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Problems > Exactly K Flights > Editorial

Exactly K Flights — Solution & Editorial

Back to the Problem

Min-plus (tropical) matrix power: replace (+, ×) with (min, +); AK under this semiring gives cheapest exactly-K-edge walks. Same binary exponentiation skeleton.

Complexity: O(N3 log K)

Watch out: The identity element is the INF-off-diagonal matrix (0 on the diagonal), not the all-zero matrix.