Illustrates the program segment for Quick sort. It uses recursion.

Program 1: Quick Sort

Quicksort(A,m,n)

int A[ ],m,n

{

int i, j, k;

if m

{

i=m; j=n+1; k=A[m]; do

do

do

++i;

while (A[i] < k);

do

--j;

while (A[j] > k);

if (i < j)

{

temp = A[i];

A[i] = A[j];

A[j] = temp;

}

while (i

temp = A[m];

A[m] = A[j];

A[j] = temp;

Quicksort(A,m,j-1);

Quicksort(A,j+1,n);

}

The Quick sort algorithm uses the O(N Log₂N) comparisons on average. The performance can be developed by keeping in mind the following points.

1.         Switch to a faster sorting scheme such as insertion sort while the sublist size becomes comparatively small.

2.      Employ a better dividing element in the implementations.