最小生成树的普里姆算法PrimTree；在一个连通网的所有生成树中，各边的权值之和最小的那棵生成树称为该连通网的最小代价生成树（Minimum Cost Spanning Tree），简称为最小生成树。 -Prim minimum spanning tree algorithm in all spanning a communication network, the weight of each side and a minimum spanning tree is called the