You'll learn heap-based streaming. The pattern extends to Find Median from Data Stream, which uses TWO heaps. If you can't maintain a heap invariant across insertions, you'll fail streaming problems. Amazon asks these for real-time analytics scenarios. The single-heap pattern here prepares you for the two-heap median problem next.
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$ curl repovive.com/roadmaps/maang-interview-prep/heaps-priority-queues/kth-largest-stream-why-this-problem
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