Total Accepted: 97599 Total Submissions: 257736 Difficulty: Medium Given a binary tree, return the preorder traversal of its nodes' values. For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,2,3]. Note: Recursive solution is trivial, could…

Given a binary tree with N nodes, each node has a different value from {1, ..., N}. A node in this binary tree can be flipped by swapping the left child and the right child of that node. Consider the sequence of N values reported by a preorder traver…

leetcode面试准备:Lowest Common Ancestor of a Binary Search Tree & Binary Tree 1 题目 Binary Search Tree的LCA 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 Wikiped…

LeetCode & tree & binary tree 树 & 二叉树 refs https://leetcode.com/problemset/all/?topicSlugs=tree https://leetcode.com/problems/merge-two-binary-trees/ https://leetcode.com/problems/maximum-depth-of-binary-tree/ https://leetcode.com/problemset/t…

Given a binary tree with N nodes, each node has a different value from {1, ..., N}. A node in this binary tree can be flipped by swapping the left child and the right child of that node. Consider the sequence of N values reported by a preorder traver…

原题链接在这里:https://leetcode.com/problems/flip-binary-tree-to-match-preorder-traversal/ 题目: Given a binary tree with N nodes, each node has a different value from {1, ..., N}. A node in this binary tree can be flipped by swapping the left child and the r…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 前序遍历 日期 题目地址:https://leetcode.com/problems/flip-binary-tree-to-match-preorder-traversal/ 题目描述 Given a binary tree with N nodes, each node has a different value from {1, -, N}.…

Total Accepted: 98729 Total Submissions: 261539 Difficulty: Medium Given a binary tree, return the inorder traversal of its nodes' values. For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,3,2]. Note: Recursive solution is trivial, could y…

Binary Tree: 0到2个子节点; Binary Search Tree: 所有左边的子节点 < node自身 < 所有右边的子节点: 1. Full类型: 除最下面一层外, 每一层都有两个子节点: 2. Complete类型: 除最下面一层外为Full类型, 但是最下面一层最所有子节点靠左: 3. Balanced类型: 左右两个子树的长度相差小于等于一: /** * Definition of TreeNode: * public class TreeNode { * public…

Lowest Common Ancestor of a Binary Search Tree 一.题目描写叙述 二.思路及代码 二叉搜索树有个性质:左子树的值都比根节点小,右子树的值比根节点大.那么我们的思路就是递归比較. 假设输入的两个节点的值比当前节点小,说明是在当前根节点的左子树中:反之则在右子树中. 假设当前根节点比一个大.比一个小.那么第一个出现的这种节点就是近期的父亲节点了. /** * Definition for a binary tree node. * public clas…