On which site can I sign up for an online programming Olympiad (if there is one)?

Question

Programming

Tell me on which site you can sign up for an online programming olympiad (if there is one). Tell me about the Olympiads for schoolchildren, which will be held until the end of summer.

Answer 1

codeforces.ru

Answer 2

acm.timus.su

Answer 3

But is it difficult to fill in a query on Google or is this not taught at school?