I'm trying to improve by solving problems Codeforces, but I'm quite unsure about whether it really helps me improve or not. The question is, the problems I meet are either problems that I can solve in my first sight, or else problems I can't solve in an hour. How to fix this? I'm using the problem difficulty filter but it doesn't work because the actual difficulty for me still varies a lot even in a fixed difficulty number.

For example, if a successful hacking attempt on Div.2 is added to the system test data, will that case be added to Div.1 too?

Only ICPC scoring is available in virtual participation now. So please make Codeforces Scoring an option for virtual participation too.

Several advantages:

1. It will be easier to see one's speed of doing a contest, as speed is far more effective in Codeforces scoring than ICPC.

2. It will be even closer to a real contest.

When I participate Div.2 contests, I always solve the easy problems(such as A, B or C) quickly, but then I can't even move on other problems. What should I do in that case?