How would you design a rate limiter for a web service to prevent abuse? What considerations would you take into account?

## Approach Identify key parameters such as user limits, time frames, and how to store current usage. Discuss trade-offs between accuracy and data storage. ## Complexity Effectively O(1) for basic checks; O(n) for more complex scenarios based on storage. ## Trade-offs Complexity vs. performance; accuracy vs. resource consumption.