PRGM::::4


import java.util.Scanner;

import java.util.Arrays;

import java.util.Random;

public class QuickSortComplexity 

 {

static final int MAX = 10005;

static int[] a = new int[MAX];

public static void main(String[] args) 

 {

Scanner input = new Scanner(System.in);

System.out.print("Enter Max array size: ");

int n = input.nextInt();

Random random = new Random();

System.out.println("Enter the array elements: ");

for (int i = 0; i < n; i++)

 //a[i] = input.nextInt(); // for keyboard entry

a[i] = random.nextInt(1000); // generate 

 // random numbers – uniform distribution

a = Arrays.copyOf(a, n); // keep only non zero elements

Arrays.sort(a); // for worst-case time complexity

System.out.println("Input Array:");

for (int i = 0; i < n; i++)

System.out.print(a[i] + " ");

 // set start time

long startTime = System.nanoTime();

QuickSortAlgorithm(0, n - 1);

long stopTime = System.nanoTime();

long elapsedTime = stopTime - startTime;

System.out.println("\nSorted Array:");

for (int i = 0; i < n; i++)

System.out.print(a[i] + " ");

System.out.println();

System.out.println("Time Complexity in ms for n=" + n + " is: " + 

(double) elapsedTime / 1000000);

 }

public static void QuickSortAlgorithm(int p, int r) 

{

int i, j, temp, pivot;

if (p < r) 

 {

i = p;

j = r + 1;

pivot = a[p]; // mark first element as pivot

while (true) 

 {

i++;

while (a[i] < pivot && i < r)

i++;

j--;

while (a[j] > pivot)

j--;

if (i < j) 

 {

temp = a[i];

a[i] = a[j];

a[j] = temp;

} else

break; // partition is over

 }

a[p] = a[j];

a[j] = pivot;

QuickSortAlgorithm(p, j - 1);

QuickSortAlgorithm(j + 1, r);

}

}

}


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