Why can't a Priority Queue wrap around like an ordinary Queue? Last Updated : 06 Sep, 2022 Comments Improve Suggest changes Like Article Like Report Priority Queue: A priority queue is a special type of queue in which each element is assigned a priority value. And elements are served based on their priority. This means that elements with higher priority are served first. However, if elements with the same priority occur, they will be served in the order in which they were queued. A priority queue can be implemented using an array, a linked list, a heap data structure, or a binary search tree. Among these data structures, the heap data structure provides an efficient implementation of priority queues. Queue Implementation with Array and Wrap Around: A queue can be implemented using an array: adding and removing takes O(1) timesize is limitedneed to monitor where the start and end of the queue is in the fieldthe queue can eventually "wrap around" the end of the field - it's not a problem, but just a special case that should be dealt withWhat is Wrap Around? In a circular queue, To solve the problem of not being able to insert an item even if the queue is not full, the front and back arrows of the queue wrap around the beginning of the field as shown in the figure. This is called a ring queue or ring buffer. Note that after the back arrow is wrapped, it is now below the front arrow, i.e. the reverse of the original arrangement. Fig 1.1 Wrap AroundWhy can't a priority queue wrap around like an ordinary queue?The most common implementation of a priority queue is a binary heap, which would not benefit from wrapping. You could create a priority queue that is implemented in a ring buffer, but performance would suffer. It is important to note that a priority queue is an abstract data structure. It defines the operations but not the implementation. You can implement a priority queue as a binary heap, sorted array, unsorted array, binary tree, skipped list, linked list, etc. There are many different ways to implement a priority queue. A binary heap, on the other hand, is a specific implementation of the priority queue abstract data type. Regarding stack vs queue, actually, stacks and queues are just specializations of the priority queues. If you think of time as a priority, then what we call a queue (a FIFO data structure) is actually a priority queue in which the oldest item has the highest priority. A stack (LIFO data structure) is a priority queue in which the newest item has the highest priority. Comment More infoAdvertise with us Next Article Why can't a Priority Queue wrap around like an ordinary Queue? A Akash7 Follow Improve Article Tags : Queue DSA cpp-priority-queue Practice Tags : Queue Similar Reads What is Priority Queue | Introduction to Priority Queue A priority queue is a type of queue that arranges elements based on their priority values. Each element has a priority associated. When we add an item, it is inserted in a position based on its priority.Elements with higher priority are typically retrieved or removed before elements with lower prior 6 min read Why does Queue have front but Priority-queue has top in stl? Why does the queue have front but the priority queue has top in stl? The main difference between a queue and a priority queue is that a queue follows the FIFO (First-In-First-Out) principle, while a priority queue follows a specific priority order. In other words, the elements in a queue are process 8 min read priority_queue::push() and priority_queue::pop() in C++ STL In C++, priority_queue::push() and priority_queue::pop() methods are used to insert and delete the element from the priority_queue container. They both are the member functions of std::priority_queue class defined inside <queue> header file. In this article, we will learn about priority_queue: 2 min read Turn a Queue into a Priority Queue What is Queue?Queue is an abstract data type that is open at both ends. One end is always used to insert data (enqueue) which is basically the rear/back/tail end and the other which is the front end is used to remove data (dequeue). Queue follows First-In-First-Out (FIFO) methodology, i.e., "the dat 9 min read priority_queue::empty() and priority_queue::size() in C++ STL Priority queues are a type of container adaptors, specifically designed such that the first element of the queue is either the greatest or the smallest of all elements in the queue. However, in C++ STL (by default) the largest element is at the top. We can also create a priority queue having the sma 4 min read Like