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-rwxr-xr-x2020/10/puzzle-1.sh7
1 files changed, 7 insertions, 0 deletions
diff --git a/2020/10/puzzle-1.sh b/2020/10/puzzle-1.sh
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@@ -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 }'