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This question evaluates a candidate's ability to design and implement efficient data structures for caching, including understanding frequency-based eviction policies, maintaining recency ordering for tie-breaking, and meeting strict time-complexity guarantees.

  • medium
  • Salesforce
  • Coding & Algorithms
  • Software Engineer

Implement an LFU cache with O(1) operations

Company: Salesforce

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: medium

Interview Round: Onsite

Quick Answer: This question evaluates a candidate's ability to design and implement efficient data structures for caching, including understanding frequency-based eviction policies, maintaining recency ordering for tie-breaking, and meeting strict time-complexity guarantees.

Last updated: Jun 10, 2026
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