48 lines
1020 B
Clojure
48 lines
1020 B
Clojure
(ns day10
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(:require [mapped-area]
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[helpers :refer [get-input]]))
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(def test-map
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(mapped-area/parse-elements
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(mapped-area/read-mapped-area
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"89010123
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78121874
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87430965
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96549874
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45678903
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32019012
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01329801
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10456732")))
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(defn trailheads [a]
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(reduce
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(fn [coll [coord value]]
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(if (= value 0)
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(conj coll coord)
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coll))
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[]
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(mapped-area/mapped-area-indexed-seq a)))
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(defn step [a [x y]]
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(let [c (get-in a [x y])
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even-gradual-uphill?
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(fn [[x' y']]
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(let [c' (get-in a [x' y'])]
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(= 1 (- c' c))))]
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(->>
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[[(inc x) y] [(dec x) y]
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[x (inc y)] [x (dec y)]]
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(filter (partial mapped-area/mapped? a))
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(filter even-gradual-uphill?))))
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(defn walk [a trailhead]
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(loop [positions [trailhead]]
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(println positions)
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(if (== 9 (get-in a (first positions)))
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(count positions)
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(recur (mapcat (partial step a) (set positions))))))
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(reduce +
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(map (partial walk test-map) (trailheads test-map)))
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