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Did you really have to make MOD as 10^9+9 ? -_- Its always 10^9+7, I lost soo much time in that :/
The answer is . I think this is easy with observation.
Will a segment be considered as interesting if there is no zero?
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Did you really have to make MOD as 10^9+9 ? -_-
Its always 10^9+7, I lost soo much time in that :/
The answer is . I think this is easy with observation.
Will a segment be considered as interesting if there is no zero?