40 lines
1.3 KiB
Haskell
40 lines
1.3 KiB
Haskell
import Data.Char
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main = do
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cont <- getContents
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let content = drop 5977377 (concat (replicate 10000 (map digitToInt $ init cont) ))
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let test1 = doStepsP2 content 100
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putStrLn (show $ length content)
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--mapM putStrLn (map show patter)
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putStrLn (show $ take 8 test1)
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getPatternForIndex :: [Int] -> Int -> Int -> [Int]
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getPatternForIndex patter length index = drop (1 + index) $ take (length +1) (cycle base)
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where base = concat $ map (replicate (index+1)) patter
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getInputForIndex :: [Int] -> Int -> [Int]
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getInputForIndex xs index = drop index xs
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get :: [Int] -> Int
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get xs = mod (abs $ (sum xs)) 10
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step :: [Int] -> [[Int]] -> [Int]
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step xs patterns = map (\(a,b) -> get( zipWith (*) a b)) $ zip inputs patterns
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where inputs = map (getInputForIndex xs) [0..(length patterns)]
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doSteps :: [Int] -> [[Int]] -> Int -> [Int]
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doSteps xs patterns cnt
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| cnt == 0 = xs
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| otherwise = doSteps (step xs patterns) patterns (cnt -1)
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stepP2 :: [Int] -> Int -> [Int] -> [Int]
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stepP2 xs sumIn acc
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| sumIn == 0 = reverse acc
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| sumIn > 0 = stepP2 (drop 1 xs) (sumIn - (head xs)) ((mod sumIn 10):acc)
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doStepsP2 :: [Int] -> Int ->[Int]
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doStepsP2 xs cnt
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| cnt == 0 = xs
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| otherwise = doStepsP2 (stepP2 xs (sum(xs)) []) (cnt -1)
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