Is there a way to submit the practice questions?

I am trying to enter to mendo.mk but there is a error in site does any body know about when the site will become normal and we can enter?

I can't find offical websites for BOI and JBOI. I'm wondering where will be BOI and JBOI in 2019? Anybody knows?

Is there a VK cup round 1 on saturday? In calender it looks there will be VK cup round 1 but in contests there won't.

I want to nice problems which has a higher or equal difficulty level (but not too hard like Div.1 D).

Div.2 D Div2.E is fine. Please help me!

Why there isn't any contests for a week?