Jacobi symbol: Difference between revisions
Content added Content deleted
(→{{header|Haskell}}: Replaced a do with a (let ... in ...) (No monad used or needed here)) |
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import Data.List.Split (chunksOf) |
import Data.List.Split (chunksOf) |
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import Data.Bool (bool) |
import Data.Bool (bool) |
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jacobi :: Int -> Int -> Int |
jacobi :: Int -> Int -> Int |
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jacobi = go |
jacobi = go |
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go 0 _ = 0 |
go 0 _ = 0 |
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go x y |
go x y |
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| even r = |
| even r = plusMinus (rem y 8 `elem` [3, 5]) (go (div r 2) y) |
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| otherwise = |
| otherwise = plusMinus (3 == rem r 4 && 3 == rem y 4) (go y r) |
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where |
where |
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plusMinus = bool id negate |
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r = rem x y |
r = rem x y |
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-------------------------- TEST --------------------------- |
-------------------------- TEST --------------------------- |
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main :: IO () |
main :: IO () |
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main = putStrLn $ jacobiTable 11 9 |
main = putStrLn $ jacobiTable 11 9 |
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------------------------- DISPLAY ------------------------- |
------------------------- DISPLAY ------------------------- |
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jacobiTable :: Int -> Int -> String |
jacobiTable :: Int -> Int -> String |
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(justifyRight w ' ' [] ++ " " ++ unwords (rjust <$> cols)) : |
(justifyRight w ' ' [] ++ " " ++ unwords (rjust <$> cols)) : |
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replicate (length $ head rowLines) '-' : rowLines |
replicate (length $ head rowLines) '-' : rowLines |
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justifyRight :: Int -> a -> [a] -> [a] |
justifyRight :: Int -> a -> [a] -> [a] |
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justifyRight n c = (drop . length) <*> (replicate n c ++)</lang> |
justifyRight n c = (drop . length) <*> (replicate n c ++)</lang> |
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