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Dimitri Lozeve 2024-11-12 21:43:32 +01:00
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⎕IO←0 ⋄ ⎕PP←15
p←⍎¨⊃⎕NGET'input'1
p←0,p[⍋p],3+⌈/p
×/⊢∘≢⌸2-/p ⍝ Part 1
c←0,0,1,(⌈/p)⍴0 ⍝ paths counts
{c[⍵+2]←+/c[⍵+¯1 0 1]}¨1↓p
⊃⌽c ⍝ Part 2
a←(0∘<∧≤∘3)∘.-⍨p ⍝ adjacency matrix
+/{⊃⊖({a+.×⍵}⍣⍵)a}¨⍳⍴p ⍝ Part 2, the matrix way