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(defn parse [s]
(into {} (map #(vec (drop 1 %)) (re-seq #"(\w+):(\S+)" s))))
(def data
(map parse (clojure.string/split (slurp "day04") #"\n\n")))
(defn valid-keys? [r]
(empty? (clojure.set/difference
#{"byr" "iyr" "eyr" "hgt" "hcl" "ecl" "pid"}
(set (keys r)))))
(defn valid-height? [s]
(if-let [[_ n u] (re-matches #"([0-9]+)(cm|in)" s)]
(or (and (= u "cm") (<= 150 (Integer/parseInt n) 193))
(and (= u "in") (<= 59 (Integer/parseInt n) 76)))
false))
(defn valid? [r]
(and (valid-keys? r)
(<= 1920 (Integer/parseInt (r "byr")) 2002)
(<= 2010 (Integer/parseInt (r "iyr")) 2020)
(<= 2020 (Integer/parseInt (r "eyr")) 2030)
(valid-height? (r "hgt"))
(re-matches #"#[0-9a-f]{6}" (r "hcl"))
(#{"amb" "blu" "brn" "gry" "grn" "hzl" "oth"} (r "ecl"))
(re-matches #"[0-9]{9}" (r "pid"))))
(->> data
(filter valid-keys?)
(count)) ; => 228
(->> data
(filter valid?)
(count)) ; => 175
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