*Note: You may experience latency issues between your computer and our servers and are therefore advised to submit with an adequate amount of time remaining in your six-minute period.
How We Will Judge Your Submission
1. Minor differences in whitespace are ignored. In particular, every non-empty sequence of whitespace characters (except newlines and non-ASCII characters) is treated as a single space. Unix, Mac and Windows endlines are all acceptable ways of ending lines.
2. Leading and trailing whitespace on each line is ignored. The remaining, non-empty lines are compared pairwise, using rules 1 and 3.
3. Two floating point numbers are considered equal if their absolute or relative difference is smaller than 1e-6, unless the problem statement says otherwise. This does not apply to integers. Two integers are considered equal only when they are exactly equal.
Source Code Submission Rules
You must upload all source code used to solve each input set as part of the submission of your solution. You cannot submit your source code files after the contest. At the end of the contest, any user can view all of the source code submitted. Both the administrators and other contestants should be able to reproduce your output using your source code.
Deliberately obfuscated source code and empty source code files are not allowed. Facebook reserves the right to disqualify any submissions that we believe do not comply with the rules.
After a round, if Facebook discovers that someone submitted source code that doesn't match the submitted output (including if you tell us that your source code doesn't match), Facebook judges will look at that code, look at other code submitted by that user, and determine whether a discrepancy exists. If a discrepancy does exist we will determine whether it is a trivial discrepancy, or a non-trivial discrepancy. If there is no discrepancy, nothing happens. If there is a trivial discrepancy, the contestant will receive five penalty minutes but will keep his or her point for that problem. If there is a non-trivial discrepancy, the contestant will lose credit for that problem.
File Type for Source Code
You must submit plain text or zipped plain text for the source files. The maximum file size that you can upload is 100kB. You can upload multiple files, or you can upload a zipped source code file as long as the contents do not exceed 1MB.
Solving Problems by Hand
If you solve a problem either fully or partly by hand, please submit a text file explaining that you solved the problem by hand. We reserve the right to disqualify any submissions that we believe do not comply with the rules.
Solving problems using methods other than a programming language
If you use specific software to solve a problem, specify this in the file. That software is held to the same restrictions as compilers and interpreters as described above. Also, please provide any input scripts you wrote for the software used (e.g., mathematical software scripts, spreadsheets, etc.).
The program does not necessarily need to produce the output automatically, so it can be interactive. If you wrote an interactive command line script, you should submit all commands used to solve the problem, e.g. a linux command line with awk, Hugs commands, Octave interpreter commands, shell commands, etc.
Solving problems using several programs
If you used several programs to solve a problem, even user-assisted programs, please submit all of the programs.
Solving problems using standard and non-standard libraries
You may use standard libraries, such as Boost, and other open source libraries. If you use a publicly available library, you may submit a link to the library's website rather than including the contents of the library in your source code submission.
You also may use code from non-standard libraries, such as coding libraries from your school's ACM ICPC team, as long as you have a license to use them. You will need to upload all code used in solving each input/output set, whether you are using standard or non-standard libraries. If the source code and the zipped version of the library are larger than 1MB, you may provide a link to the library as long as the library is accessible after the contest.