Can't tell if this is a troll comment or not.

It seems to me that the picture on the left preceeds the picture on the right; that the three arrows are suggesting you move the three lines inwards, forming the second scenario.

I actually figured it out and came to delete my comment. Might as well leave it up since your image is a good example. Thanks for sharing!

I found this online Ignore the left one, I am not sure what it means.

Agreed. The description needs to be updated.

Simple for loop is OK, the only question is: how far to loop? :)

It does. I used a simple for loop because the test made it seem like runtime wasn't a big deal. Will optimize.

Thank you.

Please see if this explains things: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#when-i-run-tests-everything-passes-but-when-i-hit-attempt-tests-fail