(deque, full name double-ended queue) is a data structure with the properties of queue and stack. Elements in a two-way queue can be popped from both ends, and insertion and deletion operations are limited to both ends of the table. In actual use, there can also be output-restricted two-way queues (that is, one endpoint allows insertion and deletion, and the other endpoint only allows insertion) and input-restricted two-way queues (that is, one endpoint allows insertion and deletion, and the other endpoint allows insertion and deletion, and the other endpoint only allows insertion). One endpoint only allows deletion of dequeues). And if the element inserted from a certain endpoint of the bidirectional queue is restricted to only be deleted from that endpoint, then the bidirectional queue will transform into two adjacent stacks at the bottom. DEQue.class.php
## Introduction: In actual use, there can also be output-limited bidirectional queues (i.e., one endpoint allows insertion and deletion, and the other endpoint only allows insertions) and input-limited bidirectional queues (i.e., one endpoint allows insertion and deletion) , the other endpoint only allows deletion of dequeues). And if the element inserted from a certain endpoint of the bidirectional queue is restricted to only be deleted from that endpoint, then the bidirectional queue will transform into two adjacent stacks at the bottom.
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