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设计数据结构O1 insert delete和getRandom

设计一个数据结构满足O(1)的insert, delete和getRandom.这个是从地里Amazon的面经中看到的. 我们可以使用一个resizable数组arr以及一个HashMap来完成. insert(value): 将value加入到数组中,然后将<value, index> pair放到hashmap里 delete(value):  交换value和数组末端元素交换,从hashmap里去除掉value,然后减少当前数组的长度count. getRandom():先用Math.r…

LeetCode 380. Insert Delete GetRandom O(1)

380. Insert Delete GetRandom O(1) Add to List Description Submission Solutions Total Accepted: 21771 Total Submissions: 56175 Difficulty: Medium Contributors: Admin Design a data structure that supports all following operations in average O(1) time.…

[LeetCode] 380. Insert Delete GetRandom O(1) 插入删除获得随机数O(1)时间

Design a data structure that supports all following operations in average O(1) time. insert(val): Inserts an item val to the set if not already present. remove(val): Removes an item val from the set if present. getRandom: Returns a random element fro…

【LeetCode】380. Insert Delete GetRandom O(1) 解题报告（Python）

[LeetCode]380. Insert Delete GetRandom O(1) 解题报告(Python) 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/insert-delete-getrandom-o1/description/ 题目描述: Design a data structure that supports all following oper…

[Swift]LeetCode380. 常数时间插入、删除和获取随机元素 | Insert Delete GetRandom O(1)

Design a data structure that supports all following operations in averageO(1) time. insert(val): Inserts an item val to the set if not already present. remove(val): Removes an item val from the set if present. getRandom: Returns a random element from…

[LeetCode] Insert Delete GetRandom O(1) - Duplicates allowed 常数时间内插入删除和获得随机数 - 允许重复

Design a data structure that supports all following operations in average O(1) time. Note: Duplicate elements are allowed. insert(val): Inserts an item val to the collection. remove(val): Removes an item val from the collection if present. getRandom:…

[LeetCode] Insert Delete GetRandom O(1) 常数时间内插入删除和获得随机数

Design a data structure that supports all following operations in average O(1) time. insert(val): Inserts an item val to the set if not already present. remove(val): Removes an item val from the set if present. getRandom: Returns a random element fro…

381. Insert Delete GetRandom O(1) - Duplicates allowed

Design a data structure that supports all following operations in average O(1) time. Note: Duplicate elements are allowed. insert(val): Inserts an item val to the collection. remove(val): Removes an item val from the collection if present. getRandom:…

[LeetCode] 381. Insert Delete GetRandom O(1) - Duplicates allowed 常数时间内插入删除和获得随机数 - 允许重复

Design a data structure that supports all following operations in average O(1) time. Note: Duplicate elements are allowed. insert(val): Inserts an item val to the collection. remove(val): Removes an item val from the collection if present. getRandom:…

[LeetCode] 380. Insert Delete GetRandom O(1) 常数时间内插入删除和获得随机数

Design a data structure that supports all following operations in average O(1) time. insert(val): Inserts an item val to the set if not already present. remove(val): Removes an item val from the set if present. getRandom: Returns a random element fro…