I found the official site of "Looking for a challenge" (http://www.lookingforachallengethebook.com/) updated and now the site has order form. I really want the book, so I ordered one.But unfortunately, there have been no response.
Does anyone get the book ordered by the form, or receive any response?
UPD: On 23rd May, I got a response!
UPD: I couldn't get the book; so I asked the IOI team leader of Japan to get some copies directly from Poland Team. Fortunately, because the trouble was transportation, I got a copy.