Quick sort, Data Structure & Algorithms

Assignment Help:

This is the most extensively used internal sorting algorithm. In its fundamental form, it was invented by C.A.R. Hoare in the year of 1960. Its popularity lies in the easiness of implementation, moderate use of resources & acceptable behavior for a variety of sorting cases. The fundamental of quick sort is the divide & conquer strategy that means Divide the problem [list to be sorted] into sub-problems [sub-lists], till solved sub problems [sorted sub-lists] are found. It is implemented as follows:

Select one item A[I] from the list A[ ].

Rearrange the list so that this item come to the appropriate position, that means all preceding items have a lesser value and all succeeding items contain a greater value than this item.

1.      Place A[0], A[1] .. A[I-1] in sublist 1

2.      A[I]

3.      Place A[I + 1], A[I + 2] ... A[N] in sublist 2

Repeat steps 1 and step 2 for sublist1 and sublist2 until A[ ] is a sorted list. As can be seen, this algorithm contains a recursive structure.

The divide' procedure is of utmost importance in this algorithm. Usually this is implemented as follows:

1.      Select A[I] as the dividing element.

2.         From the left end of the list (A[O] onwards) scan until an item A[R] is found whose value is greater than A[I].

3.         From the right end of list [A[N] backwards] scan until an item A[L] is found whose value is less than A[1].

4.      Swap A[R] & A[L].

5.      Continue steps 2, 3 & 4 till the scan pointers cross. End at this stage.

6.      At this point, sublist1 and sublist2 are ready.

7.      Now do the same for each of sublist1 & sublist2.


Related Discussions:- Quick sort

State about the simple types - built-in types, State about the Simple types...

State about the Simple types - Built-In Types Values of the carrier set are atomic, that is, they can't be divided into parts. Common illustrations of simple types are inte

Convertion, how we can convert a graph into tree

how we can convert a graph into tree

Graph, Multilist Representation of graph

Multilist Representation of graph

Programs, Develop a program that accepts the car registration( hint: LEA 43...

Develop a program that accepts the car registration( hint: LEA 43242010)

Designed to manage the booking, Beauty Salon is a system to be designed to...

Beauty Salon is a system to be designed to manage the booking and the payment of a single beauty parlour. Beauty Therapists: A beauty parlour has a number of staff members mo

Fifo, give any example of page replacement using fifo and use your own refe...

give any example of page replacement using fifo and use your own reference string

Adjacency list representation, Adjacency list representation An Adjacen...

Adjacency list representation An Adjacency list representation of Graph G = {V, E} contains an array of adjacency lists mentioned by adj of V list. For each of the vertex u?V,

Direct file organisation, It offers an effective way to organize data while...

It offers an effective way to organize data while there is a requirement to access individual records directly. To access a record directly (or random access) a relationship is

State about the pseudocode, State the Introduction to pseudocode No spe...

State the Introduction to pseudocode No specific programming language is referred to; development of algorithms by using pseudocode uses generic descriptions of branching, loop

Data type, Data type An implementation of an abstract data type on a...

Data type An implementation of an abstract data type on a computer. Therefore, for instance, Boolean ADT is implemented as the Boolean type in Java, and bool type in C++;

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd