Easy interview, but the interviewers are inexperienced.

Q1: How do you find a specific log in a server file without downloading logs?
A: Use grep command

Q2: Flip a bit in an integer
A: Use XOR

Q3: Given a code that contains synchronized keyword identify issues
A: Deadlocks, and make sure to fix it

Q4: Given a file system contains subdirectories and files, find TOP K words
A: Classic BFS. Use a Map to calculate frequencies, then add elements in Map to PQ while maintaining only K elements.