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March 21, 2018 19:34
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# Find the thirteen adjacent digits in the 1000-digit number that have the greatest product. What is the value of this product? | |
# real 0m2.053s | |
# user 0m1.960s | |
# sys 0m0.052s | |
# This is Rakudo version 2016.03-39-gf220a5e built on MoarVM version 2016.03-46-g50c7f6a | |
use v6; | |
my $num = '73167176531330624919225119674426574742355349194934' ~ | |
'96983520312774506326239578318016984801869478851843' ~ | |
'85861560789112949495459501737958331952853208805511' ~ | |
'12540698747158523863050715693290963295227443043557' ~ | |
'66896648950445244523161731856403098711121722383113' ~ | |
'62229893423380308135336276614282806444486645238749' ~ | |
'30358907296290491560440772390713810515859307960866' ~ | |
'70172427121883998797908792274921901699720888093776' ~ | |
'65727333001053367881220235421809751254540594752243' ~ | |
'52584907711670556013604839586446706324415722155397' ~ | |
'53697817977846174064955149290862569321978468622482' ~ | |
'83972241375657056057490261407972968652414535100474' ~ | |
'82166370484403199890008895243450658541227588666881' ~ | |
'16427171479924442928230863465674813919123162824586' ~ | |
'17866458359124566529476545682848912883142607690042' ~ | |
'24219022671055626321111109370544217506941658960408' ~ | |
'07198403850962455444362981230987879927244284909188' ~ | |
'84580156166097919133875499200524063689912560717606' ~ | |
'05886116467109405077541002256983155200055935729725' ~ | |
'71636269561882670428252483600823257530420752963450'; | |
my $windowSize = 13; | |
my $res = 0; | |
my $product = 1; | |
for $num.comb.rotor($windowSize => -($windowSize - 1)) -> @factors { | |
my $tmpProd = [*] @factors; | |
if $tmpProd > $product { | |
$product = $tmpProd; | |
$res = @factors.join; | |
} | |
} | |
say "Adj. $res gives product $product"; |
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