double linked list双向链表
[tags] C++双向链表的实现与单向链表相近节点结构体类声明总结双向链表的实现（与单向链表相近）1. 节点结构体struct DouListNode { int elem; DouListNode *prev, *next; DouListNode(int e = 0, DouListNode *p = 0, DouListNode *n = 0) { elem = e
