Day 10 simpler, faster, more analytical solution.

jayfoad · Dec 10, 2018 · 81068cc · 81068cc
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commit 81068cc
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/p10.dyalog b/p10.dyalog
@@ -1,6 +1,7 @@
 p←↑⍎¨¨'-?\d+'⎕S'&'¨⊃⎕NGET'p10.txt'1
 q←0 2↓p ⋄ p←0 ¯2↓p
-n←(⊢⍳⌊/){+/(⌈⌿-⌊⌿)p+⍵×q}¨⍳¯2×⌊0.5+(+⌿÷≢),p÷q
+mean←+⌿÷≢
+n←⌊0.5+mean,-(p-⍤1 mean p)÷(q-⍤1 mean q)
 c←(⊢-⍤1⌊⌿)p+n×q
 ⍉'#'@(↓⎕IO+c)⊢(1+⌈⌿c)⍴'' ⍝ part 1
 n ⍝ part 2