Binary Tree Level Order Traversal 2 二叉树层序遍历 给一个二叉树的root,返回其节点值从低向上遍历,每一层从左到右 遍历。 Input: root = [3,9,20,null,null,15,7] Output: [[15,7],[9,20],[3]] /** * Definition for a binary tree node. * public clas
https://oj.leetcode.com/problems/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,#,#,15,7}, 3 / \ 9 20...
5. Construct Binary Tree from Preorder and Inorder Traversal 与上题类似,我们知道preorder第一个元素一定是根节点,按照这个特性可以找出根节点在inorder中的位置,从该位置分开,左右两边分别就是左右子树。 class Solution: def buildTree(self, preorder: List[int], inorder: List[int]) -> TreeNode: if...
Binary Tree Inorder Traversal Given a binary tree, return the inorder traversal of its nodes' values. For example: Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,3,2]. 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 用栈中序遍历没有先序遍历...
2. Make information easy to search (see tree traversal).搜索 3. Manipulate sorted lists of data. 4. As a workflow for compositing digital images for visual effects. 5. Router algorithms 6. Form of a multi-stage decision-making (see business chess). ...
二叉树(Binary Tree)是一种树形数据结构 publicclassTreeNode{intval;TreeNodeleft;TreeNoderight;TreeNode(intval=val; 基本概念 "二叉树"(Binary Tree)这个名称的由来是因为二叉树的每个节点最多有两个子节点,一个左子节点和一个右子节点。其中,“二叉”指的是两个,因此“二叉树”表示每个节点最多可以分支成两...
push(root); 28 tree_queue.push(NULL); 29 int nLevelCount = 1; 30 while (true) { 31 TreeNode *pTemp = tree_queue.front(); 32 tree_queue.pop(); 33 if (pTemp == NULL) { 34 if (nLevelCount%2 == 0) { //if the num of level is odd, swap the ivec; 35 Swap(ivec); ...
Binary Tree Postorder Traversal Given a binary tree, return the postorder For example: Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [3,2,1]. Note: /** * Definition for a binary tree node.
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Binary tree (a) has 8 nodes, with node 1 as its root. Node 1's left child is node 2; node 1's right child is node 3. Notice that a node doesn't need to have both a left child and right child. In binary tree (a), node 4, for example, has only a right child. Further...