Summer is just about over, and school is around the corner. We hope you had a great summer, and we want to make your school year even greater by kicking off with a new rated contest, Back From Summer '19!

The problem setters for this contest are Ninjaclasher, Zeyu, Beautiful_Times, wleung_bvg, and Pookmeister.

The authors of BFS17 have given us permission to reuse the contest name.

The contest will take place between Sunday, September 1, 9AM EDT and Monday, September 2, 9PM EDT, where participants can participate in any 3 hour window. Once you enter the contest, you will be able to submit until 3 hours from when you started, or until the hard deadline (September 2, 9PM EDT), whichever comes first.

Here are the parameters for the contest:

• Contest duration: 3 hours.
• Number of problems: 6. Each problem will be worth 100 points and have subtasks that offer partial credit. The expected difficulty is similar to the CCC Senior contest.
• Rated for all participants who submit at least once
• Scoreboard will be visible.
• Full Feedback (no clipped output)
• No submission limit.
• Each non-AC (excluding Compiler Errors) submission will have a penalty of 5 minutes towards your submission time for that problem.
• Ties will be broken by the last submission time that increased your score. The first submission time of your highest score will be used.
• Checkers for problems: standard.

Clarification requests for the contest must be routed through the clarification system provided on DMOJ, and not through other channels including but not limited to Slack and Discord.

Due to rampant issues with cheating on contests that has happened recently, any suspicious behavior during the contest window may result in your rating being impacted negatively. Such behavior includes, but is not limited to:

• Registering for the contest with at least two accounts.
• Participating in the contest with an account that is not your primary account.
• During the contest window, talking about the contest in more detail than answering a yes/no question about whether one participated in the contest. This includes, but is not limited to, posting spoilers about the contest and public speculation of the contest.
• Attempting to exploit bugs in the platform to subvert the constraints of the contest.

Punishments may include performance being unrated or, for more serious infractions, being forcibly ranked at the bottom of the scoreboard.

Before the contest date, you may wish to check out the tips and help pages.

After joining the contest, you proceed to the Problems tab to begin. You can also go to Users if you wish to see the rankings.

We have listed below some advice as well as contest strategies:

• Ties will be broken by the last submission time that increased your score. The first submission time of your highest score will be used.
• Remove all extra debugging code and/or input prompts from your code before submitting. The judge is very strict — most of the time, it requires your output to match exactly.
• Do not pause program execution at the end. The judging process is automated. You should use stdin / stdout to perform input / output, respectively. It is guaranteed that all the problems will be solvable with C++.
• Read carefully, and try to attempt all the problems. They may not be as hard as they seem and you may get partial points!

At the end of the contest, you may comment below to appeal a judging verdict. In the case of appeals, the decision(s) of staff is final.