Day 6 solution.

jayfoad · Dec 7, 2018 · 90acf50 · 90acf50
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diff --git a/p6.dyalog b/p6.dyalog
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+p←↑⍎¨⊃⎕NGET'p6.txt'1
+g←{1=≢z←⍸t=⌊/t←+/|p-⍤1⊢⍵:⊃z⋄¯1}¨⍳⌈⌿p
+sort←{(⊂⍋⍵)⌷⍵}
+a←sort{⍺,≢⍵}⌸,g
+b←sort{⍺,≢⍵}⌸,1 1↓¯1 ¯1↓g
+⌈/⊢/↑(↓a)∩↓b ⍝ part 1
++/,{10000>+/,|p-⍤1⊢⍵}¨⍳⌈⌿p ⍝ part 2
diff --git a/p6.txt b/p6.txt
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