day3, 2021年 12 月 19 日，周日

题目

在循环双链表的 p 所指的结点之前插入 s 所指结点的操作是__。

1. p->prior = s；s->next = p；p->prior->next = s；s->prior = p->prior
2. p->prior = s；p->prior->next = s；s->next = p；s->prior = p->prior
3. s->next = p；s->prior = p->prior；p->prior = s；p->prior->next = s
4. s->next = p；s->prior = p->prior；p->prior->next = s；p->prior = s

答案

选择 4.