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Problem 8

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1 parent 558b304 commit 4a1ad0ed979c5f58e5394866e2071dd94400b84d @michaelklishin committed Jun 17, 2012
Showing with 37 additions and 0 deletions.
  1. +37 −0 src/test/scala/com/novemberain/euler/Problem8Spec.scala
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37 src/test/scala/com/novemberain/euler/Problem8Spec.scala
@@ -0,0 +1,37 @@
+package com.novemberain.euler
+
+import org.specs2.mutable.Specification
+
+class Problem8Spec extends Specification {
+ "the greatest product of five consecutive digits in the given 1000-digit number" should {
+ val s = """
+ 73167176531330624919225119674426574742355349194934
+ 96983520312774506326239578318016984801869478851843
+ 85861560789112949495459501737958331952853208805511
+ 12540698747158523863050715693290963295227443043557
+ 66896648950445244523161731856403098711121722383113
+ 62229893423380308135336276614282806444486645238749
+ 30358907296290491560440772390713810515859307960866
+ 70172427121883998797908792274921901699720888093776
+ 65727333001053367881220235421809751254540594752243
+ 52584907711670556013604839586446706324415722155397
+ 53697817977846174064955149290862569321978468622482
+ 83972241375657056057490261407972968652414535100474
+ 82166370484403199890008895243450658541227588666881
+ 16427171479924442928230863465674813919123162824586
+ 17866458359124566529476545682848912883142607690042
+ 24219022671055626321111109370544217506941658960408
+ 07198403850962455444362981230987879927244284909188
+ 84580156166097919133875499200524063689912560717606
+ 05886116467109405077541002256983155200055935729725
+ 71636269561882670428252483600823257530420752963450
+ """.stripMargin.replaceAll("\n", "").replaceAll("\\s", "")
+
+ "equal 40824" in {
+ val xs = for(x <- Range(0, s.length-4)) yield s.substring(x, x+5)
+ val n = xs.map((s: String) => s.split("", 6).drop(1).map((s: String) => s.toInt)).map(_.product).max
+
+ n should_== 40824
+ }
+ }
+}

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