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do day 11

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Adam Jeniski 2023-12-11 09:45:58 -05:00
parent c48053fb3a
commit 6c967062d9
1 changed files with 53 additions and 0 deletions
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2023/src/day11.clj Normal file
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(ns day11
(:require [core :refer [get-puzzle-input]]))
(def input (get-puzzle-input 11))
(def empty-rows
(->> input
(map-indexed vector)
(filter (fn [[_ line]]
(every? #(= \. %) line)))
(map first)))
(def empty-cols
(->> input first count range
(filter (fn [n] (every? #(= \. %)
(map #(.charAt % n) input))))))
(defn gen-hash-locations [modifier]
(->> input
(map-indexed (fn [row line]
(map-indexed (fn [col c]
[[row col] c])
line)))
(apply concat)
(filter #(= \# (second %)))
(map first)
(map (fn [[row col]]
[(+ row (* (dec modifier)
(count (filter #(> row %) empty-rows))))
(+ col (* (dec modifier)
(count (filter #(> col %) empty-cols))))]))))
;; part 1
(let [locs (gen-hash-locations 2)]
(->> (into #{} (for [[x1 y1 :as a] locs
[x2 y2 :as b] locs
:when (or (not= x1 x2)
(not= y1 y2))]
(sort [a b])))
(map (fn [[[x1 y1] [x2 y2]]]
(+ (abs (- x2 x1)) (abs (- y2 y1)))))
(reduce +)))
;; part 2
(let [locs (gen-hash-locations 1000000)]
(->> (into #{} (for [[x1 y1 :as a] locs
[x2 y2 :as b] locs
:when (or (not= x1 x2)
(not= y1 y2))]
(sort [a b])))
(map (fn [[[x1 y1] [x2 y2]]]
(+ (abs (- x2 x1)) (abs (- y2 y1)))))
(reduce +)))