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by why-el 2617 days ago
I see your point, and usually these work best if the interviewer can prove that such a thing is needed. For instance, many jobs might require sorting of data that cannot fit on disk (think for instance of loading a massive file that you want to parse, and sorting might help you in processing it), in which case knowing merge sort (the disk variety) can help. So yes, the onus is on the interviewer I think.