From: Ben Harris <bjh21@bjh21.me.uk>
Date: Wed, 29 May 2024 12:59:41 +0000 (+0100)
Subject: 20a closer
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~bjharris/git?a=commitdiff_plain;h=f6ed13b0776d19af1064e1e83dcea1471428cad2;p=aoc-2022.git

20a closer

Now the only problem is when a number lands precisely on the boundary.
---

diff --git a/20/20a.bqn b/20/20a.bqn
index 897c8ce..be328ad 100644
--- a/20/20a.bqn
+++ b/20/20a.bqn
@@ -3,8 +3,16 @@ Prep←•ParseFloat¨
 Main←{ 𝕊 orig:
   •Show orig
   cur←orig
-  JumpFwd←{(1⊸⌽)⌾(((1+|𝕨)⊸↑)∘((⊑𝕩⊐𝕨)⊸⌽)) 𝕩}
-  Jump←{𝕨≥0 ? 𝕨 JumpFwd 𝕩; ⌽ 𝕨 JumpFwd ⌽𝕩}
+  #JumpFwd←{(1⊸⌽)⌾(((1+|𝕨)⊸↑)∘((⊑𝕩⊐𝕨)⊸⌽)) 𝕩}
+  #Jump←{𝕨≥0 ? 𝕨 JumpFwd 𝕩; ⌽ 𝕨 JumpFwd ⌽𝕩}
+  Jump←{
+    from ← ⊑𝕩⊐𝕨
+    to ← (¯1+≠𝕩)|𝕨+from
+    len ← to-from
+    •Show from‿to‿len
+    •Show ((1+|len)⊸↑∘((to⌊from)⊸↓)) 𝕩
+    ((×len)⊸⌽) ⌾ ((1+|len)⊸↑∘((to⌊from)⊸↓)) 𝕩
+  }
   {
     •Show cur ↩ 𝕩 Jump cur
   }¨orig