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. 

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 ProblemPicking Numbers – Hacker Rank Solution

Picking Numbers – Hacker Rank Solution


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


image 70

Function Description

Complete the pickingNumbers function in the editor below.

pickingNumbers has the following parameter(s):

  • int a[n]: an array of integers


  • 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].

image 71

Sample Input 0

4 6 5 3 3 1

Sample Output 0


Explanation 0

image 72

Sample Input 1

1 2 2 3 1 2

Sample Output 1


Explanation 1

image 73
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[101];
		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) {

		int result = pickingNumbers(list);


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