From: Ben Harris <bjh21@bjh21.me.uk>
Date: Thu, 9 May 2024 08:25:58 +0000 (+0100)
Subject: 09a: successfully tracing path using fold
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~bjharris/git?a=commitdiff_plain;h=1bdde04838c5787108e3ab2aa87a4c232184f480;p=aoc-2022.git

09a: successfully tracing path using fold
---

diff --git a/09/09a.bqn b/09/09a.bqn
new file mode 100644
index 0000000..1c46524
--- /dev/null
+++ b/09/09a.bqn
@@ -0,0 +1,15 @@
+
+Prep←{
+  directions←⍉['U'‿⟨0,1⟩,'D'‿⟨0,¯1⟩,'L'‿⟨¯1,0⟩,'R'‿⟨1,0⟩]
+  dirs←((⊏directions)⊐⊏⍉𝕩)⊏(1⊏directions)
+  dists←•ParseFloat˘2↓˘𝕩
+  dists/dirs
+}
+
+Step←{m𝕊⟨h,t⟩:h+↩m,t+↩(×h-t)×(∨´1<|h-t),•Show⟨h,t⟩}
+
+Main←{
+  ⟨⟨0,0⟩,⟨0,0⟩⟩Step´⌽𝕩
+}
+
+•Show Main Prep>•file.Lines ⊑•args