34 lines
934 B
Clojure
34 lines
934 B
Clojure
(require '[clojure.string :as str])
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(require '[clojure.set])
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(require '[clojure.zip :as zip])
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(def elves (str/split-lines (slurp "input/3")))
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(defn priority [char]
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(let [
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c (int char)
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a (int \a)
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z (int \z)
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A (int \A)
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]
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(if (<= a c z)
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(+ (- c a) 1)
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(+ (- c A) 27))))
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; Part 1
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(defn two-knapsacks [line] (
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let [
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half (/ (count line) 2)
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[knapsack-1 knapsack-2] (map set (split-at half line))
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]
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(priority (first (clojure.set/intersection knapsack-1 knapsack-2)
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))))
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(println (reduce + (map two-knapsacks elves)))
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; Part 2
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(defn chunker [sequence num]
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(if (<= (count sequence) num)
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[sequence]
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(let [[head tail] (split-at num sequence)] (lazy-seq (cons head (chunker tail num))))))
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(defn three-elves [lines]
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(priority (first (apply clojure.set/intersection (map set lines)))))
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(println (reduce + (map three-elves (chunker elves 3)))) |