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;;;; Last modified: 2014-01-04 23:01:02 tkych | |
;;==================================================================== | |
;; 積み木の水槽 | |
;;==================================================================== | |
;; - [積み木の水槽 〜 横へな 2013.9.6](http://nabetani.sakura.ne.jp/hena/ord13blocktup/) | |
;; - [第13回オフラインリアルタイムどう書くの問題](http://qiita.com/Nabetani/items/936e7885f4c607472060) | |
;;-------------------------------------------------------------------- | |
;; Package | |
;;-------------------------------------------------------------------- | |
(in-package :cl-user) | |
(eval-when (:compile-toplevel :load-toplevel :execute) | |
(ql:quickload :split-sequence)) | |
(defpackage :block-water-tank | |
(:use :cl) | |
(:import-from :split-sequence :split-sequence)) | |
(in-package :block-water-tank) | |
;;-------------------------------------------------------------------- | |
;; Main | |
;;-------------------------------------------------------------------- | |
;; "83141310145" -> ((8 3 1 4 1 3 1) (1 4 5)) | |
(defun parse (input) | |
(split-sequence 0 (map 'list #'digit-char-p input))) | |
;; (8 3 1 4 1 3 1) -> 6 | |
(defun count-water (tank) | |
(labels | |
((rec (tank count) | |
(if (null (cddr tank)) | |
count | |
(destructuring-bind (left . rest) tank | |
(rec rest | |
(+ count | |
(loop :for top :downfrom left :above (first rest) | |
:when (position top rest :test #'<=) | |
:collect it :into acc | |
:finally (return (reduce #'+ acc))))))))) | |
(rec tank 0))) | |
(defun main (input) | |
(loop :for tank :in (parse input) | |
:collect (count-water tank) :into acc | |
:finally (return (write-to-string (reduce #'+ acc))))) | |
;;-------------------------------------------------------------------- | |
;; Tests | |
;;-------------------------------------------------------------------- | |
(defun =>? (got expected) | |
(assert (string= got expected))) | |
(progn | |
(=>? (main "83141310145169154671122") "24") | |
(=>? (main "923111128") "45") | |
(=>? (main "923101128") "1") | |
(=>? (main "903111128") "9") | |
(=>? (main "3") "0") | |
(=>? (main "31") "0") | |
(=>? (main "412") "1") | |
(=>? (main "3124") "3") | |
(=>? (main "11111") "0") | |
(=>? (main "222111") "0") | |
(=>? (main "335544") "0") | |
(=>? (main "1223455321") "0") | |
(=>? (main "000") "0") | |
(=>? (main "000100020003121") "1") | |
(=>? (main "1213141516171819181716151413121") "56") | |
(=>? (main "712131415161718191817161514131216") "117") | |
(=>? (main "712131405161718191817161514031216") "64") | |
(=>? (main "03205301204342100") "1") | |
(=>? (main "0912830485711120342") "18") | |
(=>? (main "1113241120998943327631001") "20") | |
(=>? (main "7688167781598943035023813337019904732") "41") | |
(=>? (main "2032075902729233234129146823006063388") "79") | |
(=>? (main "8323636570846582397534533") "44") | |
(=>? (main "2142555257761672319599209190604843") "41") | |
(=>? (main "06424633785085474133925235") "51") | |
(=>? (main "503144400846933212134") "21") | |
(=>? (main "1204706243676306476295999864") "21") | |
(=>? (main "050527640248767717738306306596466224") "29") | |
(=>? (main "5926294098216193922825") "65") | |
(=>? (main "655589141599534035") "29") | |
(=>? (main "7411279689677738") "34") | |
(=>? (main "268131111165754619136819109839402") "102") | |
) | |
;;==================================================================== |
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