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  2. 2 Additional Online Test (If Required)
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Problems > No K Ones in a Row > Editorial

No K Ones in a Row — Solution & Editorial

Back to the Problem

State = current trailing run of ones (0..K−1). The transition (append 0 resets the run; append 1 extends it, forbidden at K) is a fixed K×K matrix — exponentiate it.

Complexity: O(K3 log N)