Just want to make a quick thank-you to the problemsetters. We've been getting a nonstop inflow of contests, and our competitive programming lives couldn't be better. But we shouldn't forget that that without many hours (I'm sure at least 20+ per contest) of collective effort on the part of CodeForces staff and problemsetters who contribute their own time for the community's benefit, we wouldn't be able to enjoy a constant influx of original problems. So, thank you.
I hope more and more people will contribute interesting problems, and once I reach a level where I can come up with cool new problems, I hope to become a problemsetter for you guys.
how can i sent a problem to author,,,,and if u tell what should be pattern then it will be helpfull for me
A person who creates the problem is the author. If you have problems and you want to use them, you can upload them at spoj, or use polygon. And if you want your prob to be in a CF contest, ask GlebsHP