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Not mentioned in the problem is that C(N) must be !=0 mod 10^9+7. Otherwize recurrence will not depend on F(0) which can be any.
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You are viewing a single comment's thread. Return to all comments →
Not mentioned in the problem is that C(N) must be !=0 mod 10^9+7. Otherwize recurrence will not depend on F(0) which can be any.