Bellman-Ford算法关键之处在于：只有那些在前一遍松弛中改变了最短路程估计值的顶点，才能引起它们邻接点最短路程估计值发生改变。-Bellman-Ford algorithm that crucial point: Only those former slack again changed the vertex shortest distance estimates, causing their neighbors to the shortest distance estimates ch

Least Slack Time Code Java code