队列是一个先进先出的数据结构，支持业务enque（添加一个项目的结构）和dequeue（删除一个项目从结构）。作为一个FIFO数据结构，项目将在相同的顺序，他们原本排队出列。-A queue is a FIFO data structure that supports the operations enque (to add an item to the structure) and dequeue (to remove an item from the structure). As a FIFO data structure, the items are dequeued in the same order they were originally enqueued.