day22

3 files changed, 481 insertions, 1 deletions

diff --git a/day22 b/day22
new file mode 100644
index 0000000..2910022
--- /dev/null
+++ b/day22
@@ -0,0 +1,420 @@
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diff --git a/day22.clj b/day22.clj
new file mode 100644
index 0000000..a89c1e4
--- /dev/null
+++ b/day22.clj
@@ -0,0 +1,59 @@
+(ns org.vuxu.aoc2021.day22
+  (:require [clojure.string :as str]
+            [clojure.set :as set]))
+
+(def data
+  (->> (slurp "day22")
+       str/split-lines
+       (map (partial re-seq #"(?:on|off|-?\d+)"))
+       (map (fn [[cmd & coords]]
+              [(= cmd "on") (mapv parse-long coords)]))))
+
+(defn step [state [cmd [x1 x2 y1 y2 z1 z2]]]
+  ((if cmd set/union set/difference)
+   state
+   (set (for [x (range x1 (inc x2))
+              y (range y1 (inc y2))
+              z (range z1 (inc z2))]
+          [x y z]))))
+
+(def part1
+  (->> data 
+       (filter (fn [[cmd [x1 x2 y1 y2 z1 z2]]]
+                 (and (<= -50 x1 x2 50)
+                      (<= -50 y1 y2 50)
+                      (<= -50 z1 z2 50))))
+       (reduce step #{})
+       count))
+;; => 647062
+
+(def combined
+  (reduce
+   (fn [cubes [cmd1 [xmin1 xmax1 ymin1 ymax1 zmin1 zmax1] :as ins1]]
+     (let [ncubes
+           (for [[cmd2 [xmin2 xmax2 ymin2 ymax2 zmin2 zmax2]] cubes
+                 :let [xmin (max xmin1 xmin2)
+                       xmax (min xmax1 xmax2)]
+                 :when (<= xmin xmax)
+                 :let [ymin (max ymin1 ymin2)
+                       ymax (min ymax1 ymax2)]
+                 :when (<= ymin ymax)
+                 :let [zmin (max zmin1 zmin2)
+                       zmax (min zmax1 zmax2)]
+                 :when (<= zmin zmax)]
+             [(not cmd2) [xmin xmax ymin ymax zmin zmax]])]
+       (cond-> (concat cubes ncubes)
+         cmd1
+         (conj ins1))))
+   []
+   data))
+
+(def part2
+  (reduce (fn [acc [cmd [x1 x2 y1 y2 z1 z2]]]
+            (+ acc (* (if cmd 1 -1)
+                      (- x2 x1 -1)
+                      (- y2 y1 -1)
+                      (- z2 z1 -1))))
+          0
+          combined))
+;; => 1319618626668022
diff --git a/deps.edn b/deps.edn
index 22490f9..e440943 100644
--- a/deps.edn
+++ b/deps.edn
@@ -1,2 +1,3 @@
 {:deps
- {org.clojure/clojure {:mvn/version "1.11.0-alpha3"}}}
+ {org.clojure/clojure {:mvn/version "1.11.0-alpha3"}
+  org.clojure/core.match {:mvn/version "1.0.0"}}}