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Decode the Coding Interview in Swift: Real-World Examples

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

Explore how to implement a data structure that allows duplicates and supports insert, remove, and getRandom operations all in average constant time. Understand the challenges of handling duplicates and learn techniques to efficiently perform these operations for real-world interview problems.

We'll cover the following...

Problem statement

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

  • insert(data): This function should insert data into the set (if the set does not contain it already). It should return false if the data already exists in the set. Otherwise, it should return true.
  • remove(data): If the data is present, this function should remove data from the set and return true. If the data 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