Why is quicksort called so? Is it the best algorithm for sorting in terms of time? Also which algorithm is used in the inbuilt sort function in c++?

[gaganwalia212 (Gagan Walia)]

Why is quicksort called so? Is it the best algorithm for sorting in terms of time? Also which algorithm is used in the inbuilt sort function in c++?

[asaurabh_26 (logical coder)]

@gaganwalia212

Why is quicksort called so?

C. A. R Hoare himself named it quick sort when he published the paper. When implemented well, it can be about two or three times faster than its main competitors, merge sort and heapsort . So it made sense naming it quick sort.

@gaganwalia212

Is it the best algorithm for sorting in terms of time?

The time complexity of Quicksort is O(n log n) in the best case, O(n log n) in the average case, and O(n^2) in the worst case. But because it has the best performance in the average case for most inputs, Quicksort is generally considered the “fastest” sorting algorithm

@gaganwalia212

Also which algorithm is used in the inbuilt sort function in c++?

C++ sort function uses introsort which is a hybrid algorithm. Different implementations use different algorithms. The GNU Standard C++ library, for example, uses a 3-part hybrid sorting algorithm: introsort is performed first (introsort itself being a hybrid of quicksort and heap sort) followed by an insertion sort on the result.