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Kth Largest Element in a Stream
Kth Largest Element in a Stream is about always pulling the next best option efficiently as the data changes. It's a great warm-up that builds priority-based reasoning without a ton of moving parts. If your heap represents best candidates right now, the rest falls into place.
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Low-Level Design Interview Questions
Low-level design problems test whether you can model a small API, preserve invariants, and choose storage that matches the required operations. Expect recurring shapes like rate limiters, hit counters, tic-tac-toe, file systems, and autocomplete.
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