Dzakub/advent-of-code - Change Y252WSYR7C5GNY7T5F24CMOFKSMKT2JX542CBP7FPN4EAI7RMZ2QC

Day 9

Created by Dzakub on December 9, 2022

Y252WSYR7C5GNY7T5F24CMOFKSMKT2JX542CBP7FPN4EAI7RMZ2QC

Dependencies

In channels

main

Change contents

File addition: test (d--x------)
[3.1]
File addition: edition2022 (d--x------)
[0.16]

File addition: day9_test.clj (---x------)

[0.41]

(ns edition2022.day9-test
  (:require [clojure.test :refer :all]
            [edition2022.day9 :refer :all]))
(deftest rope-movement
  (testing "vertical movement"
    (is (=
          (move-rope [[0 0] [0 0]] [0 1])
          [[0 1] [0 0]]))
    (is (=
          (move-rope [[0 1] [0 0]] [0 1])
          [[0 2] [0 1]]))
    (is (=
          (move-rope [[0 1] [0 0]] [0 -1])
          [[0 0] [0 0]]))
    (is (=
          (move-rope [[0 0] [0 0]] [0 -1])
          [[0 -1] [0 0]]))
    (is (=
          (move-rope [[0 -1] [0 0]] [0 -1])
          [[0 -2] [0 -1]])))
  (testing "horizontal movement"
    (is (=
          (move-rope [[0 0] [0 0]] [1 0])
          [[1 0] [0 0]]))
    (is (=
          (move-rope [[1 0] [0 0]] [1 0])
          [[2 0] [1 0]]))
    (is (=
          (move-rope [[1 0] [0 0]] [-1 0])
          [[0 0] [0 0]]))
    (is (=
          (move-rope [[0 0] [0 0]] [-1 0])
          [[-1 0] [0 0]]))
    (is (=
          (move-rope [[-1 0] [0 0]] [-1 0])
          [[-2 0] [-1 0]])))
  (testing "movement that ends up in diagonal"
    (testing "vertical"
      (is (=
            (move-rope [[1 0] [0 0]] [0 1])
            [[1 1] [0 0]]))
      (is (=
            (move-rope [[-1 0] [0 0]] [0 1])
            [[-1 1] [0 0]]))
      (is (=
            (move-rope [[1 0] [0 0]] [0 -1])
            [[1 -1] [0 0]]))
      (is (=
            (move-rope [[-1 0] [0 0]] [0 -1])
            [[-1 -1] [0 0]])))
    (testing "horizontal"
      (is (=
            (move-rope [[0 1] [0 0]] [1 0])
            [[1 1] [0 0]]))
      (is (=
            (move-rope [[0 -1] [0 0]] [1 0])
            [[1 -1] [0 0]]))
      (is (=
            (move-rope [[0 1] [0 0]] [-1 0])
            [[-1 1] [0 0]]))
      (is (=
            (move-rope [[0 -1] [0 0]] [-1 0])
            [[-1 -1] [0 0]])))
    )
  (testing "diagonal movements"
    (is (=
          (move-rope [[1 1] [0 0]] [0 1])
          [[1 2] [1 1]]))
    (is (=
          (move-rope [[1 1] [0 0]] [1 0])
          [[2 1] [1 1]]))
    (is (=
          (move-rope [[-1 1] [0 0]] [0 1])
          [[-1 2] [-1 1]]))
    (is (=
          (move-rope [[-1 1] [0 0]] [-1 0])
          [[-2 1] [-1 1]]))
    (is (=
          (move-rope [[1 -1] [0 0]] [0 -1])
          [[1 -2] [1 -1]]))
    (is (=
          (move-rope [[1 -1] [0 0]] [1 0])
          [[2 -1] [1 -1]]))
    (is (=
          (move-rope [[-1 -1] [0 0]] [0 -1])
          [[-1 -2] [-1 -1]]))
    (is (=
          (move-rope [[-1 -1] [0 0]] [-1 0])
          [[-2 -1] [-1 -1]]))
    )
  )

File addition: day9.clj (---x------)

[4.40]

