For ones who are not still aware of the currently running specific context by yandex.

http://switchdetect.yandex.ru/en/

What is it? I've tried to participate year ago in similar contest. It resembles TopCoder Marathon, but with 17-gigabytes text file of input data. I was bewildered and annoyed since one pass of tests on the full dataset took several hours on my netbook. And however I am not smart enough in math, I think. Though I believe there are people who may find this contest quite interesting.

Registration is opened till December 15 2012, money prizes assumed.