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67 lines
1.7 KiB
Clojure
67 lines
1.7 KiB
Clojure
(require '[clojure.string :as str])
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(require '[clojure.set :as set])
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(defn find-match
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"
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Searches for digit that `has segs-left` segments remaining
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after the segments of `dig-to-cmp` are removed from the
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digits in `cnts` with `grp-to-cmp` segments.
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"
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[segs-left dig-to-cmp cnts grp-to-cmp]
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(as-> cnts $
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(filterv #(= (first %) grp-to-cmp) $)
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(filterv
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#(-> (second %)
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(str/replace (re-pattern (str/join ["[" dig-to-cmp "]"])) "")
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(count)
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(= segs-left)
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)
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$
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)
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(get-in $ [0 1])
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)
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)
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(defn determine-digits [line]
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(let [counts (mapv #(do [(count %) %]) (take 10 line))
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mcounts (into {} counts)]
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(as-> {} $
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(assoc $ 1 (mcounts 2)
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4 (mcounts 4)
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7 (mcounts 3)
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8 (mcounts 7)
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)
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(assoc $ 3 (find-match 2 ($ 7) counts 5)
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6 (find-match 4 ($ 7) counts 6)
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2 (find-match 3 ($ 4) counts 5)
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9 (find-match 2 ($ 4) counts 6)
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)
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(assoc $ 5 (find-match 2 ($ 2) counts 5))
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(assoc $ 0 (find-match 2 ($ 5) counts 6))
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)
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)
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)
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(println
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(reduce
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(fn [sum input]
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(let [line (as-> input $
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(str/split $ #" ")
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(mapv (comp str/join sort) $)
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)
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number (subvec line 11 15)
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decoder (set/map-invert (determine-digits line))]
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(->> number
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(map (comp str decoder))
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(str/join)
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(#(Integer/parseInt %))
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(+ sum)
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)
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)
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)
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0
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(str/split-lines (slurp "./in"))
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)
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)
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