I have ideas on problems and would like to write a codeforces round, so how should I do so? (I know some basics for writing problems (though I'm not quite familiar with the testlib library).)

UPD : I finished all problems and uploaded all of them on polygon, but I still haven't get a reply (my message wasn't even seen yet) :(

UPD2 : Got a reply. Thanks to everyone who commented!