Новосибирск 2016
· contest is over
The system usage rules and the following additional rules apply during contests.
Independent Work and Reference Materials
During the contest, contestants must solve problems independently. Assistance from anyone else, including coaches, is prohibited.
The following are prohibited during the contest:
- publishing contest problems;
- using AI to solve contest problems, including obtaining ideas and hints;
- searching for existing solutions and algorithms.
Documentation for the programming language being used and its standard library is permitted.
Solving Problems and Submitting Solutions
Problems may be solved in any order. They are not necessarily arranged in increasing order of difficulty. Your choice of problem order and how you allocate your time affect your result.
The time when the server receives a submission is used. Submissions received before the contest ends are judged and counted even if judging finishes later.
You may correct and resubmit your solution before the contest ends.
Scoring
- Contestants who solve more problems rank higher.
- When the number of problems solved is equal, contestants with a lower total penalty time rank higher.
- Each solved problem contributes the time from the start of the contest to the first accepted submission, plus 20 minutes for each preceding unsuccessful attempt on that problem.
- Compilation errors do not increase the penalty time.
- Unsolved problems do not contribute to the penalty time. Submissions after an accepted solution do not affect the result.
Penalty Calculation Example
A problem accepted at minute 60 after two unsuccessful attempts contributes 60 + 2 × 20 = 100 minutes to the penalty time.
How Problem Order Affects the Result
A contestant needs 10 minutes to solve an easy problem and 60 minutes to solve a difficult one. Starting with the easy problem leads to accepted submissions at minutes 10 and 70, giving a total penalty time of 80 minutes. Starting with the difficult problem leads to accepted submissions at minutes 60 and 70, giving a total penalty time of 130 minutes. Both orders take 70 minutes to solve both problems, but the choice of order makes a difference of 50 penalty minutes. In this example, every solution is accepted on the first attempt.
Standings
Standings are available during the contest. You can follow your own position and other contestants' results. The number of contestants who have solved each problem helps you assess its difficulty and choose which problem to attempt next.
The standings may be frozen: new results are temporarily hidden from a specified point onward. This keeps the suspense and competition alive until the end of the contest. Submissions are still accepted and judged, and contestants can see the results of their own submissions. Once the standings are unfrozen, they include the results of the hidden submissions.
Questions to the Jury
If you notice a possible error or ambiguity in a problem statement, report it to the jury through the contest messaging system. The jury does not suggest algorithms or correct contestants' solutions. Clarifications relevant to all contestants are published as general announcements.