Starting with today, I am going to change the system at which problems and solutions are posted, to avoid spoiling solutions for people who do not want to be spoiled.
For each problem post, there will be a corresponding solution post, with category Solution. The two posts will refer to each other.
The problem post will simply post the problem and a link to the solution post.
The solution post will repeat the problem, and then post the solution behind a "More" link.