From 6c7336937b4ccb0c72b54035d4f1ee16761f040d Mon Sep 17 00:00:00 2001
From: June McEnroe <june@causal.agency>
Date: Fri, 18 Dec 2020 00:53:14 -0500
Subject: Solve day 18 part 2

Is it cheating to implement the FORTRAN I approach[1] as preprocessing?
Maybe.

[1]: https://en.wikipedia.org/wiki/Operator-precedence_parser#Alternative_methods
---
 2020/day18-2.sh | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 2020/day18-2.sh

(limited to '2020')

diff --git a/2020/day18-2.sh b/2020/day18-2.sh
new file mode 100644
index 0000000..1f49446
--- /dev/null
+++ b/2020/day18-2.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+sed '
+s/(/&((/g
+s/)/))&/g
+s/*/))*((/g
+s/+/)+(/g
+s/^/((/
+s/$/))/
+' | ./day18
-- 
cgit 1.4.1