22 lines
943 B
Clojure
22 lines
943 B
Clojure
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(require '[clojure.string :as str])
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(def filename "day2-input")
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(def move-pairs (map #(str/split % #" ") (str/split-lines (slurp filename))))
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(def move-map {"A" 1 "B" 2 "C" 3 "X" 1 "Y" 2 "Z" 3})
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(defn draw-win-lose-score [our-move their-move]
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(get [3 6 0] (mod (- our-move their-move) 3)))
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(defn part-1-round-score
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[move-pair]
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(let [[opposing-move our-move] move-pair]
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(def op (get move-map opposing-move))
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(def us (get move-map our-move))
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(+ (draw-win-lose-score us op) us)))
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(println (reduce + (map part-1-round-score move-pairs))) ; Part 1
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(defn part-2-round-score
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[move-pair]
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(let [[opposing-move our-move] move-pair]
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(def op (get move-map opposing-move))
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(def us-move-offset (- (get move-map our-move) 2))
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(def us (+ (mod (+ (- op 1) us-move-offset) 3) 1))
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(+ (draw-win-lose-score us op) us)))
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(println (reduce + (map part-2-round-score move-pairs))) ; Part 2
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