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A very crude solution to problem number 8. Need to study the Array & …

…Enumerable class to refactor this more.
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Ashish Dixit
Ashish Dixit committed Jul 16, 2010
1 parent 3067cd4 commit 41d8616928ee407feed884da8f4f00975b625e83
Showing with 45 additions and 0 deletions.
  1. +45 −0 8_greatest_n_consecutive_product.rb
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+# Project Euler
+# Problem 8
+#
+# Description: Find the greatest product of five consecutive digits
+# in the 1000-digit number.
+#
+# 73167176531330624919225119674426574742355349194934
+# 96983520312774506326239578318016984801869478851843
+# 85861560789112949495459501737958331952853208805511
+# 12540698747158523863050715693290963295227443043557
+# 66896648950445244523161731856403098711121722383113
+# 62229893423380308135336276614282806444486645238749
+# 30358907296290491560440772390713810515859307960866
+# 70172427121883998797908792274921901699720888093776
+# 65727333001053367881220235421809751254540594752243
+# 52584907711670556013604839586446706324415722155397
+# 53697817977846174064955149290862569321978468622482
+# 83972241375657056057490261407972968652414535100474
+# 82166370484403199890008895243450658541227588666881
+# 16427171479924442928230863465674813919123162824586
+# 17866458359124566529476545682848912883142607690042
+# 24219022671055626321111109370544217506941658960408
+# 07198403850962455444362981230987879927244284909188
+# 84580156166097919133875499200524063689912560717606
+# 05886116467109405077541002256983155200055935729725
+# 71636269561882670428252483600823257530420752963450
+#
+# URL: http://projecteuler.net/index.php?section=problems&id=8
+
+def greatest_n_consecutive_product(number, n)
+ i = 0
+ max = 0
+ digits = number.split(//).map(&:to_i)
+
+ while i < digits.size - 5
+ product = (digits[i].to_i)*(digits[i+1].to_i)*(digits[i+2].to_i)*(digits[i+3].to_i)*(digits[i+4].to_i)
+ max = product if product > max
+ i = i+1
+ end
+ max
+end
+
+number = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450"
+
+puts "The greatest 5 consecutive digit product for the given number is #{greatest_n_consecutive_product(number, 5)}"

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