From: Ben Harris <bjh21@bjh21.me.uk>
Date: Thu, 9 May 2024 12:34:55 +0000 (+0100)
Subject: 09a: split head and tail steps
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~bjharris/git?a=commitdiff_plain;h=0d7155cd019e8669a432cbb2c388e4c331a8b1ac;p=aoc-2022.git

09a: split head and tail steps
---

diff --git a/09/09a.bqn b/09/09a.bqn
index 4cb47cc..9d0161a 100644
--- a/09/09a.bqn
+++ b/09/09a.bqn
@@ -2,11 +2,13 @@
 Prep←{
   directions←⍉['U'‿⟨0,1⟩,'D'‿⟨0,¯1⟩,'L'‿⟨¯1,0⟩,'R'‿⟨1,0⟩]
   dirs←((⊏directions)⊐⊑¨𝕩)⊏(1⊏directions)
-  dists←•ParseFloat¨2↓¨𝕩
+  dists←{•ParseFloat 2↓𝕩}¨𝕩
   dists/dirs
 }
 
-Step←{⟨h,t⟩𝕊m:h+↩m,t+↩(×h-t)×(∨´1<|h-t),⟨h,t⟩}
+StepH←{h𝕊m:h+m}
+StepT←{t𝕊h:t+(×h-t)×(∨´1<|h-t)}
+Step←{⟨h,t⟩𝕊m:h StepH↩m,t StepT↩h,⟨h,t⟩}
 
 Main←{+´∊1⊑¨ (<⟨⟨0,0⟩,⟨0,0⟩⟩)Step`𝕩}