I have found a solution someone posted [0]

It looks similar to what I though I had to write, but I will have to reread it and the documentation to understand it well.

And day 2 seems a bit too complex with my meager J knowledge. OTOH with the J interpreter for android and its terseness it seems the most suited language for programming on a phone, so I will probably stick to it.

[0] https://www.reddit.com/r/adventofcode/comments/e4axxe/2019_d...

I'm actually surprise how many J/APL/K/Q solutions get posted there already. It seems to be popular among golfers.

If you haven't already found the discussion, Reddit is very active and very helpful. Seems to be the primary water cooler for the event.

https://www.reddit.com/r/adventofcode/

I'd argue /g/ on 4chan is actually. 3-4 threads get filled a day (~300 replies each).

It's honestly the only real reason to go on /g/ (or really 4chan in general) for me.