b was interesting- luckily, I remembered how to test if a point lives inside a curve. The line-crossing count algorithm was a little tricky to write from scratch, but I finally got there. Also, I screwed up for like an hour when I didn't realise you were supposed to count junk pipes as part of the territory. Code wise it got messy, and I've thrown something up on my github, but might try clean it up a little later.