From bb2cca8a3182f3d6768b13e71fe1356d293cbe44 Mon Sep 17 00:00:00 2001
From: Jeremy Kaplan <code@jdkaplan.dev>
Date: Mon, 15 Dec 2025 01:39:48 -0500
Subject: [PATCH] 2025 Day 5 Part 2

---
 2025/day05.ua | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/2025/day05.ua b/2025/day05.ua
index 0cfe937..769f0b3 100644
--- a/2025/day05.ua
+++ b/2025/day05.ua
@@ -12,4 +12,32 @@ Items ←
 
 Contains ← ×⊃(≤⊙⊢|≥⊙⊣)
 
-/+ ≡(>₀/+) ⊞Contains Items Ranges
+Part₁ ← /+ ≡(>₀/+) ⊞Contains Items
+
+# Overlaps ? A B
+Overlap ← ≤ ⊣ ⊙⊢
+
+# Range ? A B
+Join ← ⊂⊃(/↧⊂⊢⊙⊢|/↥⊂⊣⊙⊣)
+
+Part₂ ← (
+  ⍢(
+  | # Changed Ranges' ? Ranges
+    ⍆
+    ⊸(↘₋₁⟜↘₁)
+    ˜⊂0≡Overlap
+    ˜⨂ 1
+    ⤚≠ ⊙⊸⧻
+    ⨬(⋅0
+    | ⊃(↙
+      | ¤ Join °⊟⊏ ⊂⟜+₁
+      | ↘+₂)
+      ⊂⊂
+      1
+    )
+  )
+  /+ ≡(+₁ -⊃⊢⊣)
+)
+
+Part₁ Ranges
+Part₂ Ranges