#mitori_clj Project Euler Problem 11

problem_11.clj

(ns tnoda.projecteuler.problem-11
  [:require [clojure.string :as str]])

(def ^:private input "08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08
49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00
81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65
52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 36 91
22 31 16 71 51 67 63 89 41 92 36 54 22 40 40 28 66 33 13 80
24 47 32 60 99 03 45 02 44 75 33 53 78 36 84 20 35 17 12 50
32 98 81 28 64 23 67 10 26 38 40 67 59 54 70 66 18 38 64 70
67 26 20 68 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21
24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72
21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95
78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92
16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57
86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58
19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40
04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66
88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69
04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36
20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16
20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54
01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48")

(def ^:private grid {:width 20,
                     :numbers (->> (str/split input #"\s+")
                                   (map #(Long/parseLong %)))})

(defn- lines
  [w]
  (fn
    [s]
    (map #(take-nth % s) [1 (dec w) w (inc w)])))

(defn- fence
  [w nums]
  (->> (partition w nums)
       (interpose [0])
       (apply concat)))

(defn- muln
  [n]
  (fn
    [s]
    (if-let [nums (first (partition n s))]
      (apply * nums))))

(defn- solver*
  [{w :width nums :numbers}]
  (->> (fence w nums)
       (iterate next)
       (take-while seq)
       (mapcat (lines (inc w)))
       (keep (muln 4))
       (apply max)))

(def solver (partial solver* grid))

どなたか，Python にある doctest の Clojure 版をご存知の方いらっしゃいませんか? あれば使ってみたいです．

と思って探していたら with-test を見つけました．