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,#,#,15,7}, 3 / \ 9 20 / \ 15 7 return its level order traversal as: [ [3], [9,20], [15,7] ] con…
1.二叉树的三种遍历方式 二叉树有三种遍历方式:先序遍历,中序遍历,后续遍历 即:先中后指的是访问根节点的顺序 eg:先序 根左右 中序 左根右 后序 左右根 遍历总体思路:将树分成最小的子树,然后按照顺序输出 1.1 先序遍历 a 先访问根节点 b 访问左节点 c 访问右节点 a(b ( d ( h ) )( e ( i ) ))( c ( f )( g )) -- abdheicfg 1.2 中序遍历 a 先访问左节点 b 访问根节点 c 访问右节点 ( (…
二叉树的遍历分为前序.中序.后序和层序遍历四种方式 首先先定义一个二叉树的节点 //二叉树节点 public class BinaryTreeNode { private int data; private BinaryTreeNode left; private BinaryTreeNode right; public BinaryTreeNode() {} public BinaryTreeNode(int data, BinaryTreeNode left, BinaryTreeNode…
[107-Binary Tree Level Order Traversal II(二叉树层序遍历II)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root). For example…
Given a binary tree, return the bottom-up level order traversal 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 return its bottom-up level or…
