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Commit 7cb26d2

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‎Linklist/linklist.md

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​ 循环链表是一种特殊的单链表,与单链表不同的是尾节点不指向空地址,指向链表的头结点。优点是从链尾到链头比较方便,当要处理的数据具有环形结构特点是,非常适合用循环链表来处理。
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![image](https://github.com/huxiaoman7/leetcodebook/tree/master/Linklist/pic/2.png)
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![image](https://raw.githubusercontent.com/huxiaoman7/leetcodebook/master/Linklist/pic/2.png)
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#### 双向链表
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​ 双向链表支持两个方向,每个节点不只有一个后驱指针next指向后面的节点,还有一个前驱指针prev指向前面的节点。
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![image](https://github.com/huxiaoman7/leetcodebook/tree/master/Linklist/pic/3.png)
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![image](https://raw.githubusercontent.com/huxiaoman7/leetcodebook/master/Linklist/pic/3.png)
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#### 双向循环链表
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![image](https://github.com/huxiaoman7/leetcodebook/tree/master/Linklist/pic/4.png)
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![image](https://raw.githubusercontent.com/huxiaoman7/leetcodebook/master/Linklist/pic/4.png)
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### 与数组的性能对比
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- 解题思路:迭代法。翻转链表第一步找起始位置和它前面的节点,头结点的前驱节点我们还是设置dummy,从m->n翻转,那么在开始处设置为start node,后驱节点设置为then, 即start.next = then,来帮助我们翻转。以test case 为例,下面是第一次翻转:
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![image](https://github.com/huxiaoman7/leetcodebook/tree/master/Linklist/pic/5.png)
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​ 第一次翻转完成之后,如图所示 由 dummy->1 - 2 - 3 - 4 - 5 变成了 dummy->1 - 3 - 2 - 4 - 5,同理,迭代,第二次翻转后 由 dummy->1 - 3 - 2 - 4 - 5 变成 dummy->1 - 4 - 3 - 2 - 5,翻转结束。简单来说,相当于不断地交换then和start,然后将then后移直到结束。
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