Yaay!
I agree with 15: I solved it pretty quickly and I like my solution, but what makes me really happy is that I'm pretty sure I couldn't have solved it a few years ago.
Also day 11 (Plutonian pebbles): it's such a simple problem, and part two is a perfect example of how and why to use dynamic programming. I've been encouraging everyone to try it.
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Many fond memories of using RISC OS as a kid. It's good to know that it's still alive!