From 85a3d8d7dbb6ec9d09d15123d5e3953f1c97350d Mon Sep 17 00:00:00 2001
From: June McEnroe <june@causal.agency>
Date: Wed, 4 Dec 2019 02:42:48 -0500
Subject: Add alternate shell solution for day 4

---
 2019/day04.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 2019/day04.sh

(limited to '2019')

diff --git a/2019/day04.sh b/2019/day04.sh
new file mode 100644
index 0000000..6cd264a
--- /dev/null
+++ b/2019/day04.sh
@@ -0,0 +1,11 @@
+IFS=-
+read min max
+seq "$min" "$max" \
+	| grep '^1*2*3*4*5*6*7*8*9*$' \
+	| grep -E '00|11|22|33|44|55|66|77|88|99' \
+	| wc -l
+seq "$min" "$max" \
+	| grep '^1*2*3*4*5*6*7*8*9*$' \
+	| sed 's/.*/x&x/' \
+	| grep -E '[^0]00[^0]|[^1]11[^1]|[^2]22[^2]|[^3]33[^3]|[^4]44[^4]|[^5]55[^5]|[^6]66[^6]|[^7]77[^7]|[^8]88[^8]|[^9]99[^9]' \
+	| wc -l
-- 
cgit 1.4.1