# no
# Day11 ⇐ {
#   input ← >{·‿s‿o‿p‿t‿f:
#       ⟨⥊•BQN '‿'⍟(','⊸=)¨ 18↓s
#        •BQN∘(«23↓o)⎊⊢ ('+'=⊑23↓o)◶×‿+ ⊢
#        •BQN 21↓p, •BQN 29↓t, •BQN 30↓f⟩
#     }∘(6⊸↑)¨ 7 Chunk •FLines 𝕩
#   start ← >⋈⟜0¨⊏˘input ⋄ info ← 1↓˘input ⋄ mod ← ×´1⊑˘info
#   Go ← {n‿d𝕊𝕩:
#     Turn ← {i𝕊m:
#       x‿n ← i⊏m ⋄ O‿p‿t‿f ← i⊏info
#       y ← (0⊸=p⊸|)⊸⊔ mod| ⌊d÷˜ O x
#       l‿r ← ⊑⎊⟨⟩⟜y¨↕2
#       (∾⟜l)⌾(f‿0⊸⊑) (∾⟜r)⌾(t‿0⊸⊑) ⟨⟨⟩,n+≠x⟩⌾(i⊸⊏) m
#     }
#     Round ← {𝕩 Turn´ ⌽↕≠𝕩}
#     ×´2↑∨1⊏˘ Round⍟n 𝕩
#   }
#   20‿3 Go start
#   # ⟨10⋆5,1⟩ Go start
# }

Day12 ⇐ {
  map ← >•FLines 𝕩
  # start‿end ← {⊑(𝕩⊸= /○⥊ ↕∘≢)map}¨ "SE"
  start‿end ← "SE"⊐˜⥊map
  map {'S':0; 'E':25; 𝕩-'a'}¨↩
  i_h ← ⥊ (↕∘≢∾¨⊢) map
  Adj ← {∞⍟¬ (1=+´2↑r)∧∧´1≥(r←|𝕨-𝕩)}
  a ← Adj⌜˜ i_h
  a {0⍟(=´𝕩)𝕨}¨⟜(↕≢)↩
  a
}
•Show Day12 ⊑•args