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solve problem 8

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xadn committed Jul 6, 2014
1 parent 87dd1dc commit 3e95a8ea76b29d6a73124ac8a3bf65b46f77f232
Showing with 42 additions and 2 deletions.
  1. +17 −2 src/eulercl/core.clj
  2. +25 −0 test/eulercl/core_test.clj
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@@ -76,8 +76,23 @@
(defn problem-6
([] (problem-6 (range 1 101)))
- ([r] (- (square-of-sums r) (sum-of-squares r)))
- )
+ ([r] (- (square-of-sums r) (sum-of-squares r))))
+
+(defn sanitize-block-of-numbers [text]
+ (map (comp read-string str)
+ (clojure.string/replace text #"\s" "")))
+
+(defn slice-vec [my-vector len start]
+ (subvec my-vector start (+ start len)))
+
+(defn problem-7 [text numAdjacent]
+ (let [nums (vec (sanitize-block-of-numbers text))
+ endPos (- (count nums) numAdjacent)
+ sliceStarts (range 0 (+ 1 endPos))]
+ (apply max
+ (map (comp (partial reduce *)
+ (partial slice-vec nums numAdjacent))
+ sliceStarts))))
(defn -main
[& args]
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@@ -26,3 +26,28 @@
(is (= (problem-6 (range 1 11)) 2640))
(is (= (problem-6) 25164150)))
+
+(deftest problem-7-test
+ (let [text "73167176531330624919225119674426574742355349194934
+ 96983520312774506326239578318016984801869478851843
+ 85861560789112949495459501737958331952853208805511
+ 12540698747158523863050715693290963295227443043557
+ 66896648950445244523161731856403098711121722383113
+ 62229893423380308135336276614282806444486645238749
+ 30358907296290491560440772390713810515859307960866
+ 70172427121883998797908792274921901699720888093776
+ 65727333001053367881220235421809751254540594752243
+ 52584907711670556013604839586446706324415722155397
+ 53697817977846174064955149290862569321978468622482
+ 83972241375657056057490261407972968652414535100474
+ 82166370484403199890008895243450658541227588666881
+ 16427171479924442928230863465674813919123162824586
+ 17866458359124566529476545682848912883142607690042
+ 24219022671055626321111109370544217506941658960408
+ 07198403850962455444362981230987879927244284909188
+ 84580156166097919133875499200524063689912560717606
+ 05886116467109405077541002256983155200055935729725
+ 71636269561882670428252483600823257530420752963450"]
+ (is (= (problem-7 text 4) 5832))
+ (is (= (problem-7 text 13) 23514624000))))
+

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