Multi - Source SSP¶
\(D^k[i][j]\): The shortest distance from the node \(i\) to the node \(j\) cross the node \(l(l \leq k)\).
Updata \(D^k[i][j]\) from \(D^{k-1}[i][j]\) by evaluating:
\[D^k[i][j] = \min \left\{
D^{k-1}[i][j], D^{k-1}[i][k] + D^{k-1}[k][j]
\right\}\]