Yandex Analyst interview questions

I got a call from HR suggesting to fill the form at the site's vacancies zone. Then I was invited to technical 1.5 hour interview with specialists. We talked about how to create a search engine, how search engines work an so on. Then I got a problem to solve at home with a week limit (to apply some machine learning algorithm). Then I was invited to another interview with not only technical specialists but also team managers and head of the department. There were some quite simple questions and some tricky questions with multiple ways to solve they expected to hear.