The choice of implementation depends on the specific requirements and performance characteristics desired for your application. It's worth noting that while the implementation above uses a list, there are alternative implementations of queues using other data structures such as arrays, linked lists, or circular buffers. You can use this implementation to create a queue object and perform queue operations like enqueue, dequeue, peek, check if it's empty, or get its size. The size method returns the number of elements in the queue. The peek method returns the first item without removing it. The dequeue method removes and returns the first item in the list. The enqueue method adds an item to the end of the list. Interface to specify a FIFO Queue import. The is_empty method checks if the queue is empty by verifying if the list has no items. In this implementation, the items list is used to store the elements of the queue. The time complexity of a simple queue is O(1) for insertion and deletion operations. Insertion takes place at one end, i.e., the rear end or the tail of the queue, and deletion takes place at the other end, i.e., the front end or the head of the queue. Think of it as a line of people waiting, where the person who arrives first gets served first. Simple Queue: In a simple queue, we follow the First In, First Out (FIFO) rule. Double Ended Queue (Deque) Priority Queue. They are: Input Restricted Queue (this is a Simple Queue) Output Restricted Queue (this is also a Simple Queue) Circular Queue. It is a collection of elements where the first element added is the first one to be removed. Types of Queues: There are five different types of queues that are used in different scenarios. A linked list can also be used to implement a queue, but we must maintain both a head and a tail pointer because we need access to both the front and the rear of the queue.A Queue is another common Abstract Data Type (ADT) that follows the First-In-First-Out (FIFO) principle.â¦by putting it at location 0 (if that location is not already used).In this example, suppose we want to add the number 4 to the queue. An array implementation of a queue must have special behavior when the rear of the queue reaches the end of the array.For a dynamic array, we could increase the size of the array when the queue grows beyond the current array size. In the above image, since 1 was kept in the queue before 2, it is the first to be removed from the queue as well. Once we import this file, we can create a queue using the following syntax: queue q Here, type indicates the data type we want to store in the queue.Some examples in this category include: Store the. In order to create a queue in C++, we first need to include the queue header file. For a fixed size array, a new item may enter only if the current size of the queue is less than the size of the array. Queues are also used as buffer where the order of processing is dictated by First in First out (FIFO) manner.
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