二叉树变量只是一个地址 public static void main(String[] args) { TreeNode t = new TreeNode(3); help(t); System.out.println(t.val); } public static void help(TreeNode t) { t.val = 6; } 上边代码通过地址改变了二叉树,输出为6,但是下边代码却只是传入函数的二叉树变量指向了另一个地址,外界的二叉树变量和二叉树的值没有变,输出还是3 public…

Given a root node reference of a BST and a key, delete the node with the given key in the BST. Return the root node reference (possibly updated) of the BST. Basically, the deletion can be divided into two stages: Search for a node to remove. If the n…

Given a root node reference of a BST and a key, delete the node with the given key in the BST. Return the root node reference (possibly updated) of the BST. Basically, the deletion can be divided into two stages: Search for a node to remove. If the n…

删除二叉搜索树的节点 给定一个二叉搜索树的根节点 root 和一个值 key,删除二叉搜索树中的 key 对应的节点,并保证二叉搜索树的性质不变.返回二叉搜索树(有可能被更新)的根节点的引用. 一般来说,删除节点可分为两个步骤: 首先找到需要删除的节点: 如果找到了,删除它. 说明: 要求算法时间复杂度为 O(h),h 为树的高度. 示例: root = [5,3,6,2,4,null,7] key = 3 给定需要删除的节点值是 3,所以我们首先找到 3 这个节点,然后删除它. 一个正确的答案…

LeetCode初级算法--树02:验证二叉搜索树 搜索微信公众号:'AI-ming3526'或者'计算机视觉这件小事' 获取更多算法.机器学习干货 csdn:https://blog.csdn.net/baidu_31657889/ csdn:https://blog.csdn.net/abcgkj/ github:https://github.com/aimi-cn/AILearners 一.引子 这是由LeetCode官方推出的的经典面试题目清单~ 这个模块对应的是探索的初级算法~旨在帮助…

数据结构中常见的树(BST二叉搜索树.AVL平衡二叉树.RBT红黑树.B-树.B+树.B*树) 二叉排序树.平衡树.红黑树 红黑树----第四篇:一步一图一代码,一定要让你真正彻底明白红黑树 --- 很好…

二叉搜索树的结构(30 分) PTA 模拟+字符串处理 二叉搜索树的节点插入和非递归遍历   二叉搜索树的结构(30 分) 二叉搜索树或者是一棵空树,或者是具有下列性质的二叉树: 若它的左子树不空,则左子树上所有结点的值均小于它的根结点的值:若它的右子树不空,则右子树上所有结点的值均大于它的根结点的值:它的左.右子树也分别为二叉搜索树.(摘自百度百科) 给定一系列互不相等的整数,将它们顺次插入一棵初始为空的二叉搜索树,然后对结果树的结构进行描述.你需要能判断给定的描述是否正确.例如将{ 2 4…

Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may assume k is always valid, 1 ≤ k ≤ BST's total elements. Follow up: What if the BST is modified (insert/delete operations) often and you nee…

Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later in the same or another comput…

Given a binary search tree with non-negative values, find the minimum absolute difference between values of any two nodes. Example: Input: 1 \ 3 / 2 Output: 1 Explanation: The minimum absolute difference is 1, which is the difference between 2 and 1…