说明：  从文件读入30个无序整数，建立一个双向循环链表并输出，调整链表顺序为 （a1,a3.a5…,a2,a4,a6…）并输出。
(Read from the document 30 disorderly integer, a bidirectional circular list and output adjustment linked list of the order of (a1, a3.a5 ..., a2, a4, a6 ...) and outputs.)