52 lines
1.5 KiB
BQN
52 lines
1.5 KiB
BQN
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jets ← '>'= "<>" (∊˜/⊢) •FChars "input"
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pieces ← >¨⟨1‿1‿1‿1⟩‿⟨0‿1‿0,1‿1‿1,0‿1‿0⟩‿⟨0‿0‿1,0‿0‿1,1‿1‿1⟩‿⟨⋈1,⋈1,⋈1,⋈1⟩‿⟨1‿1,1‿1⟩
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w ← 7
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initial ← 0‿w⥊0
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# Warning: mutated global!
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ji ← 0
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_try ← {(⊢ 𝕩˙⍟(≠○(+´∘⥊∘∨⟜𝕨)) 𝔽) 𝕩}
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Fall ← {
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pushed ← 𝕨 ((ji⊑jets)◶«‿»)˘ _try 𝕩
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ji ↩ (≠jets)|ji+1
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fallen ← 𝕨 » _try pushed
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𝕨 𝕊⍟(pushed≢fallen) fallen
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}
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Height ← ≠∘(∨´˘/⊢)
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ThrowPiece ← {
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piece ← 𝕩 (|˜⟜≠⊑⊢) pieces
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chamber ← (((3+≠piece)⊸+∘⊑∘(1⊸↑)∘⌽∘(1⊸+)∘/∨´˘)↑⊢)⌾⌽𝕨
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falling ← (≠chamber)↑(»⍟2 w⊸↑)˘piece
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chamber (⊣∨Fall) falling
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}
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•Out "day17.1: "∾•Fmt Height initial ThrowPiece˜´ ⌽↕2022
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# https://mlochbaum.github.io/BQN/doc/control.html#while
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While ← {𝕩{𝔽⍟𝔾∘𝔽_𝕣_𝔾∘𝔽⍟𝔾𝕩}𝕨@}´
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{
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target ← 1000000000000
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ji ↩ 0 ⋄ i ← 0 ⋄ res ← @
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chamber ← initial
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cycles ← ⟨≠pieces,≠jets⟩⥊<⟨⟩
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While {𝕤⋄res=@}‿{𝕤
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chamber ↩ chamber ThrowPiece i
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i +↩ 1
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t ← i|˜≠pieces
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cycles ↩ {
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new ← 𝕩∾<i⋈Height chamber
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res ↩ {𝕊 𝕩:
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⟨pl,hl⟩‿· ← chk ← ¯2↑new
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pd‿hd ← -´⌽chk
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@˙⍟(0≠pd|target-pl) hl+hd×pd÷˜target-pl
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}⍟(1<≠new) @
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new
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}⌾(t‿ji⊸⊑) cycles
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}
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•Out "day17.2: "∾•Fmt res
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}
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