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__
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