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

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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.

• 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`

### Problem:

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
```

Explanation

`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)
break;
while (a[--j] > a[lo])
if (j == lo)
break;
if (i >= j)
break;
swap(a, i, j);

}
swap(a, lo, j);
printArray(a);
}

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);
sc.close();

}
}``` 