Created
November 13, 2019 18:17
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| (ns adventofcode.playground.d4 | |
| (:require [clojure.string :as s])) | |
| (defn line->date+event [line] | |
| (let [[_ date-string event-string] (s/split line #"\[(.*?)\]")] | |
| {:date (.getTime (doto (new js/Date date-string) | |
| (.setSeconds 0) | |
| (.setMilliseconds 0))) | |
| :event (case (s/trim event-string) | |
| "wakes up" :wakeup | |
| "falls asleep" :sleep | |
| ;; otherwise just blindly assume its a new shift :D | |
| (re-find #"\d+" event-string))})) | |
| (defn str->shifts-log [text] | |
| (let [shift-change? (fn [{e :event}] (contains? #{:sleep :wakeup} e))] | |
| (->> (s/split-lines text) | |
| (map s/trim) | |
| (remove empty?) | |
| (map line->date+event) | |
| (sort-by :date) | |
| (partition-by shift-change?) | |
| (partition 2) | |
| (map flatten)))) | |
| (defn shifts-log->guards-log [log] | |
| (-> (fn [guards-log [{guard :event} & shift]] | |
| (update guards-log guard concat shift)) | |
| (reduce {} log))) | |
| (defn solve [input] | |
| (let [guards-log (->> input | |
| (str->shifts-log) | |
| (shifts-log->guards-log)) | |
| [guard sleepy-ms] (->> guards-log | |
| (map | |
| (fn [[id shift]] | |
| [id (->> shift | |
| (map :date) | |
| (partition 2) | |
| (map reverse) | |
| (map (partial apply -)) | |
| (reduce +))])) | |
| (sort-by second) | |
| (last)) | |
| [m _] (->> (guards-log guard) | |
| (map :date) | |
| (partition 2) | |
| (mapcat (fn [[a b]] | |
| (let [start (.getMinutes (new js/Date a)) | |
| end (+ start (/ (- b a) (* 1000 60)))] | |
| (range start end)))) | |
| (frequencies) | |
| (sort-by second) | |
| (last))] | |
| (* guard m))) | |
| (comment | |
| (println | |
| (solve | |
| " | |
| [1518-11-01 00:00] Guard #10 begins shift | |
| [1518-11-01 00:05] falls asleep | |
| [1518-11-01 00:25] wakes up | |
| [1518-11-01 00:30] falls asleep | |
| [1518-11-01 00:55] wakes up | |
| [1518-11-01 23:58] Guard #99 begins shift | |
| [1518-11-02 00:40] falls asleep | |
| [1518-11-02 00:50] wakes up | |
| [1518-11-03 00:05] Guard #10 begins shift | |
| [1518-11-03 00:24] falls asleep | |
| [1518-11-03 00:29] wakes up | |
| [1518-11-04 00:02] Guard #99 begins shift | |
| [1518-11-04 00:36] falls asleep | |
| [1518-11-04 00:46] wakes up | |
| [1518-11-05 00:03] Guard #99 begins shift | |
| [1518-11-05 00:45] falls asleep | |
| [1518-11-05 00:55] wakes up"))) |
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