## 03 Dec Java Dequeue

Hello Friends, How are you? Today I am going to solve the **HackerRank Java Dequeue Problem** with a very easy explanation. In this article, you will get more than one approach to solve this problem. So let’s start- **{tocify} $title={Table of Contents}** 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(); Deque deque = new ArrayDeque();

You can find more details about Deque here. In this problem, you are given N integers. You need to find the maximum number of unique integers among all the possible contiguous subarrays of size M. Note: Time limit is 3 seconds for this problem. The first line of input contains two integers N and M: representing the total number of integers and the size of the subarray, respectively. The next line contains N space-separated integers.

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