1 files changed, 9 insertions, 0 deletions
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