During long run contest, why can’t you give some hints after some days to solve the hard problems ? If the idea seems to unethical , please comment why. Just a suggestion. I believe that there will be more interest if we are able to solve the problems using hints rather than reading the editorial.
Anyway ranking is not a matter in these contests, and if clues(only for hard problems) are given after few days.
I think more users will try to solve the problem during contests. It will increase the interest among coders too. It would be a great opportunity to learn.