On [this date](https://www.timeanddate.com/worldclock/fixedtime.html?day=19&month=10&year=2019&hour=14&min=0&sec=0&p1=0) there will be COCI contest in this link: http://hsin.hr/coci/ You can study for the old COCI's here: https://oj.uz/problems/source/122 Also this site has an online judge. And this is another online judge option [Dmoj.ca](https://dmoj.ca/) .It will take three hours.↵
**UPD:** Registration opened.
**UPD:** Registration opened.
