Java Dequeue Hacker Rank Solution

Hello coders, In this post, you will learn how to solve Java Dequeue Hacker Rank Solution. This problem is a part of the Java programming series. One more thing to add, don’t straight away look for the solutions, first try to solve the problems by yourself. If you find any difficulty after trying several times, then look for the solutions.

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Java Dequeue Hacker Rank Solution

Problem

In computer science, a double-ended queue (dequeue, often abbreviated to deque, pronounced deck) is an abstract data type that generalizes a queue, for which elements can be added to or removed from either the front (head) or back (tail).

Deque interfaces can be implemented using various types of collections such as LinkedList or ArrayDeque classes. For example, deque can be declared as:

Deque deque = new LinkedList<>();
or
Deque deque = new ArrayDeque<>();

You can find more details about Deque here.

In this problem, you are given  integers. You need to find the maximum number of unique integers among all the possible contiguous subarrays of size .

Note: Time limit is  second for this problem.

Input Format

The first line of input contains two integers  and : representing the total number of integers and the size of the subarray, respectively. The next line contains  space separated integers.

Constraints

The numbers in the array will range between .

Output Format

Print the maximum number of unique integers among all possible contiguous subarrays of size .

Sample Input

6 3
5 3 5 2 3 2

Sample Output

3

Java Dequeue Hacker Rank Solution

import java.util.*;
public class test {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Deque deque = new ArrayDeque<>();
        HashSet<Integer> set = new HashSet<>();
        int n = in.nextInt();
        int m = in.nextInt();
        int max = Integer.MIN_VALUE;
        for (int i = 0; i < n; i++) {
            int input = in.nextInt();
            deque.add(input);
            set.add(input);
            if (deque.size() == m) {
                if (set.size() > max)
                    max = set.size();
                int first = (int) deque.remove();
                if (!deque.contains(first))
                    set.remove(first);
            }
        }
        System.out.println(max);
    }
}

Disclaimer: The above Problem (Java Dequeue) is generated by Hackerrank but the Solution is Provided by Chase2Learn. This tutorial is only for Educational and Learning purposes. Authority if any of the queries regarding this post or website fill the following contact form thank you.

FAQ:

1. HackerRank Java All Problems Solutions

Hackerrank java problems solutions with practical program code examples and step-by-step full complete explanation.

2. Can HackerRank learn Java?

Welcome to the world of Java! In this challenge, we practice printing to stdout. The code stubs in your editor declare a Solution class and the main method. 

3. What is HackerRank Java test?

The HackerRank Skills Certification Test is a standardized assessment to help developers prove their coding skills.

4. Should I put HackerRank certificate on resume?

These certificates are useless, and you should not put them on your resume. The experience you gained from getting them is not useless. Use it to build a portfolio, and link to it on your resume. 

5. Can I retake HackerRank test?

The company which sent you the HackerRank Test invite owns your Test submissions and results. It’s their discretion to permit a reattempt for a particular Test. If you wish to retake the test, we recommend that you contact the concerned recruiter who invited you to the Test and request a re-invite. 

6. Can I learn Java per month?

you can’t master it in 1 month, it needs continuous hard work and experience. JAVA is a vast language even developers don’t know fully. you go in-depth about each particular class in java. Java is such a platform which have been used in all platform like android, web, and cloud so keep working on your interest. 

Where can I find HackerRank solutions in Java?

in this post you will get all the solutions of HackerRank java Problems.

Finally, we are now, in the end, I just want to conclude some important message for you

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