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Grokking the Coding Interview Patterns in C++

Time Based Key-Value Store

Explore how to implement a time based key-value store to store and retrieve key values by timestamp. Understand the design of the TimeStamp class with set and get functions, handling timestamp queries and constraints. Develop skills to solve similar data structure problems efficiently.

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Statement

Implement a data structure that can store multiple values of the same key at different timestamps and retrieve the key’s value at a certain timestamp.

You’ll need to implement the TimeStamp class. This class has the following functions:

  • Init(): This function initializes the values dictionary and timestamp dictionary.

  • Set Value(key, value, timestamp): This function stores the key and value at any given timestamp.

  • Get Value(key, timestamp): This function returns the value set for this key at the specified timestamp.

Note: When a query requests the value of a key at a timestamp that isn’t recorded, return the value corresponding to the most recent timestamp before the query’s timestamp. If there are no timestamps before the query’s timestamp, return an empty string.

Constraints:

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