day10

3 files changed, 126 insertions, 0 deletions

diff --git a/day10 b/day10
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diff --git a/day10.clj b/day10.clj
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+++ b/day10.clj
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+(def data
+  (->> (slurp "day10")
+       (clojure.string/split-lines)
+       (map read-string)
+       vec))
+
+(def diff
+  (->> data
+       (#(cons 0 %))
+       (#(cons (+ 3 (reduce max %)) %))
+       sort
+       (#(map - (rest %) %))))
+
+(->> diff
+     frequencies
+     (#(map % [1 3]))
+     (apply *)) ; => 1820
+
+(->> diff
+     (partition-by identity)
+     (filter #(= (first %) 1))
+     (map count)
+     (map #(inc (* (dec %) (/ % 2))))   ; http://oeis.org/A000124
+     (apply *)) ; => 3454189699072N
+
+;; => (1 3 1 1 1 3 1 1 3 1 3 3)
+;;      1     4      2    1
+;;
+;; => (1 1 1 1 3 1 1 1 1 3 3 1 1 1 3 1 1 3 3 1 1 1 1 3 1 3 3 1 1 1 1 3)
+;;        7         7          4      2         7      1        7
+;; 19208: 2 2 2 7 7 7 7
diff --git a/day10.ijs b/day10.ijs
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+++ b/day10.ijs
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+d=:|2-/\3,0x,/:~".;._2(1!:1)<'day10'
+*/#/.~d
+*/>:(<:*-:)@#;._1 d