I have an array of nested objects: [ {_id:1, parent:0, name:'Z'}, {_id:4, parent:0, name:'A'}, {_id:2, parent:1, name:'H'}, {_id:8, parent:2, name:'G'}, {_id:5, parent:4, name:'M'}, {_id:6,...

In answers related to quicksort vs mergesort, it is commonly stated that quicksort exploits cache locality (locality of reference) better than mergesort. As both sorts follow a divide and conquer ...

The following quote is from "Comparison with other sort algorithms" section from Wikipedia Merge Sort page On typical modern architectures, efficient quicksort implementations generally outper...

If possible, how can I improve the following quick sort(performance wise). Any suggestions? void main() { quick(a,0,n-1); } void quick(int a[],int lower,int upper) { int loc; if(lower<...

I'm a new to algorithms and I'm confused as to where are the errors in my code that I'm writing as an assignment. I'm trying to implement a quicksort algorithm in Python 3 that deals with equal val...

Does the following Quicksort partitioning algorithm result in a stable sort (i.e. does it maintain the relative position of elements with equal values): partition(A,p,r) { x=A[r]; i=p-1; for j...

Is it possible for the ordering of the input to affect the performance of Array.sort()? If so, how?

Following code for quicksort does not work and I can't understand what is reason. #include <iostream> using namespace std; void exch(int a[],int i,int j){ int s=a[i]; a[i]=a[j]; a[j]=s; ...

Does partition function gives quick sort its locality of reference ? If it does, how ? I mean what is there in quicksort which gives it locality of reference when compared to other algorithms suc...

I'm trying to implement the quicksort algorithm choosing the pivot as the rightmost element as described in Cormey et al., Introduction to Algorithms: Here is my Python implementation: def part...

I have a homework assignment that reads as follows (don't flame/worry, I am not asking you to do my homework): Write a program that sorts a set of numbers by using the Quick Sort method using a bi...

I have a hard time translating QuickSort with Hoare partitioning into C code, and can't find out why. The code I'm using is shown below: void QuickSort(int a[],int start,int end) { int q=HoarePar...

I know that Java's Arrays.sort method uses MergeSort for sorting arrays of objects (or collections of objects) since it is stable, and Java uses QuickSort for arrays of primitives because we don't ...

I want to implement the QuickSort Algorithm on a sync Doubly Linked List. I give the function "partition" the left and right border, then it starts to search lower values on the left side and put t...

When does the quicksort algorithm take O(n^2) time?

Why quicksort(or introsort), or any comparison-based sorting algorithm is more common than radix-sort? Especially for sorting numbers. Radix-sort is not comparison based, hence may be faster than ...

I found many implementations of quick sort algorithm, but at the end I decided to stick to this one: public static void quickSort(int array[], int start, int end) { if(end <= start || start ...

I'm having a hard time understanding quicksort, most of the demonstrations and explanations leave out what actually happens (http://me.dt.in.th/page/Quicksort/ for example). Wikipedia says: Pic...

here is the of quick sort algorithm from the MITOcw(Introduction To Algorithms ) lecture QUICKSORT(A,p,q) if(p < q) then r = PARTITION(A,p,q) QUICKSORT(A,p,r-1) QUICKSORT(A,r+1,q) PARTITION...

I'm working on a quicksort-variant implementation based on the Select algorithm for choosing a good pivot element. Conventional wisdom seems to be to divide the array into 5-element blocks, take th...

Quicksort is better than mergesort in many cases. But when might mergesort be better than quicksort? For example, mergesort works better when all data cannot be loaded to memory at once. Are there ...

I've noticed a discrepancy in the way quicksort is called recursively. One way is quicksort(Array, left, right) x = partition(Array, left, right) quicksort(Array, left, x-1) quicksort(Array, x...

I was trying to do an implementation of QuickSort (with median of 3 partitioning-element and insertion sort for small arrays) and compare it to an implementation of MergeSort, but even when QuickSo...

Many examples on the web about Quicksort (in Java) are close to this: private void quicksort(int low, int high) { int i = low, j = high; int pivot = numbers[low + (high-low)/2]; while (i <=...

When analyzing QS, every one always refers to the "almost sorted" worst case. When can such a scenario occur with natural input? The only example I came up with is re-indexing.