This problem seems very difficult to me and perhaps the most difficult so far. I thought about it for a long time on the plane and I think I have an idea to start trying out, but I don't think it is the complete solution. In any case I know I am bound to struggle with this one and haven't written any code for it yet. I haven't had time but I would like to at least attempt it.

At the very least, at least I have considered this problem.

All days / Day 13