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(def to-closing {\{ \} \( \) \[ \] \< \>})
(def to-score {\) 1 \] 2 \} 3 \> 4})
(defn check-line [input]
(loop [in input open '()]
(cond
(empty? in)
(map to-closing open)
(and (contains? #{\} \) \] \>} (first in))
(not= (to-closing (first open)) (first in)))
nil
:else
(recur
(rest in)
(if (contains? #{\{ \( \[ \<} (first in))
(conj open (first in))
(rest open)
)))))
(->> (slurp "./in")
(clojure.string/split-lines)
(map (comp check-line vec))
(filter some?)
(map (partial reduce #(+ (* 5 %1) (to-score %2)) 0))
(sort)
(#(nth % (quot (count %) 2)))
(println))
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