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Solve classic troubleshooting & algorithm tasks

BoxSoftware Engineer · Onsite
MediumSoftware EngineerOnsiteCoding & Algorithms

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This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Solve classic troubleshooting & algorithm tasks states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

Question

System failure troubleshooting: You can only SSH into the machine and the log file is huge. How would you locate the problem quickly?

Flip a bit: Given an integer num and a bit position, flip that bit.

Concurrency bug: Given multithreaded code that uses locks, find and fix the deadlock.

Word frequency top-K: Given a directory that may contain nested sub-directories and files, count word frequencies across all files and return the top-K words. Follow-ups: handle too many files to fit in memory (MapReduce vs Count-Min Sketch + Space-Saving).