Differentiate between dequeue and priority queue.

To differentiate between a dequeue and a priority queue, we need to understand their definitions and operations.

1. Definition:

   • Dequeue (Double Ended Queue): It is a linear data structure that allows insertion and deletion of elements from both ends.
   • Priority Queue: It is an abstract data type that stores elements along with their priorities and allows the element with the highest priority to be accessed first.

2. Operations:

   • Dequeue:

     • Insertion: Elements can be inserted at both the front and the rear end of the dequeue.
     • Deletion: Elements can be deleted from both the front and the rear end of the dequeue.
     • Access: Elements can be accessed from both ends of the dequeue.
     • Example: If we have a dequeue [1, 2, 3], we can insert 4 at the front end to get [4, 1, 2, 3], or we can delete 3 from the rear end to get [1, 2].

   • Priority Queue:

     • Insertion: Elements are inserted based on their priority. The element with the highest priority is placed at the front of the queue.
     • Deletion: The element with the highest priority is removed from the front of the queue.
     • Access: Only the element with the highest priority can be accessed.
     • Example: If we have a priority queue with elements [(3, high), (1, low), (2, medium)], the element with the highest priority (3, high) will be accessed first.

In summary, a dequeue allows insertion and deletion from both ends, while a priority queue stores elements with priorities and allows access to the element with the highest priority.