Day 3 solution.

jayfoad · Dec 3, 2018 · 743e1bd · 743e1bd
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diff --git a/p3.dyalog b/p3.dyalog
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+p←⍎¨¨'\d+'⎕S'&'¨⊃⎕NGET'p3.txt'1
+g←1000 1000⍴0 ⍝ grid
+{(a b c d e)←⍵ ⋄ g[(⊂c b)+⍳e d]+←1}¨p
++/,1<g ⍝ part 1
+⊃⊃p/⍨{(a b c d e)←⍵ ⋄ ∧/,1=g[(⊂c b)+⍳e d]}¨p ⍝ part 2