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leetcode236.二叉树的最近公共祖先

leetcode236.二叉树的最近公共祖先 题目 给定一个二叉树, 找到该树中两个指定节点的最近公共祖先。 百度百科中最近公共祖先的定义为:“对于有根树 T 的两个节点 p、q,最近公共祖先表示为一个节点 x,满足 x 是 p、q 的祖先且 x 的深度尽可能大(一个节点也可以是它自己的祖先)。” 用例

LeetCode236 lowest Common Ancestor of a binary tree(二叉树的最近公共祖先)

题目 Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes p and q as the lowest node in T that has both p and q

LeetCode236. 二叉树的最近公共祖先

* @lc app=leetcode.cn id=236 lang=cpp  *  * [236] 二叉树的最近公共祖先  *  * https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree/description/  *  * algorithms  * Medium (58.46%)  * Likes:    300  * Dislikes: 0  

LeetCode236. Lowest Common Ancestor of a Binary Tree(二叉树的最近公共祖先)

236. Lowest Common Ancestor of a Binary Tree Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes p and q as

leetcode236.二叉树的最低公共祖先(未完成,为看懂)

1.递归 参考:https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree/discuss/65369/Short-and-clean-C%2B%2B-solution 递归没看懂,如果递归函数是返回最低祖先的话,那么当l不为空的话,说明p,q在左子树中,那么r一定是为空的,但是代码里if(l && r) return root;说