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Ok, at some point we made a big mistake. (lemmy.world)

submitted 9 months ago* (last edited 9 months ago) by [email protected] to c/[email protected]

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Hacker News post about this: https://news.ycombinator.com/item?id=39309783 (source available)

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[–] [email protected] 29 points 9 months ago (1 children)

I like to think I can usually look at code in languages I don't know and still get the gist of what it does but I am drawing a complete blank. Is this even slightly legible to anyone and if yes please explain

[–] [email protected] 44 points 9 months ago

TL;DR: Grid<A,B,C,D,E,F,G,H> simplifies to true, if and only if it is a 3x3 magic square.

full explanation

Fifteen is an array of length 15
T<A,B,C> checks if an array of length A+B+C is equivalent to an array of length 15, thus checking if A+B+C is equal to 15
And<A,X> is simplifies to X if A is true, else it simplifies to false
Df<A,B,X> checks if A and B are Diffrent , simplifying to X if they are
Grid<A,B,C,D,E,F,G,H> first checks if every row, column and diagonal is equal to 15, then checks if every item is unique.