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Dimitri Lozeve 2024-11-12 21:43:32 +01:00
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2019/day03/day03.dyalog Normal file
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⎕io←0
p←','(≠⊆⊢)¨⊃⎕nget'input.txt'1
segment←{x y←⍺ ⋄ 'R'=⊃⍵:{x y+⍵}¨1↓,⍳(1+⍎1↓⍵),1 ⋄ 'L'=⊃⍵:{x y+⍵}¨1↓,-⍳(1+⍎1↓⍵),1 ⋄ 'D'=⊃⍵:{x y+⍵}¨1↓,-⍳1,1+⍎1↓⍵ ⋄ 'U'=⊃⍵:{x y+⍵}¨1↓,⍳1,1+⍎1↓⍵}
path←{x←⊂0 0 ⋄ 1↓x⊣{x,←(⊃⌽x) segment ⍵}¨⍵}
⌊/+/↑(path ⊃0⌷p) ∩ path ⊃1⌷p ⍝ part 1
c←(path ⊃0⌷p)∩path ⊃1⌷p
2+⌊/((path ⊃0⌷p)⍳c)+(path ⊃1⌷p)⍳c ⍝ part 2