I saw on MSE a question about an algorithm in C++ for listing combinations of objects. I unfortunately can't provide you the link because the question has been deleted by the user. Since it is specific to a programmation language it was clear to me that the question should be closed as "off-topic" and moved to StackOverflow. However, the only targets proposed were:
I can imagine that there is a good reason why we can't choose any StackExchange platform. Relation between maths and informatics can sometimes be very tight, so why Stack Overflow isn't in this list?