From 9a4ea19ae955c86312c62098830a0f0e2994196d Mon Sep 17 00:00:00 2001
From: Thomas Voss <thomasvoss@live.com>
Date: Wed, 1 Dec 2021 19:15:48 +0100
Subject: Add day 19 solutions

---
 2015/19/puzzle-2.sh | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100755 2015/19/puzzle-2.sh

(limited to '2015/19/puzzle-2.sh')

diff --git a/2015/19/puzzle-2.sh b/2015/19/puzzle-2.sh
new file mode 100755
index 0000000..78c3ce5
--- /dev/null
+++ b/2015/19/puzzle-2.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env sh
+
+# I could not figure this out on my own, but god bless this guy for doing the math:
+# https://www.reddit.com/r/adventofcode/comments/3xflz8/day_19_solutions/cy4etju/
+
+# Some people has inputs that could be solved by just going in reverse trivially, my input did not
+# work
+
+sed -n '
+$ {
+	s/^/0/
+	s/\(Ar\|Rn\)//g
+	s/\(Y\|$\)/-1/g
+	s/[A-Z][a-z]*/+1/g
+	p
+}' input | bc
-- 
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