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Clojure中可以實現(xiàn)和優(yōu)化搜索算法,以下是一些常見的搜索算法及其在Clojure中的實現(xiàn)和優(yōu)化方法:
first
和rest
函數(shù)來遍歷列表進行線性搜索。為了優(yōu)化線性搜索算法,可以考慮使用Clojure中的filter
函數(shù)進行篩選,以減少搜索時間。(defn linear-search [target coll]
(some #(when (= target %) %) coll))
(defn optimized-linear-search [target coll]
(first (filter #(= target %) coll)))
binary-search
函數(shù)對有序列表進行二分搜索。為了優(yōu)化二分搜索算法,可以考慮使用Clojure中的subvec
函數(shù)來減少搜索范圍。(defn binary-search [target coll]
(let [low 0
high (dec (count coll))]
(loop [l low
h high]
(if (<= l h)
(let [mid (quot (+ l h) 2)]
(cond
(= target (nth coll mid)) mid
(< target (nth coll mid)) (recur l (dec mid))
:else (recur (inc mid) h)))
-1))))
(defn optimized-binary-search [target coll]
(let [low 0
high (dec (count coll))]
(loop [l low
h high]
(if (<= l h)
(let [mid (quot (+ l h) 2)
mid-elem (nth coll mid)]
(cond
(= target mid-elem) mid
(< target mid-elem) (recur l (dec mid))
:else (recur (inc mid) h)))
-1)))
persistent-queue
庫來實現(xiàn)隊列,以提高效率。(require '[clojure.data.priority-map :as pq])
(defn bfs [start-goal-graph start-node goal-node]
(loop [queue (pq/priority-map start-node 0)
visited #{}
parents {}
current-node nil]
(if (empty? queue)
nil
(let [[current-node current-cost] (pq/peek queue)
neighbors (get start-goal-graph current-node)]
(if (= current-node goal-node)
(reverse (cons current-node (take-while identity (iterate #(get parents %) current-node))))
(recur (reduce #(if (contains? visited %2) %1 %2) (dissoc queue current-node) neighbors)
(conj visited current-node)
(reduce #(assoc %1 %2 current-node) parents neighbors)
current-node)))))
(defn optimized-bfs [start-goal-graph start-node goal-node]
(loop [queue (pq/priority-map start-node 0)
visited #{}
parents {}
current-node nil]
(if (empty? queue)
nil
(let [[current-node current-cost] (pq/peek queue)
neighbors (get start-goal-graph current-node)]
(if (= current-node goal-node)
(reverse (cons current-node (take-while identity (iterate #(get parents %) current-node))))
(recur (reduce #(if (contains? visited %2) %1 %2) (dissoc queue current-node) neighbors)
(conj visited current-node)
(reduce #(assoc %1 %2 current-node) parents neighbors)
current-node)))))
以上是一些常見的搜索算法及其在Clojure中的實現(xiàn)和優(yōu)化方法。通過合理地利用Clojure的函數(shù)式編程特性和高階函數(shù),可以更加簡潔和高效地實現(xiàn)和優(yōu)化搜索算法。
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