Search⌘ K
AI Features
Home
Courses
Grokking the Coding Interview Patterns

Solution: Time Based Key-Value Store

Explore how to implement a custom time-based key-value store that supports storing multiple values for the same key at different timestamps. Learn to retrieve values efficiently using binary search, optimizing time complexity for get operations, and understand the tradeoffs in data structure design for scalable coding solutions.

We'll cover the following...

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:

  • 1≤1 \leq key.length, value.length ≤20\leq 20
  • key and value consist of lowercase English letters and digits.
  • 1≤1
...