【LeetCode】173. Binary Search Tree Iterator (2 solutions)

【【LeetCode】173. Binary Search Tree Iterator (2 solutions)】的更多相关文章

【LeetCode】173. Binary Search Tree Iterator (2 solutions)

Binary Search Tree Iterator Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Calling next() will return the next smallest number in the BST. Note: next() and hasNext() should run in…

【LeetCode】173. Binary Search Tree Iterator 解题报告（Python）

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录题目描述题目大意解题方法保存全部节点只保留左节点日期题目地址:https://leetcode.com/problems/binary-search-tree-iterator/description/ 题目描述 Implement an iterator over a binary search tree (BST). Your iterator will be i…

【LeetCode】二叉查找树 binary search tree（共14题）

链接:https://leetcode.com/tag/binary-search-tree/ [220]Contains Duplicate III (2019年4月20日) (好题) Given an array of integers, find out whether there are two distinct indices i and j in the array such that the absolute difference between nums[i] and nums[…

【原创】leetCodeOj --- Binary Search Tree Iterator 解题报告

时间挤挤总是有的太久不做题,脑子都生锈了.来道水题练练手题目地址: https://leetcode.com/problems/binary-search-tree-iterator/ 题目内容: Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Calling next() will return the…

【LeetCode】Validate Binary Search Tree ——合法二叉树

[题目] 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…

【leetcode】Validate Binary Search Tree

Validate Binary Search Tree 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 c…

【leetcode】Recover Binary Search Tree

Recover Binary Search Tree Two elements of a binary search tree (BST) are swapped by mistake. Recover the tree without changing its structure. Note:A solution using O(n) space is pretty straight forward. Could you devise a constant space solution? 中序…

【leetcode】Validate Binary Search Tree（middle）

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…

【题解】【BST】【Leetcode】Validate Binary Search Tree

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…

【leetcode】 Validate Binary Search Tree

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…

【LeetCode】Validate Binary Search Tree 二叉查找树的推断

题目: Given a binary tree, determine if it is a valid binary search tree (BST). 知识点:BST的特点: 1.一个节点的左子树的全部点都小于或等于这个点的值.右子树的全部节点的值大于该节点的值: 2.最左节点值最小,最右节点值最大. 3.中序遍历结果值是一个非降的数列问题:假设用Integer.MAX_VALUE会过不了測试用例,但是依照TreeNode中的定义.val值也是int呀.没办法用了Long.假设谁知道,麻烦…

【leetcode】1038. Binary Search Tree to Greater Sum Tree

题目如下: Given the root of a binary search tree with distinct values, modify it so that every node has a new value equal to the sum of the values of the original tree that are greater than or equal to node.val. As a reminder, a binary search tree is a t…

二叉树前序、中序、后序非递归遍历 144. Binary Tree Preorder Traversal 、 94. Binary Tree Inorder Traversal 、145. Binary Tree Postorder Traversal 、173. Binary Search Tree Iterator

144. Binary Tree Preorder Traversal 前序的非递归遍历:用堆来实现如果把这个代码改成先向堆存储左节点再存储右节点,就变成了每一行从右向左打印如果用队列替代堆,并且先存储左节点,再存储右节点,就变成了逐行打印 class Solution { public: vector<int> preorderTraversal(TreeNode* root) { vector<int> result; if(root == NULL) return res…

leetcode@ [173] Binary Search Tree Iterator (InOrder traversal)

https://leetcode.com/problems/binary-search-tree-iterator/ Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Calling next() will return the next smallest number in the BST. Note: nex…