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Created December 5, 2021 01:52
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04.dyalog
p←(⊢⊆⍨0≠≢¨)⊃⎕nget'04.txt'1
ns←⍎⊃⊃p ⋄ bs←↑↑⍎¨¨1↓p ⋄ cs←∨⍀bs∘=⍤0⊢ns
m←{(⍺⌷ns)×+/(~⍺⍵⌷cs)/⍥,⍵⌷bs}
m/⊃⍸rs←(∨/∧⌿,∧/)⍤2⊢cs ⍝ part 1
m/1 0+⊃⌽⍸rs⍷⍨⍪0 1 ⍝ part 2
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