The base case of the recursion is arrays of size 1, which never need to be sorted. Recur: Recursively apply the above steps to the subarray of elements with smaller values than the pivot and separately to the subarray of elements with greater values than the pivot.After this partitioning, the pivot is in its final position. In contrast, all elements with values greater than the pivot come after it. Partitioning: Reorder the array such that all elements with values less than the pivot come before the pivot.Pivot selection: Pick an element, called a pivot, from the array (usually the leftmost or the rightmost element of the partition).Basically, three steps are involved in the whole process: Like all divide-and-conquer algorithms, it first divides a large array into two smaller subarrays and then recursively sort the subarrays. Quicksort is a Divide and Conquer algorithm. In the worst-case, it makes O(n 2) comparisons, though this behavior is very rare. Quicksort, on average, makes O(n.log(n)) comparisons to sort n items. In efficient implementations, it is usually not a stable sort. Quicksort is a comparison sort, meaning that it can sort items of any type for which a less-than relation is defined. Quicksort is an efficient in-place sorting algorithm, which usually performs about two to three times faster than merge sort and heapsort when implemented well. Given an integer array, sort it using the Quicksort algorithm.
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December 2022
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