Time Based Key-Value Store

Hash map + binary search · Search the latest valid timestamp · Stretch · about 30 min

Why it matters

Real interview problems often combine two familiar structures instead of requiring a new one.

How it connects

This combines a map for the right record with boundary binary search inside its ordered history.

Try first

For one key, what ordered list do you need to keep after every set operation?

Interview cue

The map narrows to one history, then binary search finds the latest value valid at that time.