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A comment on Ask HN: Can engineers from Google or Facebook solve whiteboard questions easily?. Parent comment
Secondly, you are not inventing any algorithm there. You are only using algorithm invented by others.
Thirdly, you are only deciding what solution works better.
Lastly, in an interview you have to invent this algorithm in 45 minutes.
None of this involves you to invent a new algorithm. At least not in 45 minutes. I doubt if the person giving that talk himself did it so quickly.
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Secondly, you are not inventing any algorithm there. You are only using algorithm invented by others.
Thirdly, you are only deciding what solution works better.
Lastly, in an interview you have to invent this algorithm in 45 minutes.
None of this involves you to invent a new algorithm. At least not in 45 minutes. I doubt if the person giving that talk himself did it so quickly.