link:[https://leetcode.com/explore/learn/card/data-structure-tree/134/traverse-a-tree/928/] 递归解法: #Definition for a binary tree node.#class TreeNode(object):#def __init__(self, x):#self.val = x#self.left = None#self.right = NoneclassSolution(object):defsolve(self,root):ifroo...
代码如下: 1/**2* Definition for binary tree3* struct TreeNode {4* int val;5* TreeNode *left;6* TreeNode *right;7* TreeNode(int x) : val(x), left(NULL), right(NULL) {}8* };9*/10classSolution {11public:12vector<int> postorderTraversal(TreeNode *root) {13vector<int>nodeValu...
Leetcode 144 binary tree preorder traversal 下面这种写法使用了一个辅助结点p,这种写法其实可以看作是一个模版,对应的还有中序和后序的模版写法,形式很统一,方便于记忆。 辅助结点p初始化为根结点,while循环的条件是栈不为空或者辅助结点p不为空,在循环中首先判断如果辅助结点p存在,那么先将p加入栈中,然后将...
/** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode() {} * TreeNode(int val) { this.val = val; } * TreeNode(int val, TreeNode left, TreeNode right) { * this.val = val; * this.left = left; *...
For example: Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,2,3]. 栈迭代 复杂度 时间O(b^(h+1)-1) 空间 O(h) 递归栈空间 对于二叉树b=2 思路 用迭代法做深度优先搜索的技巧就是使用一个显式声明的Stack存储遍历到节点,替代递归中的进程栈,实际上空间复杂度还是一样的。对于先序遍历...
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 ...
* Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */privateintdepth(TreeNode root){if(root==null)return0;returnMath.max(depth(root.left),depth(root.right))+1;} ...
LeetCode Binary Tree Paths(简单题) 题意: 给出一个二叉树,输出根到所有叶子节点的路径。 思路: 直接DFS一次,只需要判断是否到达了叶子,是就收集答案。 1 /** 2 * Definition for a binary tree node. 3 * struct TreeNode { 4 * int val;
commonly referenced assembly; therefore, it is desirable that in the version of the .NET Framework the functionalities in the standard mscorlib assembly are split into two parts—core stuff and desktop stuff—in order to lay the groundwork for binary compatibility between Silverlight and .NET ...
commonly referenced assembly; therefore, it is desirable that in the version of the .NET Framework the functionalities in the standard mscorlib assembly are split into two parts—core stuff and desktop stuff—in order to lay the groundwork for binary compatibility between Silverlight and ...