Add untested day11pt1

[adventofcode2019.git] / src / adventofcode2019 / day11.clj

diff --git a/src/adventofcode2019/day11.clj b/src/adventofcode2019/day11.clj
new file mode 100644 (file)
index 0000000..12213b9
--- /dev/null
+++ b/src/adventofcode2019/day11.clj
@@ -0,0 +1,42 @@
+(ns adventofcode2019.day11
+    [:require [adventofcode2019.lib :refer :all]
+              [adventofcode2019.intcode :as i]
+              [clojure.string :as str]
+              [clojure.core.match :refer [match]]])
+
+(defn painterbot-9000 [program]
+  (let [stop-on-output #(= (count (:output %)) 2)
+        get-next-ic-output (partial i/intcode-until stop-on-output)
+        rotate (fn [heading turning]
+                 (match [heading turning]
+                        [:up    0] :left
+                        [:down  0] :right
+                        [:left  0] :down
+                        [:right 0] :up
+                        [:up    1] :right
+                        [:down  1] :left
+                        [:left  1] :down
+                        [:right 1] :up))
+        travel (fn [[x y] heading]
+                 (case heading
+                   :up    [x (inc y)]
+                   :down  [x (dec y)]
+                   :left  [(dec x) y]
+                   :right [(inc x) y]))]
+    (loop [program-state (i/build-state program {:input [0]})
+           tileset {}
+           position [0 0]
+           heading :up]
+      (if (:exit program-state)
+        tileset
+        (let [next-state (get-next-ic-output program-state)
+              [color direction] (:output next-state)
+              new-heading (rotate heading direction)]
+          (recur (assoc next-state :output []) (assoc tileset position color)
+                 (travel position new-heading) new-heading))))))
+
+(defn day11 []
+  (let [input (mapv parse-int (get-list-from-file (input-file) #","))
+        painted-tiles (painterbot-9000 input)] 
+    (part1 (count painted-tiles))
+    #_(part2)))