From e7c9108b95e39d7ea5a29ae06d619c4727f11027 Mon Sep 17 00:00:00 2001
From: Thomas Voss <thomasvoss@live.com>
Date: Fri, 29 Oct 2021 23:02:39 +0200
Subject: Initial commit

---
 2020/10/puzzle-1.sh | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100755 2020/10/puzzle-1.sh

(limited to '2020/10/puzzle-1.sh')

diff --git a/2020/10/puzzle-1.sh b/2020/10/puzzle-1.sh
new file mode 100755
index 0000000..f31af02
--- /dev/null
+++ b/2020/10/puzzle-1.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+
+sort -n input | awk '
+BEGIN  { o = t = 1 }
+NR > 1 { if ($0 - prev == 1) o++; else if ($0 - prev == 3) t++; }
+       { prev = $0 }
+END    { print o * t }'
-- 
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