If you browse the algorithms tag on SO often, you'll see a lot of questions about code challenges found online. I don't see this as a problem, provided people are trying to get help rather than a "give teh code" situation.
I'm asking in light of the DMCA notices that have been received from codility.com. Questions like these have been deleted simply due to the notices received. I can't fault the SE team for doing this, whether or not they believe the case is valid. I've received a DMCA notice for an app I wrote, and while I believe it was not infringing, it's not worth the hassle to fight.
The biggest problem I see is that askers are sometimes encouraged to paste the problem statement into the question. If the OP (often a new user) complies with the community's request, it's in danger of being deleted whenever codility next decides to send out notices. If they don't, they might appear uncooperative and garner down/close votes.
Note that I'm not commenting on the merit of the notices. I'm looking for official guidance on what to do in these circumstances. This way if anyone asks why we did "X" to their question, we can link to a post explaining the policy.
Do we encourage only links to the challenge site? If so, what happens if/when links go bad?
A brief description of the problem? Note that sometimes the problem is that the OP misinterprets the statement, so their description may not match the actual problem.
When we see pasted problem statements, should we edit them out and replace them with a link, etc?