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[LeetCode] 381. Insert Delete GetRandom O(1) - Duplicates allowed 插入删除和获得随机数O(1)时间 - 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 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(C++/Java)

题目: Design a data structure that supports all following operations in averageO(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. getRand…

[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 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…

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

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常数时间插入删除取随机值

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

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…

[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) 、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…

[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…