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I am surprised this is getting so many downvotes, perhaps the question isn't very clear and seems confusing for people not familiar with the policy based structures.
Overloading std::distance does the trick. See http://codeforces.me/blog/entry/10355?#comment-163713
Thank you for your help. I will try to write clear blogs from next time.
Anywhere I can find good documentations on pbds? I don't know where to learn them and therefore I tend to write my own.
http://codeforces.me/blog/entry/11080 http://codeforces.me/blog/entry/13279