3. Binary Tree Zigzag Level Order Traversal Given a binary tree, return thezigzag level ordertraversal 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 ...
返回一棵 BST的两个结点的最小绝对值的距离之差。 Given a binary search tree with non-negative values, find the minimumabsolute differencebetween values of any two nodes. 题解:根据 BST 的性质,我们只需要用一个变量记录中序遍历的前一个结点prev即可。 View Code 【683】K Empty Slots 【699】Falling...
* type TreeNode struct { * Val int * Left *TreeNode * Right *TreeNode * } */ type BSTIterator struct { // 结点栈(所有结点的左子结点都已经入栈过) stack []*TreeNode } func Constructor(root *TreeNode) BSTIterator { // 初始化一个空栈的迭代器 bstIterator := BSTIterator{} // 将...
Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node's key. The right subtree of a node contains only nodes with keys greater than the node's key....
return dfs(root.Left, low, &root.Val) && dfs(root.Right, &root.Val, high) } 题目链接: Validate Binary Search Tree: leetcode.com/problems/v 带因子的二叉树: leetcode.cn/problems/va LeetCode 日更第 209 天,感谢阅读至此的你 欢迎点赞、收藏鼓励支持小满 ...
题目:Vaildata Binary Search Tree(验证二叉搜索树) Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only nodes with keysless thanthe node's key. ...
LeetCode 96:Unique Binary Search Trees Givenn, how many structurally uniqueBST's(binary search trees) that store values 1...n? For example, Givenn= 3, there are a total of 5 unique BST's. 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3 2...
http://www.programcreek.com/2014/04/leetcode-binary-search-tree-iterator-java/ Anyway, Good luck, Richardo! My code: /** * Definition for binary tree * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } ...
108. 将有序数组转换为二叉搜索树 - 给你一个整数数组 nums ,其中元素已经按 升序 排列,请你将其转换为一棵 平衡 二叉搜索树。 示例 1: [https://assets.leetcode.com/uploads/2021/02/18/btree1.jpg] 输入:nums = [-10,-3,0,5,9] 输出:[0,-3,9,-10,null,5] 解
Image credit: https://leetcode.com/articles/binary-search-tree-iterator/ In order traversal using stack In order to reduce memory from O(N) to O(lgN), aka O(h) where h is the height of the tree, an alternative is return the next inline while we are performing the recursion. The tri...