ScrollingText

index = 0
largest = 0
long_number = """73167176531330624919225119674426574742355349194934
96983520312774506326239578318016984801869478851843
85861560789112949495459501737958331952853208805511
12540698747158523863050715693290963295227443043557
66896648950445244523161731856403098711121722383113
62229893423380308135336276614282806444486645238749
30358907296290491560440772390713810515859307960866
70172427121883998797908792274921901699720888093776
65727333001053367881220235421809751254540594752243
52584907711670556013604839586446706324415722155397
53697817977846174064955149290862569321978468622482
83972241375657056057490261407972968652414535100474
82166370484403199890008895243450658541227588666881
16427171479924442928230863465674813919123162824586
17866458359124566529476545682848912883142607690042
24219022671055626321111109370544217506941658960408
07198403850962455444362981230987879927244284909188
84580156166097919133875499200524063689912560717606
05886116467109405077541002256983155200055935729725
71636269561882670428252483600823257530420752963450""".replace("\n", "")
 
while index + 4 < len(long_number):
    product = 1
    section = long_number[index:index + 5]
    for i in section:
        product *= int(i)
    if product > largest:
        largest = product
    index += 1
 
print "answer: ", largest

fix = [int(x) for x in long_number]
 
while index + 4 < len(fix):
    product = 1
    section = fix[index:index + 5]
    for i in section:
        product *= i
    if product > largest:
        largest = product
    index += 1

main = do str <- readFile "pb8_data.txt"
          let digits = map ((read::String->Int) . (\c -> [c])) $ concat $ lines str
          print $ maximum $ foldr (zipWith (*)) (repeat 1) $ take 5 $ iterate tail digits

#!/usr/bin/perl
use strict;
use warnings;
use feature 'say';
use syntax 'gather';
use List::Util qw(max reduce);
 
say max gather {
  my @nums;
  while (<DATA>) {
    while (/(\d)/g) {
      push @nums, $1;
      shift @nums if @nums > 5;
      take reduce { $a * $b } @nums if @nums == 5;
    }
  }
}
 
__DATA__
73167176531330624919225119674426574742355349194934
...

use List::Util qw(max);
 
my $max = 0;
$input  =~ /(.)(.)(.)(.)(.)(?{ $max = max( $max, $1 * $2 * $3 * $4 * $5) })(*FAIL)/;
 
say $max;

use List::Util qw(max reduce);
 
my $max = 0;
multimatch { $max = max( $max, reduce { $a * $b } @_ ) } qr/(.)(.)(.)(.)(.)/, $input;
say $max;

seq = '''73167176531330624919225119674426574742355349194934
96983520312774506326239578318016984801869478851843
85861560789112949495459501737958331952853208805511
12540698747158523863050715693290963295227443043557
66896648950445244523161731856403098711121722383113
62229893423380308135336276614282806444486645238749
30358907296290491560440772390713810515859307960866
70172427121883998797908792274921901699720888093776
65727333001053367881220235421809751254540594752243
52584907711670556013604839586446706324415722155397
53697817977846174064955149290862569321978468622482
83972241375657056057490261407972968652414535100474
82166370484403199890008895243450658541227588666881
16427171479924442928230863465674813919123162824586
17866458359124566529476545682848912883142607690042
24219022671055626321111109370544217506941658960408
07198403850962455444362981230987879927244284909188
84580156166097919133875499200524063689912560717606
05886116467109405077541002256983155200055935729725
71636269561882670428252483600823257530420752963450
'''.split('\n')[:-1]
 
seq = [ int(x) for x in list(''.join(seq))]
 
products = [ reduce( lambda a,b: a*b, seq[i:i+5]) for i in range(0,len(seq)-4)]
print max(products)

module Main where
 
    import Data.Char
    import Data.List
 
    investigateThis :: [Int]
    investigateThis = map digitToInt $ show 7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450
 
    largestProductOfN :: (Num a, Ord a) => Int -> [a] -> a
    largestProductOfN n = maximum . map (product .take n) . tails
 
    main :: IO()
    main = print $ largestProductOfN 5 investigateThis

from collections import deque
from operator import mul
 
#your code for getting the integer list
deq = deque([], 5)
m = None
 
for num in digit_list:
    deq.append(num)
    m= max(reduce(mul, deq), m)

import operator
x = [int(c) for c in string_of_1000_digits]
print max(reduce(operator.mul, x[n:n+5]) for n in range(len(x)))

(defn euler008 [s]
    (apply max (map (partial reduce *) 
         (partition 5 1 (map #(Character/getNumericValue %) s)))))    
 
(time (println (euler008 *test-string*)))

#!/usr/bin/perl
 
my $input =
  "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450";
 
my $length = length $input;
my $max     = 0;
for my $i (0 .. $length) {
    if ($i <= ($length - 5)) {
        my $product = substr($input, $i, 1); 
        next if $product == 0;
        $product *= substr($input, $i+$_, 1) for (1 .. 4); 
        $max = $product if $product > $max;
    }   
}   
 
print "$max\n";