Advents of Code (programming challenges)

[pier4r]

I was thinking. Is there a way (in RPL) to store the compact map (without the unneeded columns) in something different than a matrix with integers or reals?

I was thinking about GROB objects or pictures, but those would be difficult to debug, as far as I know, as a pixel can either on or off.

Would be great if one could create a sort of bitmap but not only with bits, rather with, say, 4 values.