1 files changed, 19 insertions, 0 deletions
diff --git a/2018/day02-1.sh b/2018/day02-1.sh
new file mode 100644
index 0000000..695959f
--- /dev/null
+++ b/2018/day02-1.sh
@@ -0,0 +1,19 @@
+alpha='a b c d e f g h i j k l m n o p q r s t u v w x y z'
+twos() {
+	for a in $alpha; do
+		tr -c -d "$a\n" < $1 \
+			| grep -n '^..$' \
+			| cut -d ':' -f 1
+	done | sort -u | wc -l
+}
+threes() {
+	for a in $alpha; do
+		tr -c -d "$a\n" < $1 \
+			| grep -n '^...$' \
+			| cut -d ':' -f 1
+	done | sort -u | wc -l
+}
+input=$(mktemp)
+cat > $input
+echo $(( $(twos $input) * $(threes $input) ))
+rm $input