Doubly Ended Queue (DQueue)
A Doubly Ended Queue, often abbreviated as Deque, is a linear data structure that allows for the efficient insertion and deletion of elements at both ends of the queue. In a Deque, you can add or remove elements from the front (head) or the back (tail) of the queue. It combines the characteristics of both a stack (Last-In, First-Out) and a queue (First-In, First-Out) in a single data structure.
Here are some key features and operations associated with a Doubly Ended Queue:
Insertion at Front and Back: You can insert elements at both the front and back of the Deque. These operations are commonly known as push_front (insert at the front) and push_back (insert at the back).
Removal from Front and Back: You can remove elements from both the front and back of the Deque. These operations are commonly known as pop_front (remove from the front) and pop_back (remove from the back).
Access: You can access elements from both ends of the Deque without removing them. This is often done using functions like front() to access the element at the front and back() to access the element at the back.
Size: You can determine the number of elements in the Deque using a size() or length() function.
Empty: You can check if the Deque is empty or not using an empty() function.
Applications: Deques are used in scenarios where elements need to be efficiently added or removed from both ends, such as implementing double-ended queues, sliding window algorithms, and more.
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