Hello.
I am happy to introduce New Website named UpSolve .
Features :
1. comment section
2. show all unsolved problems of some rate
3. creating contests (random and custom problems) (random is only for CF)
4. a unique url for every contest that you can see your result's in that url
5. supporting AtCoder & CodeForces
Todo :
1. adding more oj's (codechef, spoj, ...)
2. add random for atcoder
Thanks :
1. mike for providing codeforces and api.
2. kenkoooo.com for providing atcoder api.
Notes :
1. as sometimes codeforces or atcoder api are slow please wait.