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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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