martedì 2 novembre 2010

Problem 8

Find the greatest product of five consecutive digits in the 1000-digit number.

import Data.List

digits :: [Int]
digits = map (read.(:[])) "73167176531330624919225119674426574742355349194934\
         \96983520312774506326239578318016984801869478851843\
         \85861560789112949495459501737958331952853208805511\
         \12540698747158523863050715693290963295227443043557\
         \66896648950445244523161731856403098711121722383113\
         \62229893423380308135336276614282806444486645238749\
         \30358907296290491560440772390713810515859307960866\
         \70172427121883998797908792274921901699720888093776\
         \65727333001053367881220235421809751254540594752243\
         \52584907711670556013604839586446706324415722155397\
         \53697817977846174064955149290862569321978468622482\
         \83972241375657056057490261407972968652414535100474\
         \82166370484403199890008895243450658541227588666881\
         \16427171479924442928230863465674813919123162824586\
         \17866458359124566529476545682848912883142607690042\
         \24219022671055626321111109370544217506941658960408\
         \07198403850962455444362981230987879927244284909188\
         \84580156166097919133875499200524063689912560717606\
         \05886116467109405077541002256983155200055935729725\
         \71636269561882670428252483600823257530420752963450"

solution = maximum $ foldl (zipWith (*)) (repeat 1) $ take 5 $ tails digits



Emblematic of life: it require more effort to express the problem than the solution.

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