From c15ce118475359c87f118646514291eeec08ceff Mon Sep 17 00:00:00 2001
From: Thomas Voss <mail@thomasvoss.com>
Date: Sun, 15 Dec 2024 00:51:29 +0100
Subject: Add 2019 day 4 solutions

---
 2019/04/.gitignore | 1 +
 2019/04/Makefile   | 1 +
 2019/04/puzzles.sh | 8 ++++++++
 3 files changed, 10 insertions(+)
 create mode 100644 2019/04/.gitignore
 create mode 100644 2019/04/Makefile
 create mode 100644 2019/04/puzzles.sh

(limited to '2019/04')

diff --git a/2019/04/.gitignore b/2019/04/.gitignore
new file mode 100644
index 0000000..dd596dd
--- /dev/null
+++ b/2019/04/.gitignore
@@ -0,0 +1 @@
+puzzle-[12].sh
\ No newline at end of file
diff --git a/2019/04/Makefile b/2019/04/Makefile
new file mode 100644
index 0000000..2e36725
--- /dev/null
+++ b/2019/04/Makefile
@@ -0,0 +1 @@
+include ../../Makefiles/sh.mk
\ No newline at end of file
diff --git a/2019/04/puzzles.sh b/2019/04/puzzles.sh
new file mode 100644
index 0000000..b3bcfed
--- /dev/null
+++ b/2019/04/puzzles.sh
@@ -0,0 +1,8 @@
+IFS=- read lo hi <input
+seq $lo $hi |
+	grep -E '([0-9])\1' |
+	grep -E '^0*1*2*3*4*5*6*7*8*9*$' |
+	# START PART 2
+	grep -E '^(0{2}1*2*3*4*5*6*7*8*9*|0*1{2}2*3*4*5*6*7*8*9*|0*1*2{2}3*4*5*6*7*8*9*|0*1*2*3{2}4*5*6*7*8*9*|0*1*2*3*4{2}5*6*7*8*9*|0*1*2*3*4*5{2}6*7*8*9*|0*1*2*3*4*5*6{2}7*8*9*|0*1*2*3*4*5*6*7{2}8*9*|0*1*2*3*4*5*6*7*8{2}9*|0*1*2*3*4*5*6*7*8*9{2})$' |
+	# END PART 2
+	wc -l
\ No newline at end of file
-- 
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