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README.md

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* [回溯算法:组合问题再剪剪枝](https://mp.weixin.qq.com/s/Ri7spcJMUmph4c6XjPWXQA)
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* [回溯算法:求组合总和!](https://mp.weixin.qq.com/s/HX7WW6ixbFZJASkRnCTC3w)
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* [回溯算法:电话号码的字母组合](https://mp.weixin.qq.com/s/e2ua2cmkE_vpYjM3j6HY0A)
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* []()
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(持续更新中....)
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problems/0142.环形链表II.md

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> 找到有没有环已经很不容易了,还要让我找到环的入口?
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# 题目地址
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https://leetcode-cn.com/problems/linked-list-cycle-ii/
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> 找到有没有环已经很不容易了,还要让我找到环的入口?
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# 第142题.环形链表II
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动画如下:
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<video src='../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>
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<img src='../video/141.环形链表.gif' width=600> </img></div>
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## 如果有环,如何找到这个环的入口
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动画如下:
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<video src='../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>
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<img src='../video/142.环形链表II(求入口).gif' width=600> </img></div>
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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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