From 4bf733471e3b452886e7e4162e48921c70ae8dd1 Mon Sep 17 00:00:00 2001
From: rhiannon morris <rhi@rhiannon.website>
Date: Sun, 4 Dec 2022 10:03:30 +0100
Subject: [PATCH] bqn

---
 aoc.bqn | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/aoc.bqn b/aoc.bqn
index fe5d978..3f05432 100644
--- a/aoc.bqn
+++ b/aoc.bqn
@@ -23,3 +23,12 @@ Day3 ⇐ {
   (A⋈B) •FLines 𝕩
 }
 # ⟨ 7683 2488 ⟩
+
+Day4 ⇐ {
+  Line ← •BQN∘> '‿'⍟(∊⟜"-,")¨ # hehe
+  A ← {a‿b‿c‿d:(∧´c‿b≥¨a‿d)∨∧´d‿a≥¨b‿c}
+  B ← {a‿b‿c‿d:(∧´c‿b≥¨a‿c)∨∧´a‿d≥¨c‿a}
+  +´˘⍉>((A⋈B)Line)¨•FLines𝕩
+}
+# ⟨ 536 845 ⟩
+# •Show Day4 ⊑•args