tools/hashTest.hs
author Wuzzy <almikes@aol.com>
Fri, 06 May 2016 17:26:06 +0200
changeset 11814 8eccc307ca1e
parent 9464 901e363d5837
permissions -rw-r--r--
Frontend: Increase space for help text in the footer
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module Test where
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import Control.Monad
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import Data.Word
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import qualified Data.IntSet as IS
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data OP = Sum
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        | Mul
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        | Sub
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    deriving Show
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genOps :: Int -> [[OP]]
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genOps 1 = [[Sum], [Mul], [Sub]]
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genOps n = [a : as | a <- [Sum, Mul, Sub], as <- genOps (n - 1)]
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genPos :: Int -> Int -> [[Int]]
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genPos m 1 = map (:[]) [-m..m - 1]
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genPos m n = [a : as | a <- [-m..m - 1], as <- genPos m (n - 1)]
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hash :: [Int] -> [OP] -> [Int] -> Int
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hash poss op s = foldl applyOp s' (zip ss op)
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    where
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        applyOp v (n, Sum) = (v + n) `mod` 256
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        applyOp v (n, Mul) = (v * n) `mod` 256
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        applyOp v (n, Sub) = (v - n) `mod` 256
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        (s' : ss) = map (\p -> if p >= 0 then s !! p else s !! (l + p)) poss
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        l = length s
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test = do
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    a <- liftM lines getContents
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    let w = minimum $ map length a
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    let opsNum = 4
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    let opsList = genOps (opsNum - 1)
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    let posList = genPos w opsNum
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    let target = length a
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    let wordsList = map (map fromEnum) a
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    let hashedSize = IS.size . IS.fromList
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    print $ length a
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    putStrLn . unlines . map show $ filter (\l -> fst l == length a) $ [(hs, (p, o)) | p <- posList, o <- opsList, let hs = hashedSize . map (hash p o) $ wordsList]
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didIunderstand' = do
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    a <- liftM lines getContents
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    print $ length a
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    print . IS.size . IS.fromList . map (testHash . map fromEnum) $ a
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    where
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        testHash s = let l = length s in (
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                         (s !! (l - 2) * s !! 1) + s !! (l - 1) - s !! 0
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                         ) `mod` 256