Hi All, I just noticed one thing. In any problem page, if you want to submit a solution, you choose a file and then submit. But the catch is even if you don't select any file and hit submit Codeforces reloads the page again. Wouldn't it be nice to have some pre-check before hitting the server to upload the solution on the client-side? I think that this will reduce the hit count of the server. What do you think about this?