Top-K Ads from Log + Sliding-Window Ingest

Question

Two-part ads round: (1) given a static impression log, return the top-K advertisers by impression count; (2) extend to a streaming `ingestImpressions` that scores the top-K within a sliding time windo...

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Community-reported Pinterest interview question with 1 related discussion. The full write-up and related discussions are available to members.

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