Lithuania is hosting its final content this weekend (1st and 2nd of April). And they have an online contest where students can participate (senior division).
The only supported language is C++. CMS will be used as the contest system.
The First round of the Competition will take place on Saturday, April 1st, starting at 8:00 UTC. The Second round will take place the next day, on Sunday, April 2nd, starting at 8:00 UTC. There will be 3 tasks each day and the contest will be 5 hours long.
Registration link, further info will be available at http://online.lmio.lt/