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Merge pull request youngyangyang04#860 from sugarlesss/master

更新 0019.删除链表的倒数第N个节点错别字勘误

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Original file line number	Diff line number	Diff line change
`@@ -50,7 +50,7 @@`
`50`	`50`	`* fast首先走n + 1步 ,为什么是n+1呢,因为只有这样同时移动的时候slow才能指向删除节点的上一个节点(方便做删除操作),如图:`
`51`	`51`	`<img src='https://code-thinking.cdn.bcebos.com/pics/19.%E5%88%A0%E9%99%A4%E9%93%BE%E8%A1%A8%E7%9A%84%E5%80%92%E6%95%B0%E7%AC%ACN%E4%B8%AA%E8%8A%82%E7%82%B91.png' width=600> </img></div>`
`52`	`52`
`53`		`-* fast和slow同时移动,之道fast指向末尾,如题:`
	`53`	`+* fast和slow同时移动,直到fast指向末尾,如题:`
`54`	`54`	`<img src='https://code-thinking.cdn.bcebos.com/pics/19.%E5%88%A0%E9%99%A4%E9%93%BE%E8%A1%A8%E7%9A%84%E5%80%92%E6%95%B0%E7%AC%ACN%E4%B8%AA%E8%8A%82%E7%82%B92.png' width=600> </img></div>`
`55`	`55`
`56`	`56`	`* 删除slow指向的下一个节点,如图:`

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