HashMap VS BST

HashMap usually performs search operations bounded with complexity of O(1)<=T(n)<=O(n). BST performs search operations in O(logN)<=T(n)<=O(N).

HashMap is implemented with array and hash function. HashMap has O(1) lookup time when the hashcode disperse keys appropriately.

For some special cases, lookup time can be much longer if the number of elements stored is sufficiently large.

时间： 2025-01-31 06:46:07

HashMap VS BST的相关文章

微软等数据结构+算法面试100题全部答案集锦

1.把二元查找树转变成排序的双向链表. 题目: 输入一棵二元查找树,将该二元查找树转换成一个排序的双向链表. 要求不能创建任何新的结点,只调整指针的指向. 10 / \ 6 14 / \ / \ 4 8 12 16 转换成双向链表 4=6=8=10=12=14=16. 首先我们定义的二元查找树节点的数据结构如下: struct BSTreeNode { int m_nValue; // value of node BSTreeNode *m_pLeft; // left child

用BST实现HashMap

把核心的逻辑都放在Node里面所以Node的代码是: 1 public class MapNode<K extends Comparable<K>, V> { 2 private K key; 3 private V value; 4 private MapNode<K, V> left; 5 private MapNode<K, V> right; 6 7 public MapNode(K key, V value) { 8 this.key = key

Two Sum IV - Input is a BST

Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the given target. Example 1: Input: 5 / 3 6 / \ 2 4 7 Target = 9 Output: True Example 2: Input: 5 / 3 6 / \ 2 4 7 Targe

501. Find Mode in Binary Search Tree查找BST中的众数

［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

[数据结构]二叉搜索树(BST) VS 平衡二叉排序树(AVL) VS B树(平衡多路搜索树) VS B+树 VS 红黑树(平衡二叉B树)

1 二叉排序树/二叉查找树/Binary Sort Tree 1种对排序和查找都很有用的特殊二叉树叉排序树的弊端的解决方案:平衡二叉树二叉排序树必须满足的3条性质(或是具有如下特征的二叉树) 若它的左子树不为空,则:左子树上所有结点的值< 它根结点的值若它的右子树不为空,则:右子树上所有结点的值 > 它根结点的值它的左子树.右子树也分别为二叉排序树(递归性) (按照如上定义,即: 1 无键值相等的结点 2 中序遍历一颗二叉树时,可得一个结点值递增的有序序列) 2 平衡二叉排序树/Bal

HashMap和Hashtable

HashMap和Hashtable的区别 HashMap和Hashtable都实现了Map接口,但决定用哪一个之前先要弄清楚它们之间的分别.主要的区别有:线程安全性,同步(synchronization),以及速度. HashMap几乎可以等价于Hashtable,除了HashMap是非synchronized的,并可以接受null(HashMap可以接受为null的键值(key)和值(value),而Hashtable则不行). HashMap是非synchronized,而Hashtable

538. Convert BST to Greater Tree 二叉搜索树转换为更大树

Given a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the original BST is changed to the original key plus sum of all keys greater than the original key in BST. Example: Input: The root of a Binary Search Tree like thi

HashMap存储原理

1. HashMap概述 HashMap是基于哈希表的Map接口的非同步实现.此实现提供所有可选的映射操作,并允许使用null值和null键.此类不保证映射的顺序,特别是它不保证该顺序恒久不变. 2. HashMap的数据结构在java编程语言中,最基本的结构就是两种,一个是数组,另外一个是模拟指针(引用),所有的数据结构都可以用这两个基本结构来构造的,HashMap也不例外.HashMap实际上是一个"链表散列"的数据结构,即数组和链表的结合体. 3.

Js实现hashMap

/** * MAP对象,实现MAP功能 * * 接口: * size() 获取MAP元素个数 * isEmpty() 判断MAP是否为空 * clear() 删除MAP所有元素 * put(key, value) 向MAP中增加元素(key, value) * remove(key) 删除指定KEY的元素,成功返回True,失败返回False * get(key) 获取指定KEY的元素值VALUE,失败返回NULL * element(index) 获取指定索引的元素(使用element.key