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⟨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
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