LintCode 88. Lowest Common Ancestor (Medium) LeetCode 236. Lowest Common Ancestor of a Binary Tree (Medium) 今天写了三种解法, 都比较长. 解法1 前序递归DFS, 计数 这个解法的判断比较啰嗦, 但好处就是, 能够根据当前情况选择是否继续向下遍历, 不做无用的搜索. 越早地找到两个节点, 程序就会越早结束. class Solution { private: TreeNode *lca;…

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 v and w as the lowest node in T that has both v and w…

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

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 v and w as the lowest node in T that has both v and w…

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

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 v and w as the lowest node in T that has both v and w…

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

[题目] 输入二叉树中的两个结点,输出这两个结点在数中最低的共同父结点. 二叉树的结点定义如下:  C++ Code  123456   struct BinaryTreeNode {     int value;     BinaryTreeNode *left;     BinaryTreeNode *right; }; [分析] 求数中两个结点的最低共同结点是面试中经常出现的一个问题.这个问题有几个变种. [变种1] 第一个变种是二叉树是一种特殊的二叉树:查找二叉树.也就是树是排序过的,位…

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

题目如下:https://leetcode.com/problems/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 def…