Quicksort 1 – Partition in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct]

Hello Programmers/Coders, Today we are going to share solutions of Programming problems of HackerRank, Algorithm Solutions of Problem Solving Section in Java. At Each Problem with Successful submission with all Test Cases Passed, you will get an score or marks. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for Quicksort 1 – Partition in Java-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.

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Introduction To Algorithm

The word Algorithm means “a process or set of rules to be followed in calculations or other problem-solving operations”. Therefore Algorithm refers to a set of rules/instructions that step-by-step define how a work is to be executed upon in order to get the expected results. 

Advantages of Algorithms:

  • It is easy to understand.
  • Algorithm is a step-wise representation of a solution to a given problem.
  • In Algorithm the problem is broken down into smaller pieces or steps hence, it is easier for the programmer to convert it into an actual program.

Link for the ProblemQuicksort 1 – Partition– Hacker Rank Solution

Quicksort 1 - Partition – Hacker Rank Solution


image 119
image 120

Sample Input

STDIN       Function
-----       --------
5           arr[] size n =5
4 5 3 7 2   arr =[4, 5, 3, 7, 2]

Sample Output

3 2 4 5 7


image 121
Quicksort 1 - Partition – Hacker Rank Solution
import java.util.Scanner;

 * @author Techno-RJ
public class Quicksort1Partition {

	public static void partition(int[] a, int lo, int hi) {
		int i = lo;
		int j = hi + 1;
		while (hi > lo) {
			while (a[++i] < a[lo])
				if (i == hi)
			while (a[--j] > a[lo])
				if (j == lo)
			if (i >= j)
			swap(a, i, j);

		swap(a, lo, j);

	private static void swap(int array[], int i, int j) {
		int temp = array[j];
		array[j] = array[i];
		array[i] = temp;

	public static void printArray(int a[]) {
		for (int i = 0; i < a.length; i++)
			System.out.print(a[i] + " ");

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int a[] = new int[N];
		for (int i = 0; i < N; i++) {
			a[i] = sc.nextInt();
		partition(a, 0, a.length - 1);


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