mirror of
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91 lines
3.0 KiB
Clojure
91 lines
3.0 KiB
Clojure
(ns day23
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(:require
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[clojure.string :as str]
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[lonocloud.synthread.macros :refer :all]
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[core :refer [get-puzzle-input]]))
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; (def input (get-puzzle-input 23))
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(def input (str/split-lines "#.#####################
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#.......#########...###
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#######.#########.#.###
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###.....#.>.>.###.#.###
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###v#####.#v#.###.#.###
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###.>...#.#.#.....#...#
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###v###.#.#.#########.#
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###...#.#.#.......#...#
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#####.#.#.#######.#.###
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#.....#.#.#.......#...#
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#.#####.#.#.#########v#
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#.#...#...#...###...>.#
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#.#.#v#######v###.###v#
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#...#.>.#...>.>.#.###.#
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#####v#.#.###v#.#.###.#
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#.....#...#...#.#.#...#
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#.#########.###.#.#.###
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#...###...#...#...#.###
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###.###.#.###v#####v###
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#...#...#.#.>.>.#.>.###
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#.###.###.#.###.#.#v###
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#.....###...###...#...#
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#####################.#"))
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(def start [0 1])
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(def end [(dec (count input))
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(- (count (last input)) 2)])
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(def char-map (->> input
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(map-indexed (fn [row line]
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(map-indexed (fn [col c]
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[[row col] c])
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line)))
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(apply concat)
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(into {})))
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(def offsets [[0 1] [0 -1] [1 0] [-1 0]])
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;; part 1
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(->> (loop [q [{:loc start, :visited #{}}]
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ans #{}]
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(if (empty? q)
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ans
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(let [[{:keys [loc visited]}] q
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visited' (conj visited loc)
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[x y] loc]
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(if (= end loc)
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(recur (rest q) (conj ans (count visited)))
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(recur (concat (rest q)
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(-> []
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(>for [o offsets]
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(>let [[x' y' :as loc'] (mapv + loc o)]
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(>when (and (not (visited loc'))
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(or (= \. (char-map loc'))
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(and (= \> (char-map loc')) (< y y'))
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(and (= \< (char-map loc')) (> y y'))
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(and (= \v (char-map loc')) (< x x'))
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(and (= \^ (char-map loc')) (> x x'))))
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(conj loc'))))
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(>each (#(hash-map :loc % :visited visited')))))
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ans)))))
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(apply max))
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;; part 2
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(->> (loop [q [{:loc start, :visited #{}}]
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ans #{}]
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(if (empty? q)
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ans
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(let [[{:keys [loc visited]}] q
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visited' (conj visited loc)]
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(if (= end loc)
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(recur (rest q) (conj ans (count visited)))
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(recur (concat (rest q)
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(-> []
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(>for [o offsets]
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(>let [[x' y' :as loc'] (mapv + loc o)]
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(>when (and (not (visited loc'))
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(#{ \. \> \< \v \^} (char-map loc')))
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(conj loc'))))
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(>each (#(hash-map :loc % :visited visited')))))
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ans)))))
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(apply max))
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