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Day 2, Day 3, and a helper, add ASCII art day headings

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Joseph Ferano 2025-12-07 20:12:24 +07:00
parent 527b1d41ea
commit 2246504b1a
1 changed files with 112 additions and 0 deletions
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2025.clj
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@ -3,6 +3,22 @@
(defn get-input [day] (slurp (str "2025/day" day "-input.txt"))) (defn get-input [day] (slurp (str "2025/day" day "-input.txt")))
(defn remove-index
"Removes an item at the specified position in a vector"
[coll ^long index]
(-> (into (subvec coll 0 index)
(subvec coll (inc index)))
(with-meta (meta coll))))
;; _____ __
;; | __ \ /_ |
;; | | | | __ _ _ _ | |
;; | | | |/ _` | | | | | |
;; | |__| | (_| | |_| | | |
;; |_____/ \__,_|\__, | |_|
;; __/ |
;; |___/
(def day1-input-test (def day1-input-test
"L68 "L68
L30 L30
@ -50,3 +66,99 @@ L82")
(day1-p2 day1-input-test) (day1-p2 day1-input-test)
(day1-p2 (get-input 1)) (day1-p2 (get-input 1))
:-) :-)
;; _____ ___
;; | __ \ |__ \
;; | | | | __ _ _ _ ) |
;; | | | |/ _` | | | | / /
;; | |__| | (_| | |_| | / /_
;; |_____/ \__,_|\__, | |____|
;; __/ |
;; |___/
(def day2-input-test
"11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124")
(defn day2-parse-input [input]
(->> (str/split (str/trim input) #",")
(map #(str/split % #"-"))
(map #(mapv parse-long %))
(map (fn [[lo hi]] (range lo (inc hi))))
flatten))
(defn day2-p1 [input]
(->> input
(keep #(let [num-str (str %)
length (count num-str)
half (/ length 2)]
(when (and (even? length)
(= (subs num-str 0 half)
(subs num-str half length)))
%)))
(reduce +)))
(defn day2-p2 [input]
(->> input
(keep #(let [num-str (str %)
length (count num-str)]
(loop [p-size (quot length 2)]
(cond
(zero? p-size)
nil
(apply = (partition-all p-size num-str))
%
:else
(recur (dec p-size))))))
(reduce +)))
(comment
(day2-p1 (day2-parse-input day2-input-test))
(day2-p1 (day2-parse-input (get-input 2)))
(day2-p2 (day2-parse-input day2-input-test))
(day2-p2 (day2-parse-input (get-input 2)))
:-)
;; _____ ____
;; | __ \ |___ \
;; | | | | __ _ _ _ __) |
;; | | | |/ _` | | | | |__ <
;; | |__| | (_| | |_| | ___) |
;; |_____/ \__,_|\__, | |____/
;; __/ |
;; |___/
(def day3-input-test
"987654321111111
811111111111119
234234234234278
818181911112111")
(defn day3-get-max-battery [total-digits bank]
(loop [remaining (dec total-digits)
curr-idx 0
nums []]
(if (= (count nums) total-digits)
(reduce (fn [acc digit] (+ (* acc 10) digit)) 0 nums)
(let [subbank (subvec bank curr-idx (- (count bank) remaining))
[idx max-num] (->> (map-indexed vector subbank)
(reduce (fn [[idx max] [i n]]
(if (> n max)
[i n]
[idx max]))
[-1 -1]))]
(recur (dec remaining) (+ curr-idx idx 1) (conj nums max-num))))))
(defn day3 [total-digits input]
(->> (str/split-lines input)
(mapv #(mapv (fn [c] (Character/digit c 10)) (vec %)))
(map (partial day3-get-max-battery total-digits))
taptap
(reduce +)))
(comment
(day3 2 day3-input-test)
(day3 2 (get-input 3))
(day3 12 day3-input-test)
(day3 12 (get-input 3))
:-)