W in Wordlist, length(W,10), maplist(\L^memberchk(L,W),[a,b,c]), nth(10,W,k). | Hacker News

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		Avshalom on Nov 14, 2023 \| parent \| context \| favorite \| on: Designing a programming language to speedrun Adven... `W in Wordlist, length(W,10), maplist(\L^memberchk(L,W),[a,b,c]), nth(10,W,k).`

jodrellblank on Nov 14, 2023 [–]

I think memberchk will do one check for each letter (not checking the rest of the list and leaving no choice point) rather than checking each letter is present only once.

Avshalom on Nov 14, 2023 | [–]

Oh, yeah, my brain skipped over that part of the constraint. Does ruin the simplicity a bit.

  (findall(C,member(L,W),S),length(S,1))

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