A deque can be thought of as an array of items, but with one important difference: Instead of pushing and popping items off the end to make room, deques are designed to allow items to be inserted at either end. This property makes deques well-suited for performing tasks such as keeping track of inventory, scheduling tasks, or handling large amounts of data.
There are two types of deque:
- Input Restricted Deque: Insertion operations are performed at only one end while deletion is performed at both ends in the input restricted queue.
- Output Restricted Deque: Deletion operations are performed at only one end while insertion is performed at both ends in the output restricted queue.
Following are some real-time applications for deque data structure:
- It can be used as both stack and queue, as it supports all the operations for both data structures.
- Web browser’s history can be stored in a deque.
- Operating systems job scheduling algorithm
