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day_12.clj
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day_12.clj
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(require '[clojure.string :as string])
(def pattern #"(\w+) (\w+) ?([\w-]+)?")
(def input
(->> (slurp "day_12_input.txt")
(string/split-lines)
(map #(rest (re-find pattern %)))
(vec)))
(defn get-value [key-or-value state]
(if (contains? #{"a" "b" "c" "d"} key-or-value)
(get state key-or-value)
(Integer. key-or-value)))
(defn shift-idx [commands idx state]
(let [[command p1 p2] (commands idx)]
(if (= command "jnz")
(if (= 0 (get-value p1 state))
(+ 1 idx)
(+ (Integer. p2) idx))
(+ 1 idx))))
(defn update-state [commands idx state]
(let [[command p1 p2] (commands idx)]
(case command
"jnz" state
"inc" (update state p1 #(+ % 1))
"dec" (update state p1 #(- % 1))
"cpy" (assoc state p2 (get-value p1 state)))))
(defn run-commands [commands idx state]
(loop [idx idx
state state]
(if (contains? commands idx)
(recur (shift-idx commands idx state)
(update-state commands idx state))
(get state "a"))))
(run-commands input 0 {"a" 0, "b" 0, "c" 0, "d" 0})
(run-commands input 0 {"a" 0, "b" 0, "c" 1, "d" 0})