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part 2

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This commit is contained in:
Adam Jeniski 2025-01-13 00:16:02 -05:00
parent e575898b7a
commit 0327924c7a
1 changed files with 47 additions and 5 deletions
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52
2024/src/day12.clj
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@ -4,7 +4,8 @@
[core :as c]
[input-manager :refer [get-input]]))
(def input (c/map-by-coords (get-input 12)))
(def input (c/map-by-coords
(get-input 2024 12)))
(def cardinal-offsets [[0 1] [0 -1] [1 0] [-1 0]])
(defn steps [loc]
@ -36,15 +37,56 @@
(map #(count (second %)))
(reduce +)))
(defn get-ans [get-perimeter-value]
(defn get-ans [f]
(loop [acc 0
[loc & to-see] (set (keys input))]
[loc & to-see]
(set (keys input))
; #{[0 0]}
]
(if (nil? loc)
acc
(let [shape (get-shape loc)]
(let [shape (get-shape loc)
value (f shape)]
(recur (+ acc (* (count shape)
(get-perimeter-value shape)))
value))
(s/difference (set to-see) (set shape)))))))
;; part 1
(get-ans get-perimeter-count)
(defn corner-triples [[row col]]
(let [[top top-right right bottom-right bottom bottom-left left top-left]
[[(dec row) col]
[(dec row) (inc col)]
[row (inc col)]
[(inc row) (inc col)]
[(inc row) col]
[(inc row) (dec col)]
[row (dec col)]
[(dec row) (dec col)]]]
[[left top-left top]
[top top-right right]
[right bottom-right bottom]
[bottom bottom-left left]]))
(defn corner-count [pos shape]
(->> pos
corner-triples
(c/mmap #(contains? shape %))
(filter #{[true false true] ;;inner
[false true false] ;;outer
[false false false]}) ;;outer
count))
(defn inner-corner? [pos shape]
(seq (->> pos
corner-triples
(c/mmap #(contains? shape %))
)))
(defn get-num-corners [shape]
(reduce + (map #(corner-count % shape)
shape)))
;; part 2
(get-ans get-num-corners)