Recently the challenge Word with greatest repeat of letters was posted. The OP said that it was inspired by a question on Stack Overflow, in which the user sought assistance with a solution to a Coderbyte challenge (specifically Letter Count I). The challenge posed here amounts to a reproduction of the Coderbyte challenge, since it asks the question that the SO post was trying to solve.
I wasn't able to find any copyright information about Coderbyte challenges. How should such posts here be handled?