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Last active December 7, 2022 20:00
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07.dyalog
x _ z←↓⍉↑' '(≠⊆⊢)¨⊃⎕nget'7.txt'1
a←{0::0 ⋄ ⍎⍵}¨x ⋄ s←⍬
t←{s⊢←s(¯1↓s)(s,⊂⍵)⊃⍨' .'⍳⊃⍵}¨z
+/r/⍨1e5≥r←a+.×t∘.(⊃⍷⍨)∪t ⍝ part 1
⌊/r/⍨r≥⊃r-4e7 ⍝ part 2
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