project with them it would become obvious that I could not do my job & end up being fired. Lose Lose for everyone.

Also, having been on the interviewers side of the table - I think as soon as a candidate & I begin discussing his code & technical choices, it becomes obvious if he did the work himself i.e. can he talk in depth about the stack he used, any algorithms, schema decisions etc... or does he just give short "I'm hiding from your question" type answers.

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