2 files changed, 1015 insertions, 0 deletions
diff --git a/2021/2.in b/2021/2.in
new file mode 100644
index 0000000..b7b994b
--- /dev/null
+++ b/2021/2.in
@@ -0,0 +1,1000 @@
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diff --git a/2021/2.sh b/2021/2.sh
new file mode 100755
index 0000000..360b5fc
--- /dev/null
+++ b/2021/2.sh
@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+{
+	echo 'h=0'
+	echo 'd=0'
+	cat 2.in | sed 's/forward/h+=/; s/down/d+=/; s/up/d-=/; s/^/: $((/; s/$/))/'
+	echo 'echo $((h * d))'
+} | bash
+
+{
+	echo 'h=0'
+	echo 'a=0'
+	echo 'd=0'
+	cat 2.in | sed 's/forward \(.*\)/: $((h+=\1)) $((d+=a*\1))/; s/down \(.*\)/: $((a+=\1))/; s/up \(.*\)/: $((a-=\1))/'
+	echo 'echo $((h * d))'
+} | bash