Wait til you get to 24. That one was the most difficult for me. It's not really about programming, more like an old-fashioned logic puzzle.
On Wed, Jan 5, 2022 at 4:08 PM 'Michael Day' via Programming < programm...@jsoftware.com> wrote: > I don't think there are any spoilers here. > > Well, I have at last managed to do part 2 of day 22, one of those > "days" when part 2 is considerably harder > than part 1. (I've found day 22 the hardest so far: day 21 part2's > Dirac Die was tricky, because I'd forgotten every go > had 3 throws, but not really hard; day 19 was quite hard, needing > working out how to reconcile "scanners"; > I spent ages on day 18's snailfish having gone down a cul-de-sac with a > nested array approach!) > > It managed to run within a RAM of ~ 14GB usable at the expense of taking > 70 seconds! My data-structure > wasn't ideal to say the least, though the initial set of 420 "ops" > generated only ~ 43000 small objects. > The space actually used appears fo be ~9GB: > > 7!:2@] 'reboot2 data' > > 8721760 > > > There must be a better way, but at least this slow-coach method didn't > need a super-computer! > > I might inspect the efficiency, but probably not - it's taken too long > to find a working solution! > > Looking forward to Raul's posting next week! > > Cheers, > > Mike > > On 04/01/2022 13:49, 'Mike Day' via Programming wrote: > > As I recall, a killer question until one realises there’s no need to > preserve the order; then it’s just a matter of maintaining counts, as you > observe. > > > > I’m currently wondering how to acquire the tera- or peta-bytes of > storage to deal with day 22 part 2. Part 1 is easy, of course. No > spoilers, though. I haven’t given up yet! > > > > Cheers, > > > > Mike > > > > Sent from my iPad > > > >> On 4 Jan 2022, at 03:06, Raul Miller<rauldmil...@gmail.com> wrote: > >> > >> https://adventofcode.com/2021/day/14 > >> > >> For day 14, we were supposed to run a "polymerization sequence" for N > >> steps, and then find the difference in the quantity between the most > >> common and least common elements of the sequence. > >> > >> For part A, we were supposed to run 10 steps. For part B, we were > >> supposed to run 40 steps. > >> > >> The sample data looked like this: > >> > .............. [truncated] > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
