1. I have already signed up at MeetQun.com, why would I need to sign up to MeetCoder.com?
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You would need to create a new account at MeetCoder.com. It's our priority to keep both MeetQun.com and MeetCoder.com websites clean and make them as secure as possible.
2. Where is the codes I submitted?
The code you submitted will be stored permanently in the MeetQun OJ system. In the Status page, click on the colum of Language to view "C++/Edit" or "Java/Edit" or "Python/Edit" refering to your submitted code.
3. Is recommended by MeetQun OJ to print something to stdout? How would I debug the code if I could not print to stdout?
Pinting someting to stdout is not recommended. Please stay tuned that a new debugging feature is coming soon to let you refine your code using the MeetQun OJ system.