The Category Ranker

A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

medium

Seniority

senior

Problem

The feature store emits thousands of scored records across dozens of categories, and the serving layer needs only the top performers from each group for real-time inference. Write a function that groups records by category and returns the top N per category, sorted by value descending. Ties should preserve the original insertion order.

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