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Can anyone please tell me that which type of sorting technique (bubble, insertion, selection, quick, merge, count...) is implemented in the std::sort() function defined in the <algorithm> header file?
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The std::sort is a sorting function that uses the Introsort algorithm and have the complexity of O(N log(N)) where N= std::distance(first, last) since C++11 and the order of equal elements is not guaranteed to be preserved[3]. The gcc-libstdc++ also uses Introsort algorithm.
std::sort is most likely to use QuickSort, or at least a variation over QuickSort called IntroSort, which "degenerates" to HeapSort when the recursion goes too deep.
Sorting is the process of arranging elements either in ascending (or) descending order.
Most implementations of std::sort use quicksort, (or usually a hybrid algorithm like introsort, which combines quicksort, heapsort and insertion sort).
The only thing the standard requires is that std::sort somehow sort the data according to the specified ordering with a complexity of approximately O(N log(N)); it is not guaranteed to be stable. Technically, introsort better meets the complexity requirement than quicksort, because quicksort has quadratic worst-case time.
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