Guga's Function

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  • + 1 comment

    Did you really have to make MOD as 10^9+9 ? -_-
    Its always 10^9+7, I lost soo much time in that :/

  • + 0 comments

    The answer is . I think this is easy with observation.

  • + 1 comment

    Will a segment be considered as interesting if there is no zero?

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