Interesting questions with follow-up that tackle scale, generics, and handling arbitrary input/conditions. The interviewers were friendly and well-prepared. I did not feel rushed by them at all.

Recommendations for others:

• Identify proper DS(s) to use.
• Identify a brute-force solution first.
• Manually solve by hand.
• Identify Big O before even writing code.
• Identify computational/space bottlenecks.
• Reduce to sub-problems and/or optimize.
• Code it out.