/*************************************************************************
 *  Compilation:  javac DijkstraAllPairsSP.java
 *  Dependencies: EdgeWeightedDigraph.java Dijkstra.java
 *
 *  Dijkstra's algorithm run from each vertex. 
 *  Takes time proportional to E V log V and space proportional to EV.
 *
 *************************************************************************/

public class DijkstraAllPairsSP {
    private DijkstraSP[] all;

    public DijkstraAllPairsSP(EdgeWeightedDigraph G) {
        all  = new DijkstraSP[G.V()];
        for (int v = 0; v < G.V(); v++)
            all[v] = new DijkstraSP(G, v);
    }

    Iterable<DirectedEdge> path(int s, int t) {
        return all[s].pathTo(t);
    }

    double dist(int s, int t) {
        return all[s].distTo(t);
    }
}