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Project Euler - Problem 8

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euler-008.hs
Haskell
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
import Data.Char(digitToInt)
 
result = maximum . map product . filter ((==) 5 . length)
. f . map digitToInt $ digits
where f [] = []
f ns = take 5 ns : f (tail ns)
digits =
"73167176531330624919225119674426574742355349194934\
\96983520312774506326239578318016984801869478851843\
\85861560789112949495459501737958331952853208805511\
\12540698747158523863050715693290963295227443043557\
\66896648950445244523161731856403098711121722383113\
\62229893423380308135336276614282806444486645238749\
\30358907296290491560440772390713810515859307960866\
\70172427121883998797908792274921901699720888093776\
\65727333001053367881220235421809751254540594752243\
\52584907711670556013604839586446706324415722155397\
\53697817977846174064955149290862569321978468622482\
\83972241375657056057490261407972968652414535100474\
\82166370484403199890008895243450658541227588666881\
\16427171479924442928230863465674813919123162824586\
\17866458359124566529476545682848912883142607690042\
\24219022671055626321111109370544217506941658960408\
\07198403850962455444362981230987879927244284909188\
\84580156166097919133875499200524063689912560717606\
\05886116467109405077541002256983155200055935729725\
\71636269561882670428252483600823257530420752963450"

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