Given a binary search tree (BST) with duplicates, find all the mode(s) (the most frequently occurred element) in the given BST. Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than or equal to the nod…

501. Find Mode in Binary Search Tree Given a binary search tree (BST) with duplicates, find all the mode(s) (the most frequently occurred element) in the given BST. Assume a BST is defined as follows: The left subtree of a node contains only nodes wi…

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 日期 题目地址:https://leetcode.com/problems/find-mode-in-binary-search-tree/#/description 题目描述 Given a binary search tree (BST) with duplicates, find all the mode(s) (the most freque…

Given a binary search tree (BST) with duplicates, find all the mode(s) (the most frequently occurred element) in the given BST. Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than or equal to the nod…

Given a binary search tree (BST) with duplicates, find all the mode(s) (the most frequently occurred element) in the given BST. Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than or equal to the nod…

Given a binary search tree and a new tree node, insert the node into the tree. You should keep the tree still be a valid binary search tree. Notice You can assume there is no duplicate values in this tree + node.   Example Given binary search tree as…

［抄题］: Given a binary search tree (BST) with duplicates, find all the mode(s) (the most frequently occurred element) in the given BST. Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than or equal to t…

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 日期 [LeetCode] https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/ Total Accepted: 67533 Total Submissions: 178900 Difficulty: Easy 题目描述 Given a binary…

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 average O(1) time and uses…

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 average O(1) time and uses…

Given a non-empty binary search tree and a target value, find the value in the BST that is closest to the target. Note: Given target value is a floating point. You are guaranteed to have only one unique value in the BST that is closest to the target.…

class Solution { public: vector<int> modes; int maxCnt = 0; int curCnt = 0; int curNum = 0; vector<int> findMode(TreeNode* root) { if (!root) { return modes; } curNum = root->val; inOrder(root); return modes; } void inOrder(TreeNode* root)…

这次是二叉搜索树的遍历 感觉只要和二叉搜索树的题目,都要用到一个重要性质: 中序遍历二叉搜索树的结果是一个递增序列: 而且要注意,在递归遍历树的时候,有些参数如果是要随递归不断更新(也就是如果递归返回上层,参数也需要最新的),就要用全局变量,而不是传参,其实这就是全局变量的定义. 不过如果是保存每层递归内的信息,就需要传参数. 本题显然是需要全局参数 /** * Definition for a binary tree node. * public class TreeNode { * int…

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 Java解法 Python解法 日期 题目地址:https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/#/description 题目描述 Given an array where elements are sorted in ascending order,…

Description Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. Example Given a binary tree as follow: 1 / \ 2 3 / \ 4 5 The minimum depth is …

Description Invert a binary tree. Example 1 1 / \ / \ 2 3 => 3 2 / \ 4 4    解题:题目要求讲二叉树的左子树和右子树对调一下,用递归来做很简单: /** * Definition of TreeNode: * public class TreeNode { * public int val; * public TreeNode left, right; * public TreeNode(int val) { * this…

Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321 Example 2: Input: -123 Output: -321 Example 3: Input: 120 Output: 21 Note:Assume we are dealing with an environment which could only store integers within…

今天发现LintCode页面刷新不出来了,所以就转战LeetCode.还是像以前一样,做题顺序:难度从低到高,每天至少一题. Given a pattern and a string str, find if str follows the same pattern. Here follow means a full match, such that there is a bijection between a letter in pattern and a non-empty word in …

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. (二)解题 本题大意:给定一个单向链表,构造出平衡二叉搜索树 解题思路:参考[一天一道Leet…

[109-Convert Sorted List to Binary Search Tree(排序链表转换成二叉排序树)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 题目大意 给定一个升序的单链表.将它转换成一颗高度平衡的二叉树 解题思路 解法…

[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…

目录 1.二分法引言 2.二叉搜索树定义 3.二叉搜索树的CRUD 4.二叉搜索树的两种极端情况 5.二叉搜索树总结 前言 在[算法04]树与二叉树中,已经介绍过了关于树的一些基本概念以及二叉树的前中后序遍历,而这篇文章将是在二叉树的基础上来展开讲解的二叉搜索树,也就是说二叉搜索树建立在树的基础之上.至于博主为何要花一整篇文章来讲这个二叉搜索树呢?原因很简单,红-黑树是基于二叉搜索树的,如果对二叉搜索树不了解,那还谈何红-黑树?红-黑树的重要性我想各位没吃过佩奇肉也肯定看过宜春跑....是的,j…

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[…

Two elements of a binary search tree (BST) are swapped by mistake. Recover the tree without changing its structure. 来源:力扣(LeetCode)链接:https://leetcode-cn.com/problems/recover-binary-search-tree著作权归领扣网络所有.商业转载请联系官方授权,非商业转载请注明出处. [题意分析] 对于一个BST应该了解的一个重…

[LeetCode]109. Convert Sorted List to Binary Search Tree 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.me/ 题目地址:https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/description/ 题目描述: Given a s…

[LeetCode]99. Recover Binary Search Tree 解题报告(Python) 标签(空格分隔): LeetCode 题目地址:https://leetcode.com/problems/recover-binary-search-tree/description/ 题目描述: Two elements of a binary search tree (BST) are swapped by mistake. Recover the tree without chan…

Problem Link: https://oj.leetcode.com/problems/recover-binary-search-tree/ We know that the inorder traversal of a binary search tree should be a sorted array. Therefore, we can compare each node with its previous node in the inorder to find the two…

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…

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…

Convert Sorted List to Binary Search Tree Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST.     可以采用类似于Covert Sorted Array to Binary Search Tree的方法,但是寻找中点对于链表来说效率较低 可以采用更高效的递归方式,无需寻找中点 注意引用传…