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Merge branch 'youngyangyang04:master' into master

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Jack_ZhijieFang
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problems/0019.删除链表的倒数第N个节点.md
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## 思路
《代码随想录》算法公开课：[链表遍历学清楚！ | LeetCode：19.删除链表倒数第N个节点](https://www.bilibili.com/video/BV1vW4y1U7Gf)，相信结合视频在看本篇题解，更有助于大家对链表的理解。
双指针的经典应用，如果要删除倒数第n个节点，让fast移动n步，然后让fast和slow同时移动，直到fast指向链表末尾。删掉slow所指向的节点就可以了。
思路是这样的，但要注意一些细节。