Most probably, they haven't moved from Java to C++. Java is slightly slower and in many cases, programmers might want to switch to C++ for some particular questions. Also, even if they have shifted, I am curious why you care?

Can't answer for Petr, but as for myself: when I moved to Java I moved because it is much cleaner language where it is harder to make mistake. But with current tools C++ got much better in this regard, and considering you can safely use structures without much time impact (unlike Java where you are frequently stuck with synchronized arrays if you want your solution to run fast)

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