Hints for haybale stacking and painting the barn gold

[IDON-TEXIST]

Place an "x" in the corresponding checkbox if it is done or does not apply to this pull request.

• [X] I have tested my code.
• [X] I have added my solution according to the steps here.
• [X] I have followed the code conventions mentioned here.
  • I understand that if it is clear that I have not attempted to follow these conventions, my PR will be closed.
  • If changes are requested, I will re-request a review after addressing them.
• [X] I have linked this PR to any issues that it closes. Long term goal: hints for all starred hard+ problems. Y'know, in like, a couple years.