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花花酱 LeetCode 380. Insert Delete GetRandom O(1)

Problem:

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 element from current set of elements. Each element must have the same probability of being returned.

 

Idea:

Hashtable + array

Time complexity:

O(1)

 

Solution:

 

Related Problems:

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