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(def cards
(->> (clojure.string/split (slurp "day22") #"\n\n")
(map clojure.string/split-lines)
(map rest)
(map (partial map read-string))))
(defn combat [[t1 & r1 :as p1] [t2 & r2 :as p2]]
(cond
(nil? t1) p2
(nil? t2) p1
:else
(if (> t1 t2)
(recur (concat r1 [t1 t2]) r2)
(recur r1 (concat r2 [t2 t1])))))
(defn score [cards]
(->> cards
reverse
(cons 0)
(map-indexed vector)
(map (partial apply *))
(apply +)))
(score (apply combat cards))
;; => 33421
(defn recursive-combat [log [t1 & r1 :as p1] [t2 & r2 :as p2]]
(if (log [p1 p2])
[p1 []]
(if (or (empty? p1) (empty? p2))
[p1 p2]
(let [log (conj log [p1 p2])]
(if (and (< t1 (count p1)) (< t2 (count p2)))
(let [[o1 o2] (recursive-combat #{} (take t1 r1) (take t2 r2))]
(if (empty? o2)
(recur log (concat r1 [t1 t2]) r2)
(recur log r1 (concat r2 [t2 t1]))))
(if (> t1 t2)
(recur log (concat r1 [t1 t2]) r2)
(recur log r1 (concat r2 [t2 t1]))))))))
(->> (apply recursive-combat #{} cards)
flatten
(remove nil?)
score)
;; => 33651, quite slow
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