viudge In queue

在给队伍插队的情况下，如果有多个朋友要求插队，你可以安排他们的顺序，每次一个人入队。如果入队的人发现队伍中有自己的朋友，则可以插入到这个朋友的后面。当队伍中的朋友不止一个时，可以按照插队者的要求进行插队。

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相关问题

why should we use double pointer in queue

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.

whu should we use double int pointer in queue

Double int pointer is used in queue to facilitate dynamic memory allocation. When we dynamically allocate memory for a queue, we need to use a double int pointer to create a pointer to a pointer that points to the memory block allocated for the queue. This allows us to create a queue of any size dynamically.

In a queue, we need to keep track of the front and rear elements. When we insert an element into the queue, we need to increment the rear pointer. When we remove an element from the queue, we need to increment the front pointer. Using a double int pointer allows us to modify the front and rear pointers by dereferencing the pointer to the pointer.

Additionally, using a double int pointer allows us to pass the queue to functions by reference. This allows the function to modify the queue directly, rather than creating a copy of the queue. This can be useful when working with large queues, as creating a copy of the queue can be time-consuming and memory-intensive.