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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:…

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Leetcode: 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: Insert Delete GetRandom O(1)

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] 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

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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) 插入删除获得随机数O(1)时间

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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

原题链接在这里:https://leetcode.com/problems/insert-delete-getrandom-o1-duplicates-allowed/?tab=Description 题目: Design a data structure that supports all following operations in average O(1) time. Note: Duplicate elements are allowed. insert(val): Inserts a…

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

380. Insert Delete GetRandom O(1) 实现插入.删除.获得随机数功能,且时间复杂度都在O(1).实际上在插入.删除两个功能中都包含了查找功能,当然查找也必须是O(1). 数组可以实现插入.删除.获得随机数O(1),但查找就不行了.(当然对于数组,直接删除的时间复杂度不是O(1),因为可能需要移动) hash.set都是红黑树实现的,查找.插入.删除的时间复杂度在O(logn). unordered_map.unordered_set是哈希表实现的,查找.插入.删除的…

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

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…

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LeetCode 380. Insert Delete GetRandom O(1) 常数时间插入、删除和获取随机元素(C++/Java)

题目: 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…

[leetcode]380. Insert Delete GetRandom O(1)设计数据结构，实现存，删，随机取的时间复杂度为O(1)

题目: Design a data structure that supports all following operations in average O(1) time.1.insert(val): Inserts an item val to the set if not already present.2.remove(val): Removes an item val from the set if present.3.getRandom: Returns a random elem…

381 Insert Delete GetRandom O(1) - Duplicates allowed O(1) 时间插入、删除和获取随机元素 - 允许重复

设计一个支持在平均 时间复杂度 O(1) 下, 执行以下操作的数据结构.注意: 允许出现重复元素.    insert(val):向集合中插入元素 val.    remove(val):当 val 存在时,从集合中移除一个 val.    getRandom:从现有集合中随机获取一个元素.每个元素被返回的概率应该与其在集合中的数量呈线性相关.示例:// 初始化一个空的集合.RandomizedCollection collection = new RandomizedCollection();…

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

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381. Insert Delete GetRandom O(1) - Duplicates allowed允许重复的设计1数据结构

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380. Insert Delete GetRandom O(1) 设计数据结构：在1的时间内插入、删除、产生随机数

［抄题］: 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 eleme…

[LC] 380. Insert Delete GetRandom O(1)

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 381.Insert Delete GetRandom

这道题中要求使用O(1)的方法来删除和插入元素的,那么首先需要寻找到对应的元素,这个可以使用map的O(1)的查询时间的,然后是删除对应的元素的,那么可以根据 堆排序中类似的做法把最后面的元素插入到前面来并且置换掉对应的值的. class RandomizedCollection { public: /** Initialize your data structure here. */ RandomizedCollection() { } /** Inserts a value to the c…

Insert Delete GetRandom O(1) I & II

Design a data structure that supports all following operations in 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 from current…

380. Insert Delete GetRandom O(1)

经过昨天的消沉 今天我振作了 设计个数据结构,添加,删除,随机获取都是O(1). 怎么会有这么牛逼的数据结构,所以肯定相应的要耗费空间. 添加和获取耗时O(1)是Array的特性,或者说是Map/Table的特性,思考下php的array就明白其实是index的mapping了. Random要求O(1)那就是需要知道数据结构的大小,并且保证储存的元素是相邻的. 其实就是一个table/map,KEY是添加的元素,value是他储存在array中的位置: 然后一个array和上面的table/m…

Insert Delete GetRandom O(1)

2018-07-15 18:36:29 问题描述: 问题求解: private ArrayList<Integer> ls; private HashMap<Integer, Integer> map; private Random rand; /** Initialize your data structure here. */ public RandomizedSet() { ls = new ArrayList<>(); map = new HashMap<…