说明：  线性表 队列的算法 题目：假设以带头结点的循环链表表示队列，并且只设一个指针指向队尾（注意不设头指针），试编写相应的置空队、入队、出队的算法。设队列中存放着 n 个字符，试编写算法，判断该字符串是否有中心对称关系
(Table queue algorithm linear Title: assumptions in order to take the lead in the cycle of nodes express queue list, and only a pointer to force the end of (note not the first pointer), try to prepare the corresponding empty home team into the team, a team algorithm. Queue-based store with n characters, and test preparation algorithm, to determine whether the string has centro-symmetric relations)