X-Git-Url: https://git.sommitrealweird.co.uk/advent-of-code-2021.git/blobdiff_plain/69b45c947e9cdf6a41bf54ca8f7fe50b8c608bcc..a8478dc6f1b0da0421ec3c07ce400aeb8b39a9eb:/day02/sub.sh

diff --git a/day02/sub.sh b/day02/sub.sh
new file mode 100644
index 0000000..b8040aa
--- /dev/null
+++ b/day02/sub.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+exec 3<input.txt
+depth=0
+horizontal=0
+aim=0
+aim_depth=0
+aim_horizontal=0
+
+while read -a things -u 3; do
+    case ${things[0]} in
+        up)
+            ((depth-=${things[1]}))
+            ((aim-=${things[1]}))
+            ;;
+        down)
+            ((depth+=${things[1]}))
+            ((aim+=${things[1]}))
+            ;;
+        forward)
+            ((horizontal+=${things[1]}))
+            depth_calc=$((things[1]*aim))
+            ((aim_depth+=$depth_calc))
+            ((aim_horizontal+=${things[1]}))
+            ;;
+    esac
+done
+
+echo "horz * depth = $((depth*$horizontal))"
+echo "aimed version = $((aim_depth*$aim_horizontal))"