Running practice contests on PC^2 requires you to have input/output data for each problem. Sometimes this data is not available. valodator allows you to use regular PC^2 with custom external validator which is going to submit submitted problem to online judge and read the verdict.
You need to have valid accounts on online judges and configure valodator accordingly.
- linux or similar unix-like OS (winblows is possible, patches welcome).
- python 2.x with
mechanizeandBeautifulSoup - PC^2 version 9 (or version 8)
On ubuntu you can try something like this
sudo apt-get install python-setuptools
sudo easy_install mechanize
sudo easy_install BeautifulSoup
Instructions shown here are for PC^2 version 9, differences between versions 8 and 9 are minimal.
Modify and copy config file to /etc/ with name valodator.config
sudo cp valodator.config.sample /etc/valodator.config
Since we are using online validator, program does not have to be executed on our computer instead we would like to give it online judge for evaluation.
In the field Execution command line you should put something trivial like
echo. I chose echo since it is mostly harmless and is present on every
unix-like system.
If you want to be adventurous you can try replacing compiler command with
touch {:basename}, this is not recommended since using local compiler
allows us to catch compile errors much easier and faster.
To configure problems follow screenshots shown below.
In short, you don't need to set input/output files and you need to set
external validator to valodator.py. In addition, validator command line
should be set to, for example:
./{:validator} {:mainfile} {:resfile} tju/1001
Don't forget ./ in front.
Last argument is the reference to the problem, it has following format:
<website>/<problem>
Value of <website> can be of following
valodator will work until some change is made on judge website which might cause valodator to stop working suddenly. I will try to fix any upcoming incompatibilities, but without any guarantees.
Try reading logs from logs directory in PC^2 . Also, try reading
executesite1judgeX/valodator_calls.log.
Send description/logs to me and open a new issue on github.
- If you would like to have two computer judges running is parallel,
you need to use different website account for each judge. Otherwise
verdicts will be mixed up.
valodator.configcan be placed inexecutesite1judgeX/instead of/etc/. - Do not use account used by valodator for manual submissions. This may lead to lots of problems.
Using automated bots for submitting problems can violate terms of use of certain online judges. I expect valodator's moderate usage to be for organizing small scale contests 3-7 teams, without flooding the judge server.
Here on github or email: [email protected]