Institution: SONALI BANK LTD Exam: Sonali Bank Ltd - Assistant Programmer - 26.08.2016 ||
Topic: ICT (তথ্য ও যোগাযোগ প্রযুক্তি), Subject: Computer and ICT (তথ্য ও যোগাযোগ প্রযুক্তি)

Best Answer Explained in Below-:

The correct answer for implementing a priority queue from the provided options is actually not A) Dequeue, but rather B) Heap. A priority queue is an abstract data type where each element has a priority assigned to it, and elements are dequeued based on their priority rather than just their order of arrival.

A heap, specifically a binary heap, is particularly well-suited for this task because it allows for efficient insertion of elements and optimal extraction of the highest (or lowest) priority element. Both operations can be performed in O(log n) time, making it an efficient choice for managing priorities.

While a double-ended queue (Dequeue) allows for inserting and removing items from both ends, it does not inherently manage priorities among its elements. A standard queue only operates on a first-in-first-out basis without prioritization. So, while Dequeues and arrays can be utilized in specific implementations of a priority queue, heaps are the most efficient and suitable data structure, as they systematically organize data based on priorities, ensuring quick access to the highest (or lowest) priority items.