广度优先搜索(BFS)🌐 简单难度 Maximum Depth of Binary Tree:二叉树的最大深度。 Minimum Depth of Binary Tree:二叉树的最小深度。 Maximum Depth of N-ary Tree:N叉树的最大深度。 中等难度 Binary Tree Level Order Traversal:二叉树的层序遍历。 Binary Tree Zigzag Level Order Traversal:二叉树的Z字形...
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 / \ 9 20 / \ 15 7 return its level order traversal as: [ [3], [9,20], [15,7] ] 广度优先搜索...
Queue<TreeNode> queue =newArrayDeque<>(); queue.add(root);while(!queue.isEmpty()) {intn = queue.size();for(inti =0; i < n; i++) {// 变量 i 无实际意义,只是为了循环 n 次TreeNode node = queue.poll();if(node.left != null) { queue.add(node.left); }if(node.right != nu...
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 3/\920/\157 return its level order traversal as: 代码...
力扣107. 二叉树的层次遍历 II(层序遍历,队列,广度优先算法,BFS) https://leetcode-cn.com/problems/binary-tree-level-order-traversal-ii/ 给定一个二叉树,返回其节点值自底向上的层次遍历。 (即按从叶子节点所在层到根节点所在的层,逐层从左向右遍历) 例如: 给定二叉树 [3,9,20,null,null,15,7], ....
[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...
LeetCode 102. Binary Tree Level Order Traversal 二叉树的层序遍历(Medium) 本题要求二叉树的层次遍历,所以同一层的节点应该放在一起,故使用模板二。 # Definition for a binary tree node. # class TreeNode: # def __init__(self, val=0, left=None, right=None): ...
Problem Description: Given a binary tree, return its node values in level order traversal. That is, nodes at each level are visited from left to right, level by level. Applying BFS: Our starting node is the root of the binary tree. We don't have a specific ending node; we'll cont...
for节点 in cur的所有相邻节点: if该节点有效且未被访问过: queue.push(该节点) } level ++; } 上面两个是通用模板,在任何题目中都可以用,是要记住的! 应用一:层序遍历 LeetCode 102. Binary Tree Level Order Traversal 二叉树的层序遍历(Medium) ...
// C++ program to print inorder traversal // using stack. #include<bits/stdc++.h> using namespace std; /* A binary tree Node has data, pointer to left child and a pointer to right child */ struct Node { int data; struct Node* left; struct Node* right; Node (int data) { this...