[bhilburn]

The docs and interface look great, and it's nice that each one comes with a sort of mini-walkthrough.

If any Google devs read this, I do have one request: it would be awesome to see runtime analysis based on the theory / design of the provided code, with perhaps some explanation of why certain design decisions were made in the solution.

It's already an excellent educational tool, and this seems like an easy way to make it even better.