00:23:42 <esolangs> [[Marble Machine]] https://esolangs.org/w/index.php?diff=105583&oldid=105535 * Masalt * (+6) /* Factorial */
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04:34:19 <int-e> fizzie: The thing I realized for day 16 is that gur gjb ntragf npg vaqrcraqragyl (trarengvat frcnengr sybjf), nf ybat nf gurl arire bcra gur fnzr inyir, naq gung vf fbzrguvat bar pna rafher nsgre rahzrengvat gur orfg svany fgngrf sbe n fvatyr ntrag. Naq sbe n fvatyr ntrag, gur ahzore bs fgngrf qbrf abg rkcybqr arneyl nf zhpu (nf jr xabj sebz cneg 1).
04:40:44 <esolangs> [[Feta]] https://esolangs.org/w/index.php?diff=105584&oldid=83241 * Masalt * (+196)
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08:31:19 <int-e> Ah, pointers are so much fun. (I managed to get today's part 2 down to 30ms. Not in Rust, in C++, because of excessive use of (raw) pointers.)
09:24:03 <int-e> fizzie: I found a few additional pruning opportunities for day 19, now it's 14ms for part 2 (sample and input). But yeah, nothing nice. Also everything I have is hard-coded for the particular dependency graph in that problem.
09:28:05 <fizzie> I ended up with ~350ms for day 19 altogether.
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09:38:20 <fizzie> As for day 16, I did notice gung vs lbh xarj va nqinapr juvpu fhofrg bs inyirf ner tbvat gb or bcrarq ol bar ntrag, lbh pbhyq eha cneg 1 hazbqvsvrq (sbe gung fhofrg bs inyirf), naq gura ntnva va gur pbzcyrzrag, naq nqq gur gjb ahzoref. Ohg gurer frrzrq gb or fb znal qvssrerag cnegvgvbavatf, gung qvqa'g vzzrqvngryl uryc.
09:41:00 <int-e> fizzie: Lrnu vg bayl cnlf bss orpnhfr lbh pna erhfr gur shyy frnepu erfhygf sbe gur frpbaq ntrag, vs lbh erzrzore gur frg bs bcrarq inyirf.
09:41:30 <int-e> (With some caveats concerning pruning... I have no pruning anymore.)
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12:17:54 <fizzie> For day 20 I got 170 ms total in Go from the fgenvtug-sbejneq qbhoyl yvaxrq yvfg ba gbc bs na neenl bs abqrf, naq vgrengvat gb gur orggre qverpgvba. All those pointer safety checks, I guess. Unless there's something better.
12:18:21 <fizzie> Also reminded me of https://adventofcode.com/2020/day/23 a bit.
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12:24:09 <fizzie> (I do wonder if you could use a fxvc yvfg fbeg bs n guvat though.)
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12:39:53 <int-e> V hfrq n ovanel gerr jvgu svkrq abqrf sbe gur yrnsf naq hc-yvaxf. N zrff...
12:40:17 <int-e> (but (ohg vg nibvqf gur yvarne fpna)
12:41:33 <int-e> Also that was the post-mortem; I did something way more naive for the first solution. The usual trade-off between writing code fast and writing fast code...
12:42:46 <int-e> V qvq abg gel gb onynapr gur gerr gubhtu, rkprcg qhevat vavgvnyvmngvba; gur vachgf frrzrq enaqbz rabhtu.
12:44:42 <int-e> I wonder whether your idea is simpler, hmm.
12:46:42 <fizzie> My input is exactly 5000 items; I was thinking V'q whfg nqq na nqqvgvbany ceri/arkg cbvagre gb rirel gubhfnaqgu abqr, hfr gubfr va gur yvarne fpna, naq gura svkhc gur nssrpgrq barf.
12:47:19 <fizzie> I don't think it's going to end up pretty, implementation-wise. And, well, will have to save that to post-workday.
12:48:13 <int-e> That doesn't sound so bad actually.
12:49:06 <fizzie> I guess you could also vafgrnq bs gelvat gb xrrc gur fxvc cbvagref rdhnyyl fcnprq, whfg erpbeq gur qvfgnapr gurl fxvc naq svk gubfr hc, zvtug or fvzcyre gb vzcyrzrag.
12:49:17 <int-e> (Don't think of it as a skip-list; rather, think of it as a fixed-size uniform index into the doubly linked list. I'd s/thousand/hundred/.)
12:49:30 <int-e> I meant to rot13 that
12:50:34 <int-e> fizzie: I think the first idea is a tad simpler, as long as you don't mind having sqrt(n) instead of log(n) asymptotically.
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15:26:35 <fizzie> int-e: Couldn't leave it alone, and it does seem to work; with a spacing of 50 (a little better than 100; a lot better than 1000) the Go code takes 14 ms. Had quite a bit of trouble getting the edge cases where the item being moved is part of the index either before or after the move (or both) correct.
15:27:53 <int-e> yeah, 100 makes sense if you pick the closer... fencepost, I guess
15:29:05 <int-e> Oh wait that would suggest 50, but maintaining the lower part is more expensive per item. Yeah, 100 makes sense.
15:30:17 <int-e> I'm not thinking straight.
15:31:30 <int-e> Should've been "Oh wait that would suggest 100, but maintaining the lower part is more expensive per item. Yeah, 50 makes sense."
15:35:09 <int-e> fizzie: I have separate delete and insert operations, which reduces the risk of messing up the edge cases. In your context that would probably be a bit more expensive though.
15:35:50 <int-e> But at least today we had an interesting underlying data structure problem. :)
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15:42:09 <fizzie> Numbers just for completeness: https://0x0.st/o5mv.txt
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17:27:08 <esolangs> [[Shut up]] N https://esolangs.org/w/index.php?oldid=105585 * Masalt * (+103) Created page with "{{lowercase}}{{stub}} {{WIP}} '''shut up''' is a joke [[brainfuck]] derivative made by [[User:masalt]]."
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18:07:59 <Sgeo> OCaml 5 released. Is its effect handlers a good excuse to learn OCaml?
18:09:42 <Sgeo> ...I'd have to learn OCaml itself to get to the fun stuff
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18:28:43 <esolangs> [[Shut up]] https://esolangs.org/w/index.php?diff=105586&oldid=105585 * Masalt * (+657)
18:34:17 <esolangs> [[Shut up]] https://esolangs.org/w/index.php?diff=105587&oldid=105586 * Masalt * (-4)
19:53:47 <zzo38> If I want to make up a new escape code in a terminal emulator to switch the code page to a specified code page number, what code should be used?
19:55:51 <zzo38> Is there an escape code to switch into or out of doorway mode? If not, what code should be used?
20:00:01 <zzo38> There is a switch for doorway mode, which is CSI=255h
20:02:13 <zzo38> (In doorway mode, a null prefix can be used to treat the next character as a graphic character even if it would ordinarily be a control character, which is necessary for some code pages.)
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21:43:54 <esolangs> [[EsoFur]] M https://esolangs.org/w/index.php?diff=105588&oldid=105398 * TaserTheFox * (-8)
21:49:07 <esolangs> [[Quudo]] https://esolangs.org/w/index.php?diff=105589&oldid=105582 * SwitchU42 * (+63)
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23:48:18 <esolangs> [[Flame]] M https://esolangs.org/w/index.php?diff=105590&oldid=80601 * PythonshellDebugwindow * (+96) Stub, categories, unpipe