What are the common use cases for a SortedSet<T>?

Short answer: When you need a collection of unique elements in sorted order. Performing range queries or retrieving elements in sorted order. Implementing mathematical set operations efficiently. Examples: Leaderboards Scheduling tasks sorted by priority Auto-complete suggestions sorted alphabetically

Real-world example (ShopNest)

When applying a coupon, ShopNest keeps used coupon codes in a HashSet<string> so “already used?” checks stay fast and unique.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.