Please, read the Guide to using the Problem set and the Online contest rules.
You may ask questions in the board or by email firstname.lastname@example.org
How to write a solution on my favourite programming language?
You can find the answer in the corresponding section:
I forgot my JUDGE_ID and/or password, how can I find it out?
You can request this information on the Update your info page. JUDGE_ID and password will be sent to the specified email address if any account is registered to this address.
My hard drive is broken, how can I restore my solutions?
In your profile click on the links “Recent submissions”/“Recent accepted submissions” or on the links in the list of solved/unsolved problems. These pages have links to the source codes of your solutions. To download them you need to enter JUDGE_ID and password.
How are the problem difficulty and the author rating calculated?
The problem difficulty is calculated by the formula depending on the number of authors who have solved it and the age of the problem. The fewer new authors solve the problem per unit of time, the greater the difficulty. The difficulties of all problems are updated every night. Author rating is the sum of the difficulties of all his solved problems from the archive.