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It's an algorithm question. If somebody gave me your solution in an interview I would ask them to solve the problem without a dependency. These questions are about demonstrating your ability to code whilst understanding space & time complexity.

Can you list ones you found valuable?

Goodharts Law applies here - "Any observed statistical regularity will tend to collapse once pressure is placed upon it for control purposes"

I searched the internet and found the source: https://github.com/BentonEdmondson/servitor