http://baijiahao.baidu.com/s?id=1603257419363936237&wfr=spider&for=pc

双向链表与单向链表的区别
https://zhidao.baidu.com/question/225218516.html

1、单链表的增删改查
2、双向链表的增删改查
https://www.cnblogs.com/corvoh/p/5595130.html
https://www.cnblogs.com/littlehb/p/10995786.html


链表的用途
https://www.zhihu.com/question/60724366