C program to implement quick sort

In 3 Way QuickSort, an array arr[l.. See this for implementation. How to implement QuickSort for Linked Lists? Yes, please refer Iterative Quick Sort. Allocating and de-allocating the extra space used for merge sort increases the running time of the algorithm. Comparing average complexity we find that both type of sorts have O NlogN average complexity but the constants differ. For arrays, merge sort loses due to the use of extra O N storage space.

Most practical implementations of Quick Sort use randomized version. The randomized version has expected time complexity of O nLogn. Quick Sort is also a cache friendly sorting algorithm as it has good locality of reference when used for arrays. Quick Sort is also tail recursive, therefore tail call optimizations is done. Skip to content. Change Language. Related Articles. Table of Contents. Improve Article. Save Article. Like Article. Pseudo Code for recursive QuickSort function :. Previous Merge Sort.

Next HeapSort. Recommended Articles. Currently you have JavaScript disabled. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. Click here for instructions on how to enable JavaScript in your browser. Skip to content Quick Sort is an efficient sorting algorithm developed by Tony Hoare in Quick Sort Algorithm Quick sort is a divide and conquer algorithm which is generally implemented using recursive function.

Select an element from the array as pivot. Partition the array. One partition will have all the elements that are smaller than the pivot. Another partition will have other elements that are greater than the pivot. Apply this procedure recursively with these two partitions. First element of the partitions is selected as pivot. Last Element of the partitions is selected as pivot. Random element of the partitions is selected as pivot.

Median of first, middle and last element of the partition is selected as pivot. Graphical Illustration of Quick Sort The diagram above shows how quick sort works. The diagram below shows an experimental result how quick sort performs in various conditions.

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