Leetcode 102 Binary Tree Level Order Traversal Leetcode 103 Binary Tree Zigzag Level Order Traversal Leetcode 297 Serialize and Deserialize Binary Tree (二叉树序列化) Leetcode 314 Binary Tree Vertical Order Traversal💌②基于图的BFS(联通问题、通常需要一个set来记录访问过的节点) Q:图上的宽度优先搜...
* TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */classSolution{public:vector<vector<int>> levelOrder(TreeNode* root) {if(root==nullptr)return{};queue<TreeNode*> q; q.push(root);vector<vector<int>> ans;intcurLayerNodeNums =1;intnextLayerNodeNums =0;vector<int>...
1、树的蛇形走位(遍历):Binary Tree Zigzag Level Order Traversal - LeetCode Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and alternate between). For example:Given binary tree [3,9,20,...
Queue<TreeNode> queue =newLinkedList<TreeNode>(); queue.add( root );while( !queue.isEmpty() ) { Queue<TreeNode> tempQ =newLinkedList<TreeNode>(); temp=newArrayList<Integer>();while( !queue.isEmpty() ) { TreeNode tn=queue.poll();if( tn.left !=null) { tempQ.add( tn.left );...
[leetcode] Binary Tree Zigzag Level Order Traversal | zigzag形状traverse树 Posted by: lexigrey on: October 19, 2013 In: leetcode Leave a Comment 树的dfs变形,还是两个list来回倒。但是这题上来就写还不行,真心得在纸上画一画才能看出来规律。一开始觉得keep一个boolean,正常顺序就加后面,逆序就...
深度优先遍历(Depth First Search, 简称 DFS) 与广度优先遍历(Breath First Search)是图论中两种非常重要的算法,生产上广泛用于拓扑排序,寻路(走迷宫),搜索引擎,爬虫等,也频繁出现在 leetcode,高频面试题中。 本文将会从以下几个方面来讲述深度优先遍历,广度优先遍历,相信大家看了肯定会有收获。
3.Maximum Depth of Binary Tree - 求二叉树的深度 DFS 4.Balanced Binary Tree - 判断平衡二叉树 DFS 5.Path Sum - 二叉树路径求和判断DFS 题目概述: Given a binary tree, return thelevel ordertraversal of its nodes' values. (ie, from left to right, level by level). ...
深度优先遍历(Depth First Search, 简称 DFS) 与广度优先遍历(Breath First Search)是图论中两种非常重要的算法,生产上广泛用于拓扑排序,寻路(走迷宫),搜索引擎,爬虫等,也频繁出现在 leetcode,高频面试题中。 前言 深度优先遍历(Depth First Search, 简称 DFS) 与广度优先遍历(Breath First Search)是图论中两种非常...
Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). For example: Given binary tree [3,9,20,null,null,15,7], 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
我在google interview中就遇到了一道题目类似Leetcode 317 Shortest Distance from All Buildings。LC 317依然是付费题,不放链接了,题目长这样: You want to build a house on an empty land which reaches all buildings in the shortest amount of distance. You can only move up, down, left and right. ...