Priority queues are of 2 types, i.e., Ascending and Descending.The FIFO Rule governs queue data structures.We add an element to the back end of the queue data structure and delete an element from the front end.The time complexity of a double-ended queue is O(1) for insertion and deletion.can further be divided into 2 special queues, i.e., Input-restricted Deque and Output-Restricted Deque.A Double-ended Queue, or Deque, is a different type of queue where enqueue (insertion) and dequeue (deletion) operations are performed at both the ends, i.e., the rear-end (tail) and the front-end (head).More information can be found at Priority Queue in Data Structure. Descending Order: In this priority queue, the elements are arranged in descending order of their priority, i.e., the element with the greatest priority is at the start and the element with the smallest priority is present at the end of the queue.įor insertion and deletion, the priority queue has a time complexity of O(logn).Ascending Order: In this priority queue, the elements are arranged in ascending order of their priority, i.e., the element with the smallest priority comes at the start, and the element with the greatest priority comes at the end.Establish a correspondence between the min and max single-ended priority queues. No element is in both the min and max single-ended priority queue. Remaining elements are in the single-ended priority queues, which may be of different size. More information can be found at Circular Queue in Data Structure.Ī priority queue also exhibits similar characteristics to that of a simple queue where each element is assigned a particular priority value, where elements in the queue are assigned based on priority. Use a min and a max single-ended priority queue.The time complexity of a circular queue is O(1) for insertion and deletion. ![]() It is known that a Queue follows the First-In-First-Out algorithm, but sometimes the elements of the queue are needed to be processed according to the priority, that’s when the PriorityQueue comes into play.
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