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`@@ -135,7 +135,6 @@`
`135`	`135`	`*[回溯算法：组合问题再剪剪枝](https://mp.weixin.qq.com/s/Ri7spcJMUmph4c6XjPWXQA)`
`136`	`136`	`*[回溯算法：求组合总和！](https://mp.weixin.qq.com/s/HX7WW6ixbFZJASkRnCTC3w)`
`137`	`137`	`*[回溯算法：电话号码的字母组合](https://mp.weixin.qq.com/s/e2ua2cmkE_vpYjM3j6HY0A)`
`138`		`-*[]()`
`139`	`138`
`140`	`139`	`（持续更新中....）`
`141`	`140`

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`@@ -1,7 +1,8 @@`
	`1`	`+>找到有没有环已经很不容易了，还要让我找到环的入口?`
	`2`	`+`
`1`	`3`	`#题目地址`
`2`	`4`	`https://leetcode-cn.com/problems/linked-list-cycle-ii/`
`3`	`5`
`4`		`->找到有没有环已经很不容易了，还要让我找到环的入口?`
`5`	`6`
`6`	`7`	`#第142题.环形链表II`
`7`	`8`
`@@ -46,7 +47,7 @@ fast和slow各自再走一步， fast和slow就相遇了`
`46`	`47`	`动画如下：`
`47`	`48`
`48`	`49`
`49`		`-<videosrc='../video/142.环形链表II1.mp4'controls='controls'width='640'height='320'autoplay='autoplay'> Your browser does not support the video tag.</video></div>`
	`50`	`+<imgsrc='../video/141.环形链表.gif'width=600> </img></div>`
`50`	`51`
`51`	`52`
`52`	`53`	`##如果有环，如何找到这个环的入口`
@@ -90,7 +91,7 @@ fast指针走过的节点数：` x + y + n (y + z)`，n为fast指针在环内走
`90`	`91`
`91`	`92`	`动画如下：`
`92`	`93`
`93`		`-<videosrc='../video/142.环形链表II.mp4'controls='controls'width='640'height='320'autoplay='autoplay'> Your browser does not support the video tag.</video></div>`
	`94`	`+<imgsrc='../video/142.环形链表II（求入口）.gif'width=600> </img></div>`
`94`	`95`
`95`	`96`
`96`	`97`	`那么 n如果大于1是什么情况呢，就是fast指针在环形转n圈之后才遇到 slow指针。`

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