Where can I find past IOI's problems and where to submit them ?! Please help !!!
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Unfortunately, I don't know!
so dont comment
so why are you here?
You can solve IOI's problems ( most of them ) at wcipeg
And you can find problems and solutions here.
Is there something tricky while register at wcipeg?
I write username/password/captcha, click Submit and page refreshs.
There was some errors in login procedure about 12 hrs ago. The problem is fixed now, so I think there will be no problem now.
Thank you very much!
Unfortunately, wcipeg doesn't have some IOI problems.
https://acm.math.spbu.ru/ but you must ask yeputons to register you.