队列（Queue）是一种用于实现先进先出（FIFO）的数据结构，即第一个进入队列的数据排在队列的最前处，第二个进入队列的数据排在其后，依此类推；出队列时，总是排在队列最前处的那个数据先出队列。-Queue is used to implement FIFO (FIFO) data structure, that is, the first row of data into the queue in the queue at the most before the second row of data into the queue in the following, and so on　When out of the queue is always in the queue at the front of that data, first-out queue.