Day 4: Printing Department
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That’s a great addition :D
Running my own input I also noticed that your solution is a lot faster than mine (processing each roll individually). I’ll keep that 2D-rotation in mind for the future.
Yeah, that’s one thing the gurus keep hammering home: anything you can move out of loop constructs (inc rows, partition, etc as well as the obvious do, repeat) and handle pervasively is a big win.