Answer:
the answer is O(1)
Explanation:
A priority queue is a type of queue whereby each of the elements are linked with a priority and the elements are served according to their priority.
The word enqueue means to add elements to the back of the queue
For this question, while using an unordered list, O(1) is the big-O complexity of the enqueue operation. O(1) is a natural Choice for queues.
