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(ns aoc-2022.day03)
(require '[clojure.java.io :as io])
(require '[aoc-2022.utils :refer :all])
(defn compartments [sack]
(let [n (count sack)]
[(take (/ n 2) sack)
(drop (/ n 2) sack)]))
(defn find-common [needles haystack]
(let [needle (first needles)
occurs (fn [hs] (filter #(= needle %) hs))]
(cond
(nil? needle) nil
(seq(occurs haystack)) needle
:else (find-common (rest needles) haystack))))
(defn priority-of [item]
(cond
(<= (int item) (int \Z)) (+ 27 (- (int item) (int \A)))
:else (+ 1 (- (int item) (int \a)))))
(defn task1 [rows]
(->> rows
(map compartments)
(map (fn [[c1 c2]] (find-common c1 c2)))
(map priority-of)
(reduce +)
))
(defn find-common2 [needles hs1 hs2]
(let [needle (first needles)
occurs (fn [hs] (filter #(= needle %) hs))]
(cond
(nil? needle)
nil
(and
(seq (occurs hs1))
(seq (occurs hs2)))
needle
:else
(find-common2 (rest needles) hs1 hs2))))
(defn task2 [rows]
(->> rows
(partition 3)
(map (fn [[c1 c2 c3]] (find-common2 c1 c2 c3)))
(map priority-of)
(reduce +)))
(with-open [rdr (io/reader "resources/day03_actual.txt")]
(let [rows (line-seq rdr)]
(println "task1:" (task1 rows))
(println "task2:" (task2 rows))))
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