I do sincerely apologize for the delay in responding to your message.
Thank you kindly for your suggestion, all ways you handled that are very awesome. GraphTheory and NAG C library are very useful tools for this problem and the fifa simulation by Robert Israel is also the very interesting example.

Although, the type of the data I deal with is the value not the string.... :P

This is what I want.

Thank you very much for your reply.

Thank you very much for your reply.