程序设计中有关数据结构与算法的关键问题，两页A4大小适合复习-Programming, data structures and algorithms related to the key issues for review two pages A4 size

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.

对一个数组进行摇摆排序使a1<a2>a3<a4>a5-sort the array in wiggle way