10 lines
385 B
Haskell
10 lines
385 B
Haskell
import Data.List (transpose)
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import Text.Printf (printf)
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-- spiral is the first row plus a smaller spiral rotated 90 deg
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spiral 0 _ _ = [[]]
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spiral h w s = [s .. s+w-1] : rot90 (spiral w (h-1) (s+w))
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where rot90 = (map reverse).transpose
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-- this is sort of hideous, someone may want to fix it
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main = mapM_ (\row->mapM_ ((printf "%4d").toInteger) row >> putStrLn "") (spiral 10 9 1)
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