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-rw-r--r--users/sterni/exercises/aoc/2022/12/12.bqn16
1 files changed, 16 insertions, 0 deletions
diff --git a/users/sterni/exercises/aoc/2022/12/12.bqn b/users/sterni/exercises/aoc/2022/12/12.bqn
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+++ b/users/sterni/exercises/aoc/2022/12/12.bqn
@@ -0,0 +1,16 @@
+⟨ImportBqnLibs,_fix⟩ ← •Import "../../lib.bqn"
+⟨ReplaceAll⟩ ← ImportBqnLibs "strings.bqn"
+i ← >•FLines "input"
+
+elevation ← 'a'-˜⟨"S","E"⟩‿⟨"a","z"⟩ ReplaceAll⌾⥊ i
+starts ← (⊏⟜∞‿0)¨⟨'S'=i,0=elevation⟩
+end ← 'E'=i
+
+Step ← {
+  𝕊 steps:
+  Go ← {𝕏⁼((⊢∾¨↕∘≢)(≤⟜(∞⊸»˘∘+⟜1))˜𝕏elevation)⊑>((⥊⟜∞)∘≢⊸⋈)˜∞⊸»˘1+𝕏steps}
+  steps⌊´Go¨⟨⊢,⌽˘,⍉,⍉⌽⟩
+}
+Shortest ← {⊑end/⊸⊏○⥊Step _fix 𝕩}
+
+•Out¨ "day12.1: "‿"day12.2: "∾¨ •Fmt∘Shortest¨ starts