[LeetCode] Level Order Traversal 题目说明 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,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its level order traversal as: [ [3]...
max_dep=current_dep ret[current_dep- 1].append(node.val)fornodein(node.left,node.right):ifnode: queue.append((node,current_dep+ 1)) q+= 1p+= 1returnret classSolution(object):deflevelOrder(self, root):""":type root: TreeNode :rtype: List[List[int]]"""ret=[]ifnotroot:returnre...
leetcode 107. Binary Tree Level Order Traversal II Given a binary tree, return thebottom-up level ordertraversal of its nodes' values. (ie, from left to right, level by level from leaf to root). For example: Given binary tree[3,9,20,null,null,15,7], 3 / \ 9 20 / \ 15 7 1...
5. return its bottom-up level order traversal as: [ [15,7], [9,20], [3] ] 1. 2. 3. 4. 5. 分析: 这道题目跟上道题目很相似 Leetcode: Binary Tree Level Order Traversal ,唯一不同的就是返回结果是从子叶节点到根节点,所以我们只需要将结果翻转下就好了! 参考代码: /** * Definition f...
这道题和LeetCode笔记:107. Binary Tree Level Order Traversal II是姊妹题,解题思路都是一样的,只是结果要求的顺序是反的,同样有两种方法,也就是经常说到的DFS深度优先遍历和BFS广度优先遍历。 BFS: 广度优先遍历就是一层层地攻略过去,把每一层的所有节点都记录下来再走向下一层。因为每层会有多个节点,不是简...
return its level order traversal as: [ [3], [9,20], [15,7] ] 【Idea】 这个题也不难, 因为O(n)还蛮能打的, 所以po一下 BFS要更好写一些。 这里每层遍历node时直接用了for,没有用queue,不然还要另起个变量标记 【Solution】 # Definition for a binary tree node.# class TreeNode:# def ...
LeetCode—103. Binary Tree Zigzag Level Order Traversal 题目 https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/description/ 之字形层序遍历二叉树。 思路及解法 因为昨天刚做过层序遍历二叉树的题102. Binary Tree L... 查看原文 ...
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_size=len(queue...
Can you solve this real interview question? Binary Tree Level Order Traversal - Given the root of a binary tree, return the level order traversal of its nodes' values. (i.e., from left to right, level by level). Example 1: [https://assets.leetcode.c
Binary Tree Zigzag Level Order Traversal.md Verified 4300b6d colorbox mentioned this pull request Mar 1, 2025 103. Binary Tree Zigzag Level Order Traversal colorbox/leetcode#41 Open Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment ...