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$ RL
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$
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$ AAA = (BBB, CCC)
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$ BBB = (DDD, EEE)
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$ CCC = (ZZZ, GGG)
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$ DDD = (DDD, DDD)
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$ EEE = (EEE, EEE)
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$ GGG = (GGG, GGG)
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$ ZZZ = (ZZZ, ZZZ)
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TestInput ←
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$ LLR
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$
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$ AAA = (BBB, BBB)
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$ BBB = (AAA, ZZZ)
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$ ZZZ = (ZZZ, ZZZ)
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TestInputII ←
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$ LR
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$
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$ 11A = (11B, XXX)
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$ 11B = (XXX, 11Z)
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$ 11Z = (11B, XXX)
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$ 22A = (22B, XXX)
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$ 22B = (22C, 22C)
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$ 22C = (22Z, 22Z)
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$ 22Z = (22B, 22B)
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$ XXX = (XXX, XXX)
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TestInputIII ←
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ParseI ← (
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⊓⊢≡(°[⊙⊙∘]≡°□↘1⊢regex"(.{3}) = \\((.{3}), (.{3})\\)")∩≡°□⊃↙↘1⊜□≠@\n.
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⊙⊙⊙⊟⊃(∘|°⊟⊗"AAA"_"ZZZ"⋅∘|⊗:⋅⊙∘|⊗:⋅⊙⋅∘)
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)
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ParseII ← (
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⊓⊢≡(°[⊙⊙∘]≡°□↘1⊢regex"(.{3}) = \\((.{3}), (.{3})\\)")∩≡°□⊃↙↘1⊜□≠@\n.
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⊙⊙⊙⊟⊃(∘|°⊟≡(⊚⌕)"AZ"¤≡(⊢⇌)⋅∘|⊗:⋅⊙∘|⊗:⋅⊙⋅∘)
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)
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PartI ← ⊙⋅⋅⋅;⍢⊃(
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+1
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| ⋅∘
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| ⊡⊟⊗⊙"LR"⊡◿⧻,⊙⊙⊙⋅∘
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| ⋅⋅⋅⊙∘
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)(¬∊⋅⋅⊙∘) 0
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Lcm ← ×÷⊃(+⍢⊃◿∘(≠0×)⊃↧↥|⊙∘)
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PartII ← /Lcm≡(PartI)¤⊙⊙∩¤
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PartI ParseI TestInput
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PartI ParseI TestInputII
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PartII ParseII TestInputIII
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PartI ParseI &fras "day08.in"
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PartII ParseII &fras "day08.in"
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