LCA(Least Common Ancestors),即最近公共祖先,是指在有根树中,找出某两个结点u和v最近的公共祖先。 题目描述 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 的两个结点 p、q,最近公共祖先表示为一个结点 x,满足 x 是 p、q 的祖先且 x 的深度...
(Skip)二叉树中两节点的最小公共祖先 LeastCommonAncestor LCA 二叉树节点间的最短路径 递归打印文件和目录 排序 快速排序(拆分为qui ckSor t和parti ti on的版本) 快速排序非递归实现 数组中出现次数超过一半的数字/中位数 ( 类似于快速排序) 无序数组Top K 无序数组中的第k大元素(基于partition) 数据流中...
235 Lowest Common Ancestor of a Binary Search Tree // #235二叉搜索树最近公共祖先 描述:如题。 //#235Description: Lowest Common Ancestor of a Binary Search Tree | LeetCode OJ 解法1:二分。 // Solution 1: Binary search. 代码1 //Code 1 236 Lowest Common Ancestor of a Binary Tree // #2...
【题目】Additive number is a string whose digits can form additive sequence. A valid additive sequence should contain at least three numbers. Except for the first two numbers, each subsequent number in the sequence must be the sum of the preceding two. For example: "112358" is an add...
(Skip)二叉树中两节点的最小公共祖先 LeastCommonAncestor LCA 二叉树节点间的最短路径 递归打印文件和目录 排序 快速排序(拆分为qui ckSor t和parti ti on的版本) 快速排序非递归实现 数组中出现次数超过一半的数字/中位数 ( 类似于快速排序) 无序数组Top K ...
解释:节点 5 和节点 1 的最近公共祖先是节点 3 。 来源:力扣(LeetCode) 链接:https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; ...
we strongly advise you to go through this list at least a second time, or even better - a third time. By the second attempt, you may discover some new tricks or new methods. By the third time, you should find that your code appear to be more concise compared to your first attempt....
747 Largest Number At Least Twice of Others 42.60% Easy 746 Min Cost Climbing Stairs 43.60% Easy 745 Prefix and Suffix Search 24.50% Hard 744 Find Smallest Letter Greater Than Target 45.30% Easy 743 Network Delay Time 34.30% Medium 742 Closest Leaf in a Binary Tree $ 33.20% Medium 741 ...
请你设计并实现 getKthAncestor(int node, int k) 函数,函数返回节点 node 的第 k 个祖先节点。如果不存在这样的祖先节点,返回 -1 。 树节点的第 k 个祖先节点是从该节点到根节点路径上的第 k 个节点。 示例: 输入: ["TreeAncestor","getKthAncestor","getKthAncestor","getKthAncestor"] [[7,[-1,...
862.Shortest-Subarray-with-Sum-at-Least-K (H) 1425.Constrained-Subsequence-Sum (H) 1438.Longest-Continuous-Subarray-With-Absolute-Diff-Less-Than-or-Equal-to-Limit (H) 1499.Max-Value-of-Equation (M+) 1562.Find-Latest-Group-of-Size-M (H) 1696.Jump-Game-VI (M+) 1776.Car-Fleet-II (...