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Code-golf is a competition to solve a particular problem in the fewest bytes of source code.

7 votes

Hexagonal adjacency

Elixir, 263 257 264 223 214 218 214 bytes a=fn x,y->i=&(&1*(&1-1)*3+1) [x,y]=Enum.sort [x,y] if x<1,do: y in 1..6,else: (y-x==1||fn->a=y-trunc i.((r=(:math.sqrt(12*x-3)+3)/6)+1) t=trunc r a in [0,1,r …
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