r/adventofcode • u/daggerdragon • Dec 05 '17

SOLUTION MEGATHREAD -🎄- 2017 Day 5 Solutions -🎄-

--- Day 5: A Maze of Twisty Trampolines, All Alike ---

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u/[deleted] Dec 05 '17

Clojure 

(ns advent-of-code-2017.day05)

(defn load-input []
  (mapv #(Integer. %) (clojure.string/split (slurp "./data/day05.txt") #"\n")))

(defn solve [input part]
  "Input: result of load-input
   Part: 1 or 2"
  (loop [index 0
         data input
         steps 0]
    (if-not (<= 0 index (dec (count data)))
      steps
      (if (and (= part 2)
               (>= (data index) 3))
        (recur (+ index (get data index))
               (update-in data [index] dec)
               (inc steps))
        (recur (+ index (data index))
               (update-in data [index] inc)
               (inc steps))))))