(ns edition2022.day9
  (:require [clojure.string :as str]))
(def example "R 4\nU 4\nL 3\nD 1\nR 4\nD 1\nL 5\nR 2")
(def example-lines (str/split-lines example))
(def example-lines2 (str/split-lines "R 5\nU 8\nL 8\nD 3\nR 17\nD 10\nL 25\nU 20\n"))
(defn expand-move [[direction times]]
  (->> (cond
         (= direction "R") [1 0]
         (= direction "L") [-1 0]
         (= direction "U") [0 1]
         (= direction "D") [0 -1])
       (iterate identity)
       (take (Integer/parseInt times))))
(defn expand-moves [lines]
  (->> lines
       (map #(str/split % #" "))
       (map expand-move)
       (apply concat)
       ))
(defn update-position [pos move]
  [(+ (first move) (first pos)) (+ (second move) (second pos))])
(defn tail-head-distance [tail head]
  (->> (interleave head tail)
       (partition 2)
       (map #(reduce - %))
       (into [])))
(defn update-tail [tail new-head]
  (let [new-distance (tail-head-distance tail new-head)]
    (cond
      (or (= [2 1] new-distance) (= [1 2] new-distance) (= [2 2] new-distance)) (update-position tail [1 1])
      (or (= [-2 1] new-distance) (= [-1 2] new-distance) (= [-2 2] new-distance)) (update-position tail [-1 1])
      (or (= [2 -1] new-distance) (= [1 -2] new-distance) (= [2 -2] new-distance)) (update-position tail [1 -1])
      (or (= [-2 -1] new-distance) (= [-1 -2] new-distance) (= [-2 -2] new-distance)) (update-position tail [-1 -1])
      (= [2 0] new-distance) (update-position tail [1 0])
      (= [0 2] new-distance) (update-position tail [0 1])
      (= [-2 0] new-distance) (update-position tail [-1 0])
      (= [0 -2] new-distance) (update-position tail [0 -1])
      :else tail)))
(defn move-rope
  ([rope move] (move-rope rope move 0 rope))
  ([rope move knot prev-rope]
   (if (= (count rope) (inc knot))
     rope
     (let [head (nth prev-rope knot)
           tail (nth rope (inc knot))
           new-head (if (= knot 0) (update-position head move) (nth rope knot))
           new-tail (update-tail tail new-head)
           ]
       (recur (assoc rope knot new-head (inc knot) new-tail) move (inc knot) rope)))
   ))
(defn execute-moves ([lines] (execute-moves lines 2))
  ([lines rope-length]
   (loop [moves (expand-moves lines)
          rope (into [] (repeat rope-length [0 0]))
          tail-visited (vector)]
     (if (empty? moves)
       tail-visited
       (let [next-move (first moves)
             new-rope (move-rope rope next-move)]
         (recur (rest moves) new-rope (conj tail-visited (last new-rope))))))))
(comment
  (tail-head-distance [0 1] [0 3])
  (tail-head-distance [-2 -1] [-1 -2])
  (expand-move ["U" 3])
  (expand-moves example-lines)
  (count (set (execute-moves example-lines)))
  (count (set (execute-moves (str/split-lines (slurp "resources/day9.in")))))
  (count (set (execute-moves example-lines2 10)))
  (count (set (execute-moves (str/split-lines (slurp "resources/day9.in")) 10)))
  (set (execute-moves example-lines2 10))
  (execute-moves ["R 4" "U 4"] 10)
  (execute-moves [(first example-lines2) (second example-lines2) (nth example-lines2 3)] 10)
  (execute-moves ["R 5" "U 8" "L 8" "D 3" "R 17"] 10)
  example-lines2
  (move-rope [[5 2] [5 1] [3 0] [2 0] [1 0] [0 0] [0 0] [0 0] [0 0] [0 0]] [0 1])
  )

File addition: day9.in (----------)

[4.10417]

L 2
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File move: deps.edn (----------) → deps.edn (---x------)
BF:BFD[3.1] → [4.62445:62477]
BF:BF[4.62477] → [4.62478:62478]
[3.1]
[4.62478]

Replacement in deps.edn at line 1 [4.62478]

B:BD[4.62478] → [2.9934:10008]

∅:D[2.10008] → [4.62489:62505]

B:BD[4.62489] → [4.62489:62505]

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[4.62478]

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