使用递归,根据树深度判断节点值应该添加入集合的哪个位置。 publicList<List<Integer>>levelOrder(TreeNode root){ List<List<Integer>> res =newArrayList<>();if(root ==null)returnres; travel(root,res,0);returnres; }privatevoidtravel(TreeNode root,List<List<Integer>> res,intdepth){if(root ==null...
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 ...
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. 2. 3. 4. 5. return its bottom-up level orde...
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,null,null,15,7], 3 / \ 9 20 / \ 15 7 return ...
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
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...
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 / 15 7 return its level order traversal as: ...
102. 二叉树的层序遍历 - 给你二叉树的根节点 root ,返回其节点值的 层序遍历 。 (即逐层地,从左到右访问所有节点)。 示例 1: [https://assets.leetcode.com/uploads/2021/02/19/tree1.jpg] 输入:root = [3,9,20,null,null,15,7] 输出:[[3],[9,20],[15,7]]
LeetCode 每日一题 Daily Challenge 107 Binary Tree Level Order Traversal II 369 -- 4:05 App LeetCode 每日一题 Daily Challenge 239 Sliding Window Maximum 113 1 2:43 App LeetCode 每日一题 Daily Challenge 538 Convert BST to Greater Tree 237 -- 5:28 App LeetCode 每日一题 Daily Challenge 79...
Binary Tree Traversal Binary Tree Reconstruction(leetcode可用) Polish Notation/Reverse Polish Notation N-ary Tree 什么是树(Tree),树的概念是什么 https://www.geeksforgeeks.org/binary-tree-set-1-introduction/www.geeksforgeeks.org/binary-tree-set-1-introduction/ ...