I think voting system (voting easy, medium, hard, and extreme) is not good.
Because:
1. If it has a very easy problem (difficulty=1%, like Hello World Problem) and not very easy but easy (difficulty=about 4-5%), and if every person think "it is near by easy than medium" for the second problem, this problem's difficulty will be 1%.
2. In the new problem, the number of voters is a little, so if every (or one) person think "it is easy", so the difficulty will be 1%.
So the problem's difficulty in the current system is not comparable and I think some difficulty=1% problem is not easy.
You should change the voting system and I think 4 classes (easy, medium, hard, extreme) -> about 20 classes is better.
