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Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
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(def to-closing {\{ \} \( \) \[ \] \< \>})
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(def to-score {\) 1 \] 2 \} 3 \> 4})
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(defn check-line [input]
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(loop [in input open '()]
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(cond
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(empty? in)
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(map to-closing open)
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(and (contains? #{\} \) \] \>} (first in))
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(not= (to-closing (first open)) (first in)))
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nil
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:else
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(recur
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(rest in)
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(if (contains? #{\{ \( \[ \<} (first in))
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(conj open (first in))
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(rest open)
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)))))
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(->> (slurp "./in")
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(clojure.string/split-lines)
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(map (comp check-line vec))
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(filter some?)
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(map (partial reduce #(+ (* 5 %1) (to-score %2)) 0))
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(sort)
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(#(nth % (quot (count %) 2)))
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(println))
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