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[LeetCode]Insert Delete GetRandom O(1) - Duplicates allowed

题目描述:

LeetCode 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.

  1. insert(val): Inserts an item val to the collection.
  2. remove(val ...

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