Implement a Time-Based Key-Value Store
Last updated: August 14, 2026
Quick Overview
The question asks the candidate to implement a time-based key-value store, where keys can be associated with values that are valid only at specific timestamps.
Oracle
August 14, 20260
0
5 solved
The question asks the candidate to implement a time-based key-value store, where keys can be associated with values that are valid only at specific timestamps.
This question is typically asked during the onsite interview round to assess a candidate's coding and algorithm skills. Interviewers evaluate the candidate's ability to design efficient data structures and algorithms, as well as their understanding of time complexity and storage optimization. It helps determine how well the candidate can translate a problem statement into a functional solution.
What the Interviewer Expects
- Clearly define the data structure to store keys, values, and timestamps.
- Implement methods to set and get values based on timestamps.
- Optimize for time complexity in both setting and getting values.
- Discuss edge cases and how the solution handles them.
- Provide a brief explanation of the approach taken.
Key Topics to Cover
How to Approach This
- Clarify input constraints and edge cases before writing code.
- Walk through your approach verbally and confirm with the interviewer before coding.
- Start with a brute force solution, then optimize. Mention time and space complexity.
- Test your solution with examples, including edge cases like empty input or duplicates.
- Consider common patterns: sliding window, two pointers, hash map, BFS/DFS, dynamic programming.
Possible Follow-up Questions
- How would you handle concurrent access to the store?
- What modifications would you make for large-scale data?
- Can you explain how you would test your implementation?
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Practice DSA ProblemsSample Answer
Approach
To implement a time-based key-value store, I will use a combination of a dictionary and a list. The dictionary will map each key to a list of tuples, where each tuple contains a timestamp and the corr...
Algorithm
- Set Method: When setting a value for a key at a specific timestamp, append the tuple (timestamp, value) to the list associated with that key in the dictionary.
- Get Method: To retrieve a ...
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