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Trending Questions
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We need to design a system that can limit API requests across multiple regional data centers. The rate limiter needs to support millions of active users, handle rules per tier, and maintain <5ms latency overhead.
Implement a function to merge `k` sorted lists of numbers. Assume the total size of all lists fits in memory, but discuss optimizations if the lists are stored across multiple disk blocks or servers.
Explain how to design an idempotency key database schema and middleware that prevents duplicate form submissions. How do you handle cases where a client retries while the first request is still running?
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