day13

3 files changed, 921 insertions, 0 deletions

diff --git a/day13 b/day13
new file mode 100644
index 0000000..f0b79e5
--- /dev/null
+++ b/day13
@@ -0,0 +1,874 @@
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+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6
diff --git a/day13.bqn b/day13.bqn
new file mode 100644
index 0000000..af36daa
--- /dev/null
+++ b/day13.bqn
@@ -0,0 +1,9 @@
+str←•Import"bqn-libs/strings.bqn"
+dots‿folds ← str.lf‿str.lf str.Split •FChars"day13"
+dots ↩ {•BQN¨ ',' str.Split 𝕩}¨ str.lf str.Split dots
+folds ↩ { { ⟨a,b⟩: a⋈•BQN b } '=' str.Split ¯1 ⊑ ' ' str.Split 𝕩}¨ str.lf str.Split ¯1↓folds
+
+d← 1¨⌾(dots⊸⊑) 0⥊˜1+⌈´dots
+Fold ← { ⟨"x",n⟩𝕊d: (n↑d) ∨ ⌽n↑(n+1)↓d ; ⟨"y",n⟩𝕊d: "x"‿n Fold⌾⍉ d }
+•Show +´⥊(⊑ folds) Fold d
+•Show ⍉" #" ⊏˜ d Fold´ ⌽folds
diff --git a/day13.clj b/day13.clj
new file mode 100644
index 0000000..83d6611
--- /dev/null
+++ b/day13.clj
@@ -0,0 +1,38 @@
+(ns org.vuxu.aoc2021.day13
+  (:require [clojure.string :as str]
+            [clojure.set :as set]))
+
+(let [[part1 part2] (str/split (slurp "day13") #"\n\n")]
+  (def dots (set (for [line (str/split-lines part1)]
+                   (mapv parse-long (str/split line #",")))))
+  (def folds (for [line (str/split-lines part2)]
+               (let [[xy n] (take-last 2 (str/split line #" |="))]
+                 [(symbol xy)
+                  (parse-long n)]))))
+
+(defn fold [dots [xy n]]
+  (let [sel (case xy
+              x 0
+              y 1)
+        {a false b true} (group-by #(> (get % sel) n) dots)
+        a' (for [coord b]
+                 (update coord sel #(- n (- % n))))]
+    (set/union (set a) (set a'))))
+
+(def part1
+  (count (fold dots (first folds))))
+;; => 716
+
+(defn show [dots]
+  (str/join "\n"
+            (reverse
+             (for [x (range (inc (apply max (map first dots))))]
+               (apply str
+                      (for [y (range (inc (apply max (map second dots))))]
+                        (if (dots [x y]) "#" ".")))))))
+
+(def part2
+  (show (reduce fold dots folds)))
+
+(print "---\n" part2 "\n---\n")
+;; RPCKFBLR