Floyd-Warshall算法描述
1)适用范围：
a)APSP(All Pairs Shortest Paths)
b)稠密图效果最佳
c)边权可正可负
2)算法描述：
a)初始化：dis[u,v]=w[u,v]
b)For k:=1 to n
For i:=1 to n
For j:=1 to n
If dis[i,j]>dis[i,k]+dis[k,j] Then
Dis[I,j]:=dis[I,k]+dis[k,j]
c)算法结束：dis即为所有点对的最短路径矩阵
3)算法小 ...
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