This answer about in-place in quick sort tells that quick sort is not in-place.
But, mit-ocw lecture of quick sort tells that quick sort is in-place. MIT Lecture
What is right answer? In-place or not?
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3Possible duplicate of [Is Quicksort in-place or not?](https://stackoverflow.com/questions/22028117/is-quicksort-in-place-or-not) – Rivasa May 28 '18 at 00:46
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@Annabelle I saw that answer. It is not duplicate – molamola May 28 '18 at 00:49
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Also duplicate of [Is imperative Quicksort in situ (in-place) or no?](https://stackoverflow.com/q/9096787/62576) – Ken White May 28 '18 at 01:00
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@haram Yes, it is. – Rivasa May 28 '18 at 01:26