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Coding · System design
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Design a system that displays the top-N most popular content to users in real-time. The system must gather popularity signals (views, likes, shares), compute the…
Companies: Zalando, Atlassian
Last reported Sep 2026
Find the smallest substring of s that contains all characters of t (including duplicates), or return "" if none exists. This is typically solved with…
Companies: Zalando, Amazon, LinkedIn, Lyft +2
Hash Table · Sliding Window · String
Last reported Aug 2026