# Picking Numbers 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 ProblemPicking Numbers – Hacker Rank Solution

`Picking Numbers – Hacker Rank Solution`

### Problem:

Given an array of integers, find the longest subarray where the absolute difference between any two elements is less than or equal to .

Example

Function Description

Complete the pickingNumbers function in the editor below.

pickingNumbers has the following parameter(s):

• int a[n]: an array of integers

Returns

• int: the length of the longest subarray that meets the criterion

Input Format

The first line contains a single integer n, the size of the array a.
The second line contains n space-separated integers, each an a[i].

Sample Input 0

```6
4 6 5 3 3 1
```

Sample Output 0

```3
```

Explanation 0

Sample Input 1

```6
1 2 2 3 1 2
```

Sample Output 1

```5
```

Explanation 1

`Picking Numbers – Hacker Rank Solution`
```import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.Set;

/**
* @author Techno-RJ
*
*/
public class PickingNumbers {

public static int pickingNumbers(List<Integer> a) {
int frequency[] = new int;
int result = Integer.MIN_VALUE;

for (int i = 0; i < a.size(); i++) {
int index=a.get(i);
frequency[index]++; //frequency[index]=frequency[index]+1
}

for (int i = 1; i <= 100; i++) {
result = Math.max(result, frequency[i] + frequency[i - 1]);
}
return result;

}

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
List<Integer> list = new ArrayList<>();
while (n-- > 0) { 