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Which of the following sorting algorithm is used by C++ internally?

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Which of the following sorting algorithm is used by C++ internally?

(a) quicksort

(b) introsort

(c) merge sort

(d) heap sort

The question was asked during a job interview.

I'm obligated to ask this question of Sorting topic in section Sorting of Data Structures & Algorithms II

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Right option is (b) introsort

Easy explanation - Introsort is the in built sorting algorithm used by C++. It is an example of a hybrid sorting algorithm which means it uses more than one sorting algorithm as a routine.

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