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Solution to Nubank's collision exercise, in Clojure
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| (ns collisions.core | |
| (:require [clojure.string :as str]) | |
| (:gen-class)) | |
| (defn str->edge [s] | |
| (->> (str/split s #" ") | |
| (map #(Integer/parseInt %)))) | |
| (defn file-contents->edges [s] | |
| (->> (str/split s #"\n") | |
| (map str->edge))) | |
| (defn edge->adj-list [[u v]] | |
| {u #{v}, v #{u}}) | |
| (defn with-new-connections [adj-list new-connections] | |
| (merge-with into adj-list new-connections)) | |
| (defn with-new-edge [adj-list edge] | |
| (->> (edge->adj-list edge) | |
| (with-new-connections adj-list))) | |
| (defn edges->adj-list [edges] | |
| (reduce with-new-edge {} edges)) | |
| (defn same-network? [a b adj-list] | |
| (loop [[curr & rest] (list a), visited? #{}] | |
| (when curr | |
| (or (= curr b) | |
| (recur (->> (adj-list curr) | |
| (filter (complement visited?)) | |
| (into rest)) | |
| (conj visited? curr)))))) | |
| (defn -main | |
| [file-path a b] | |
| (if (-> (slurp file-path) | |
| file-contents->edges | |
| edges->adj-list | |
| (->> (same-network? (Integer/parseInt a) (Integer/parseInt b)))) | |
| (println "yup") | |
| (println "nah"))) |
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