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Octocat-spinner-32-eaf2f5

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file 26 lines (20 sloc) 1.355 kb
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class Array
  def prod
    p = 1
    each do |x|
      p *= x
    end
    return p
  end
end

arr_of_nums = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450".split('').map(&:to_i)

start = 0
stop = 4

greatest_product = 0

while stop < arr_of_nums.size do
  prod = arr_of_nums[start..stop].prod
  greatest_product = prod if prod > greatest_product
  start += 1
  stop += 1
end

puts greatest_product
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