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Update 0235.二叉搜索树的最近公共祖先.md

补充B站视频链接

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`35`	`35`	`* 所有节点的值都是唯一的。`
`36`	`36`	`* p、q 为不同节点且均存在于给定的二叉搜索树中。`
`37`	`37`
`38`		`-# 思路`
	`38`	`+# 算法公开课`
	`39`	`+`
	`40`	`+《代码随想录》算法视频公开课:[二叉搜索树找祖先就有点不一样了!\| 235. 二叉搜索树的最近公共祖先](https://www.bilibili.com/video/BV1Zt4y1F7ww?share_source=copy_web),相信结合视频在看本篇题解,更有助于大家对本题的理解。`
`39`	`41`
	`42`	`+# 思路`
`40`	`43`
`41`	`44`	`做过[二叉树:公共祖先问题](https://programmercarl.com/0236.二叉树的最近公共祖先.html)题目的同学应该知道,利用回溯从底向上搜索,遇到一个节点的左子树里有p,右子树里有q,那么当前节点就是最近公共祖先。`
`42`	`45`

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