why should we use double pointer in queue
时间: 2024-05-27 16:11:25 浏览: 16
Double pointers are used in queues to maintain the front and rear pointers of the queue. A queue is a data structure that follows the First-In-First-Out (FIFO) principle. It is used to store elements that are waiting to be processed.
In a queue, we need to maintain two pointers, front and rear. The front pointer points to the first element in the queue, and the rear pointer points to the last element in the queue. When we add an element to the queue, we add it to the rear end, and when we remove an element from the queue, we remove it from the front end.
To maintain these pointers, we use double pointers. A double pointer is a pointer that points to another pointer. In a queue, we use double pointers to store the addresses of the front and rear pointers. This enables us to modify the front and rear pointers when we add or remove elements from the queue.
Using double pointers in a queue also helps in reducing the overhead of creating and deleting nodes in the queue. Instead of creating a new node every time we add an element, we can simply modify the rear pointer to point to the new element. Similarly, when we remove an element, we can simply modify the front pointer to point to the next element in the queue.
Overall, using double pointers in a queue provides a more efficient and convenient way of managing the front and rear pointers, making the queue operations faster and more streamlined.
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