On Tue, 2017-05-16 at 14:01 +0800, derr...@thecopes.me wrote:
I am working on problem #8 of the euler project. see below. > > > > The four adjacent digits in the 1000-digit number that have the > greatest product are 9 × 9 × 8 × 9 = 5832. > > 73167176531330624919225119674426574742355349194934 > 96983520312774506326239578318016984801869478851843 > 85861560789112949495459501737958331952853208805511 > 12540698747158523863050715693290963295227443043557 > 66896648950445244523161731856403098711121722383113 > 62229893423380308135336276614282806444486645238749 > 30358907296290491560440772390713810515859307960866 > 70172427121883998797908792274921901699720888093776 > 65727333001053367881220235421809751254540594752243 > 52584907711670556013604839586446706324415722155397 > 53697817977846174064955149290862569321978468622482 > 83972241375657056057490261407972968652414535100474 > 82166370484403199890008895243450658541227588666881 > 16427171479924442928230863465674813919123162824586 > 17866458359124566529476545682848912883142607690042 > 24219022671055626321111109370544217506941658960408 > 07198403850962455444362981230987879927244284909188 > 84580156166097919133875499200524063689912560717606 > 05886116467109405077541002256983155200055935729725 > 71636269561882670428252483600823257530420752963450 > > Find the thirteen adjacent digits in the 1000-digit number that have > the greatest product. What is the value of this product? #!/usr/bin/perl use warnings; use strict; ( my $x = <<STUFF ) =~ s/\s+//g; 73167176531330624919225119674426574742355349194934 96983520312774506326239578318016984801869478851843 85861560789112949495459501737958331952853208805511 12540698747158523863050715693290963295227443043557 66896648950445244523161731856403098711121722383113 62229893423380308135336276614282806444486645238749 30358907296290491560440772390713810515859307960866 70172427121883998797908792274921901699720888093776 65727333001053367881220235421809751254540594752243 52584907711670556013604839586446706324415722155397 53697817977846174064955149290862569321978468622482 83972241375657056057490261407972968652414535100474 82166370484403199890008895243450658541227588666881 16427171479924442928230863465674813919123162824586 17866458359124566529476545682848912883142607690042 24219022671055626321111109370544217506941658960408 07198403850962455444362981230987879927244284909188 84580156166097919133875499200524063689912560717606 05886116467109405077541002256983155200055935729725 71636269561882670428252483600823257530420752963450 STUFF my @z = ( 0 ) x 5; while ( $x =~ / ( . ) (?= ( . ) ( . ) ( . ) ( . ) ( . ) ( . ) ( . ) ( . ) ( . ) ( . ) ( . ) ( . ) ) /xg ) { my $y = $1 * $2 * $3 * $4 * $5 * $6 * $7 * $8 * $9 * $10 * $11 * $12 * $13; @z = ( $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $y ) if $z[ -1 ] < $y; } print "@z\n"; __END__ -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/