Top 50 efficiency Interview Questions
The most frequently asked efficiency questions across all roles and companies, ranked by real interview frequency. Updated daily.
Find each duplicated integer once using a hash set and preserve its first duplicate order.
Identify repeated transaction IDs in one pass using hash sets while preserving first duplicate appearance order.
NPCICompute cosine similarity for equal-length high-dimensional vectors in one pass with constant auxiliary space.
Information Technology Senior Management ForumWWestJetGroup Amazon Alexa event objects by a hashable property while preserving the original order within each group.
Informatica
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Recursively filter Palo Alto Networks JSON by blocked paths using a trie to prune excluded subtrees efficiently.
Palo Alto Networks
Persistent SystemsReturn the path to a Bloomberg Terminal topic in a nested hierarchy using iterative depth-first search.
Bloomberg
Ethos LifeCount valid Unity asset build orders with prerequisite constraints using bitmask dynamic programming.
Unity
Unity TechnologiesImplement a per-client sliding-window rate limiter using hash maps and queues.
Datadog
TikTok
Dave