Distinguish between easy medium hard questions CODEFORCES

How to distinguish between easy medium and hard questions at CODEFORCES?
Looking at the problem set they have just put all the questions in the same place , no distinction between
them .All at 1 place .
PLz help 2 distinguish

You can sort the problems in decreasing order i.e most solved will be shown first.
Try this: http://codeforces.com/problemset?order=BY_SOLVED_DESC