How to solve this kattis problem? It is a multi-source but not once, one by one. You should count the number of vertices with the distance at least k after each source is added. Restarting dijkstra every time is not enough.
Thanks.
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Take advantage of K being small. Maybe incorporate into state somehow?
Define nodes based on two parameters (location, distance from alien base). Run a modified Dijkstra where you find the minimum input id of an alien base that can reach each node. This works because if two alien bases can both reach a town with the same distance D, then for all other nodes reachable from this node, the base with smaller id will always get there earlier.
Srry, I don't understand your solution. Can you describe little bit more about it? Or provide code if you have written it. Thanks.
https://ideone.com/ER1jNn
Thanks, I got it. By the way, isn't there more standard (closer to standard dijkstra) solution?