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Decode the Coding Interview in Java: Real-World Examples

DIY: Insert Delete GetRandom O(1) - Duplicates Allowed

Explore how to implement a RandomizedCollection class that supports insert, remove, and getRandom operations in constant time while allowing duplicates. Understand the problem constraints and apply data structure techniques to handle duplicates efficiently as used in Amazon-inspired coding challenges.

We'll cover the following...

Problem statement

Implement a set data structure that allows duplicates and can perform the following operations:

  • insert(val): This function should insert val into the set (if the set does not contain it already). It should return false if the val already exists in the set. Otherwise, it should return true.
  • remove(val): If the val is present, this function should remove val from the set and return true. If the val does not exist in the set, the function should return false.
  • getRandom(): This function should return a random element from the set in constant time.

Note: Your implementation should aim for constant running time (on average) for each operation. ...

Constraints