From e85a8dcff518e1cb90a42585bd8954bf70fa097b Mon Sep 17 00:00:00 2001
From: Jeremy Kaplan <code@jdkaplan.dev>
Date: Thu, 1 Jan 2026 16:17:51 -0500
Subject: [PATCH] 2025 Day 11 Part 2

---
 2025/day11.ua | 106 +++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 88 insertions(+), 18 deletions(-)

diff --git a/2025/day11.ua b/2025/day11.ua
index a3ff4b6..c1aa5a0 100644
--- a/2025/day11.ua
+++ b/2025/day11.ua
@@ -1,23 +1,93 @@
 ~ "aoc.ua" ~ Lines
 
 Lines &fras "input/day11.txt"
-≡◇(
-  ∩□ °$"_: _"
-)
-⊙≡◇(□ °/$"_ _")
-map
 
-0
-{["you"]}
-⍢(⊃(⊢∘|↘1∘|⋅⊙∘)
-  # Path Agenda' Count Edges
-  ≍"out"⊸◇⊢
-  ⨬(◡⊃(◇⊢|⋅⋅⋅∘)
-    °□get
-    ≡⌟⍚⊂
-    ⊂
-  | ⋅⊙⊃(+1∘|⋅∘)
-  )
-| >0 ⧻
+⍚(
+  °$"_: _"
+  ⊙(◇⋕₃₆°/$"_ _")
+  ⋕₃₆
+  ≡⌞⊂
 )
-⋅⊙◌
+⍆ /◇⊂
+Edges ←
+
+# Queue ? Edges
+TopoSort ← (
+  $Edges
+
+  °˜⊟ ⊸⍉
+  ◴▽¬⊸∊
+  $Queue
+
+  ⊙($Nodes[])
+
+  ⍢( # Queue Nodes Edges
+    °⊂
+    # N Queue' Nodes Edges
+    ⊃(⊙∘|⊂⊙⋅∘)
+    # N Queue' Nodes' Edges
+    ◡(
+      ⊕□ ⊸≡(≠⊙⊢) ⊙⋅⋅∘
+      ∩°□ ⊃(⍣⊡[]0|⍣⊡[]1)
+      ≡⊣
+    )
+    # Neighbors Edges' N Queue' Nodes' Edges
+    ⊓($Neighbors|$Edges|◌|$Queue|$Nodes|◌)
+    ◡(˜▽⟜(¬˜∊) ⊙≡⊣∘)
+    ⊙◌
+    ⊃($Queue ⊂⊙⋅∘|⋅⋅⋅∘|⋅∘)
+  | >0⧻
+  )
+
+  ⋅⊙◌
+)
+
+# Count ? Edges End Start
+Paths ← (
+  ⊓($Edges|$End|$Start)
+  $Queue ⊸TopoSort
+
+  ⍢(↘1|≠⊢⊙⋅∘)
+
+  # ⍢(↘¯1|≠⊣⊙⋅⋅∘)
+  ⊙⊙◌
+
+  ⟜($Counts insert⊢⊙(1 []))
+  ↘1
+
+  ⍢(°⊂
+    # N Queue' Counts Edges
+    ◡(⊙⋅⋅∘
+      ▽⊸≡(=⊙⊢∘)
+      ≡⊣
+    )
+    $Neighbors
+
+    ◡(⊙⋅⋅⊙
+      /+≡⌟(⍣get0)
+    )
+    ⊃(⋅⋅⋅∘|insert ⊃(⋅⋅∘|⊙⋅⋅⋅∘))
+  | >0⧻
+  )
+  ⋅⊙◌
+  ⍣˜get0
+)
+
+Part₁ ← Paths⊙(∩⋕₃₆ "out" "you")
+
+Without ← ▽⊸≡(≠⊙⊢∘)
+
+Part₂ ← (
+  ⊃(
+  | Paths ∧Without (◇⋕₃₆ {"out" "dac"}) ⊙(∩⋕₃₆ "fft" "svr")
+  | Paths ∧Without (◇⋕₃₆ {"svr" "out"}) ⊙(∩⋕₃₆ "dac" "fft")
+  | Paths ∧Without (◇⋕₃₆ {"fft" "svr"}) ⊙(∩⋕₃₆ "out" "dac")
+  | Paths ∧Without (◇⋕₃₆ {"out" "fft"}) ⊙(∩⋕₃₆ "dac" "svr")
+  | Paths ∧Without (◇⋕₃₆ {"svr" "out"}) ⊙(∩⋕₃₆ "fft" "dac")
+  | Paths ∧Without (◇⋕₃₆ {"dac" "svr"}) ⊙(∩⋕₃₆ "out" "fft")
+  )
+  +⊓(××|××)
+)
+
+Part₁ Edges
+Part₂ Edges