1 files changed, 14 insertions, 0 deletions
diff --git a/users/sterni/exercises/aoc/2022/18/18.bqn b/users/sterni/exercises/aoc/2022/18/18.bqn
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index 000000000000..76ec569fed41
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+++ b/users/sterni/exercises/aoc/2022/18/18.bqn
@@ -0,0 +1,14 @@
+lib ← •Import "../../lib.bqn"
+
+i ← (lib.ReadDec¨(<',')⊸lib.SplitOn)¨ •FLines "input"
+dim ← 1+⌈´i
+cubes ← i∊˜↕dim
+
+views ← ⟨0‿1‿2, 1‿2‿0, 2‿0‿1⟩
+Exposed ← {(6×+´⥊𝕩)-2×+´views{+´⥊(∧˝˘)2↕𝕨⍉𝕩}¨<𝕩}
+Interior ← {(¬𝕩)∧´views{((lib.Xor`∘((∊∧⊢)∨»∘(∊⌾⌽∧⊢)))⎉1)⌾(𝕨⊸⍉)𝕩}¨<𝕩}
+Displace ← {⌈´(⥊⊢‿⌽⋈⌜views){F‿a 𝕊 𝕩:((-∘¬∘(»((0⊸=⊣)∧>)⊢)⌈⊢)⎉1)⌾(F a⊸⍉)𝕩}¨<𝕩}
+Exterior ← (⊢-○Exposed ¯1⊸=∘(Displace lib._fix)∘(-∘Interior+⊢))
+
+•Out "day18.1: "∾•Fmt Exposed cubes
+•Out "day18.2: "∾•Fmt Exterior cubes