@JBocher ,
Welcome to the forum – great to have you here! Blowing through half the Problems of the Week in a single morning is quite the “drop the mic” introduction – very impressive!
Your solution here looks great. When you have a chance, you may want to go through the other entries in each problem – in almost every case people took very different approaches, and there are some extremely innovative and interesting solutions in each one that I know I learned a lot from.
Also, don’t know if you have yet explored the Enterprise DNA Data Challenges, but from the look of things it seems they would be right in your wheelhouse. We just opened Data Challenge #15, which goes on until August 22.
- Brian