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This commit is contained in:
Adam Jeniski 2023-12-03 13:46:54 -05:00
parent 34a17e5edb
commit 656d8bb725
1 changed files with 18 additions and 18 deletions
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30
2023/src/day03.clj
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@ -24,32 +24,33 @@
matches)))
(mapcat identity)))
(defn coords-to-check [row col num-str]
(for [r [(dec row) row (inc row)]
c (range (dec col) (+ col (count num-str) 1))]
[r c]))
;; part 1
(->> (parse-nums lines)
(filter (fn touches-symbol? [[row-idx col-idx s]]
(let [length (count s)]
(->> (for [r [(dec row-idx) row-idx (inc row-idx)]
c (range (dec col-idx) (+ col-idx length 1))]
(char-map [r c]))
(filter (fn touches-symbol? [[row col s]]
(->> (coords-to-check row col s)
(map char-map)
(filter (comp not nil?))
(some #(not (or (Character/isDigit %) (= % \.))))))))
(some #(not (or (Character/isDigit %) (= % \.)))))))
(map #(Integer/parseInt (nth % 2)))
(reduce +))
;; stars is a list of [[star-row-idx star-col-idx] "num"]
;; stars is list of each * char found touching a number when iterating by nums
(def stars (->> (parse-nums lines)
(map (fn touching-stars [[row-idx col-idx s]]
(let [length (count s)]
(->> (for [r [(dec row-idx) row-idx (inc row-idx)]
c (range (dec col-idx) (+ col-idx length 1))]
[[r c] (char-map [r c])])
(map (fn touching-stars [[row col s]]
(->> (coords-to-check row col s)
(map #(vector % (char-map %)))
(filter #(not (nil? (second %))))
(filter #(= \* (second %)))
(map #(vector % s))))))
(map #(vector % s)))))
(filter seq)
(mapcat identity)
(map #(vector (ffirst %) (second %)))))
(map (fn [[[coords] num]] [coords num]))))
;; gears is a set of [star-row-idx star-col-idx]
;; gears is a list of each * char that is touching exactly 2 nums
@ -67,6 +68,5 @@
(map #(second (update % 1 (partial map second))))
(map (partial map #(Integer/parseInt %)))
(map (partial reduce *))
(reduce +)
)
(reduce +))