73 lines
2.9 KiB
Factor
73 lines
2.9 KiB
Factor
! Copyright (c) 2007, 2008 Aaron Schaefer.
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! See http://factorcode.org/license.txt for BSD license.
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USING: grouping math.order math.parser sequences project-euler.common ;
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IN: project-euler.008
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! http://projecteuler.net/index.php?section=problems&id=8
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! DESCRIPTION
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! -----------
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! Find the greatest product of five consecutive digits in the 1000-digit number.
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! 73167176531330624919225119674426574742355349194934
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! 96983520312774506326239578318016984801869478851843
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! 85861560789112949495459501737958331952853208805511
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! 12540698747158523863050715693290963295227443043557
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! 66896648950445244523161731856403098711121722383113
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! 62229893423380308135336276614282806444486645238749
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! 30358907296290491560440772390713810515859307960866
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! 70172427121883998797908792274921901699720888093776
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! 65727333001053367881220235421809751254540594752243
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! 52584907711670556013604839586446706324415722155397
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! 53697817977846174064955149290862569321978468622482
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! 83972241375657056057490261407972968652414535100474
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! 82166370484403199890008895243450658541227588666881
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! 16427171479924442928230863465674813919123162824586
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! 17866458359124566529476545682848912883142607690042
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! 24219022671055626321111109370544217506941658960408
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! 07198403850962455444362981230987879927244284909188
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! 84580156166097919133875499200524063689912560717606
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! 05886116467109405077541002256983155200055935729725
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! 71636269561882670428252483600823257530420752963450
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! SOLUTION
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! --------
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<PRIVATE
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: source-008 ( -- str )
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{
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"73167176531330624919225119674426574742355349194934"
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"96983520312774506326239578318016984801869478851843"
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"85861560789112949495459501737958331952853208805511"
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"12540698747158523863050715693290963295227443043557"
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"66896648950445244523161731856403098711121722383113"
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"62229893423380308135336276614282806444486645238749"
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"30358907296290491560440772390713810515859307960866"
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"70172427121883998797908792274921901699720888093776"
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"65727333001053367881220235421809751254540594752243"
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"52584907711670556013604839586446706324415722155397"
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"53697817977846174064955149290862569321978468622482"
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"83972241375657056057490261407972968652414535100474"
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"82166370484403199890008895243450658541227588666881"
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"16427171479924442928230863465674813919123162824586"
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"17866458359124566529476545682848912883142607690042"
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"24219022671055626321111109370544217506941658960408"
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"07198403850962455444362981230987879927244284909188"
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"84580156166097919133875499200524063689912560717606"
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"05886116467109405077541002256983155200055935729725"
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"71636269561882670428252483600823257530420752963450"
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} concat ;
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PRIVATE>
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: euler008 ( -- answer )
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source-008 5 clump [ string>digits product ] [ max ] map-reduce ;
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! [ euler008 ] 100 ave-time
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! 2 ms ave run time - 0.79 SD (100 trials)
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SOLUTION: euler008
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