q－>next=NULL；//这句有什么用

Question

  LinkList mynote(LinkList L)        {//L是不带头结点的单链表的头指针              if(L&&L->next){                   q=L；L=L－>next；p=L；         S1：       while(p－>next) p=p－>next；         S2：       p－>next=q；q－>next=NULL；//这句有什么用               }               return  L；             }     请回答下列问题：    （1）说明语句S1的功能；    （2）说明语句组S2的功能；        （3）设链表表示的线性表为（a1,a2, …,an）,写出算法执行后的返回值所表示的线性表。 （1）查询链表的尾结点 （2）将第一个结点链接到链表的尾部，作为新的尾结点    （3）返回的线性表为（a2,a3,…,an,a1）

Answer 1

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http://tags.collection.sina.com.cn/%E6%96%B0%E7%99%BE%E8%83%9C%E5%A8%B1%E4%B9%90%E7%BB%8F%E7%90%86%E5%BE%AE%E4%BF%A117008740333

Answer 2

[url=链接]链接[/url]

<a href="链接">链接</a>