Day 11 solution.

jayfoad · Dec 11, 2018 · 674d67f · 674d67f
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diff --git a/p11.dyalog b/p11.dyalog
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+⎕IO←1
+p←⍎⊃⊃⎕NGET'p11.txt'1
+g←{r y←10 0+⍵ ⋄ ¯5+10|⌊100÷⍨r×p+y×r}¨⍳300 300 ⍝ grid
+¯1+⊃⍸{⍵=⌈/,⍵}{+/,⍵}⌺3 3⊢g ⍝ part 1
+1↓{(⊃⍒⍵)⌷⍵}↑1{0>m←⌈/,t←{+/,⍵}⌺⍺ ⍺⊢g:⍵ ⋄ (⍺+1)∇⍵,⊂m,((⊃⍸m=t)-⌊0.5×⍺-1),⍺}⍬ ⍝ part 2
diff --git a/p11.txt b/p11.txt
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+5468