What is the complexity of dijkstra algorithm but without the vis array and without checking for dist array code https://ideone.com/VTaE03
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What's the meaning of
kin the code?It can be quadratic, for example this directed graph:
Initial node is connected with k nodes (with cost 1), these k nodes are connected with another node (middle)(with costs k, k — 1 , k — 2..., 1). Middle node is connected with another k nodes (with cost 1), which are connected to the final node (with cost oo, a.k.a. big enough).
Certainly middle node will be visited k times, and visiting it requires k operations, as it has k neighbours. So total complexity would be at least
.
If I understood the code correctly it wouldn't be difficult to construct O(2n) in a similar way.