Binary Tree Zigzag Level Order Traversal二叉树的锯齿形层次遍历 给定一个二叉树,返回其节点值的锯齿形层次遍历。(即先从左往右,再从右往左进行下一层遍历,以此类推,层与层之间交替进行)。 例如: 给定二叉树 [3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 7 返回锯齿形层次遍历如下: [ [3],...
LeetCode 0102. Binary Tree Level Order Traversal二叉树的层次遍历【Medium】【Python】【BFS】 Problem LeetCode Given a binary tree, return thelevel ordertraversal of its nodes' values. (ie, from left to right, level by level). For example: Given binary tree[3,9,20,null,null,15,7], 3 ...
代码: #Definition for a binary tree node#class TreeNode:#def __init__(self, x):#self.val = x#self.left = None#self.right = NoneclassSolution:#@param root, a tree node#@return a list of lists of integersdefpreorder(self, root, level, res):ifroot:iflen(res) < level+1: res....
Python 代码 fromcollectionsimportdeque# 定义二叉树节点classTreeNode:def__init__(self,val=0,left=None,right=None):self.val=valself.left=leftself.right=rightdeflevelOrder(root):# 如果根节点为空,返回空列表ifnotroot:return[]# 初始化队列和结果列表queue=deque([root])result=[]whilequeue:level_siz...
[Leetcode][python]Binary Tree Zigzag Level Order Traversal,题目大意按之字形遍历二叉树(一正一反)解题思路来自:链接解题思路:这道题和上一题层序遍历那道题差不多,区别只是在于奇数层的节点要翻转过来存入数组。代码:代码BFSclassSolution(object):defzigzagLeve
102.binary-tree-level-order-traversal 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], 3 / \ 9 20...
Write a routine to list out the nodes of a binary tree in “level-order”. List the root, then nodes at depth 1, followed by nodes at depth 2, and so on. You must do this in linear time. Format of functions: void Level_order ( Tree T, void (*visit)(Tree ThisNode) ); 1 ...
In this article, we are going to learn Level order traversal on a binary tree: Inorder, Preorder and Postorder Traversal. Submitted by Radib Kar, on September 29, 2018 For traversal on any binary tree, we mainly use three types of traversal. Those are:Inorder traversal Preorder ...
https://leetcode.com/problems/binary-tree-level-order-traversal/ 题意分析: 宽度优先搜索一颗二叉树,其中同一层的放到同一个list里面。比如: 3 / \ 9 20 / \ 15 7 返回 [ [3], [9,20], [15,7] ] 题目思路: 新定义一个函数,加多一个层数参数,如果目前答案的列表答案个数等于层数,那么当前层数...
链接:https://leetcode-cn.com/problems/binary-tree-level-order-traversal python # 0102.二叉树的层序遍历 classSolution: deflevelOrder(self,root:TreeNode)-> [[int]]: """ 迭代法:双端队列,每次把单层的节点遍历出队列,另外将对应的左右节点加入队列 ...