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init day 6

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Adam Jeniski 2024-12-06 09:33:17 -05:00
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(ns day06
(:require [input-manager :refer [get-input]]
[core :as c]))
(def input (mapv vec (get-input 6)))
(defn get-char [[row col]]
(get (get input row) col))
(def start (->> (c/get-coords input)
(filter #(= \^ (get-char %)))
first))
(def num-cols (count (first input)))
(def num-rows (count input))
(defn move [dir [row col]]
(condp = dir
:up [(dec row) col]
:down [(inc row) col]
:left [row (dec col)]
:right [row (inc col)]))
(defn turn-right [dir]
(condp = dir
:up :right
:right :down
:down :left
:left :up))
(defn in-bounds? [[row col]]
(and (>= row 0) (>= col 0) (< row num-rows) (< col num-cols)))
(defn get-path []
(loop [pos start
dir :up
path #{}]
(if (not (in-bounds? pos))
path
(if (path [dir pos])
:cycle
(let [pos' (move dir pos)]
(if (= (get-char pos') \#)
(recur pos (turn-right dir) (conj path [dir pos]))
(recur pos'
dir
(conj path [dir pos]))))))))
(defn add-obstacle [[row col]]
(update input row assoc col \#))
;; part 1
(->> (get-path)
(map second)
distinct
count)
;; part 2
(->> (for [pos (->> (get-path)
(map second)
distinct
(filter #(not= % start)))]
(with-redefs [input (add-obstacle pos)] (get-path)))
(filter #(= % :cycle))
count)