阅读下列C++程序和程序说明,将应填入(n)处的字句写在对应栏内。【说明】[程序6说明]单源最短路径的分支限界算法。const int MAXNUM=29999;include<iostream>include<vector>include<algorithm>include<functional>using namespace std;template <class VertexType,class EdgeType>class MinNode { //程序中使用的最小化堆的结点说明friend class Graph<VertexType,EdgeType>public:MinNode (int nl, EdgeType length1){ VexNum=nl;length=length1;}bool operator>(const MinNode<VertexType,EdgeType>&p)const{ return (1)>p.length;}private:int VexNum;//记录源点序号,序号数组p及distance下标相一致。源点为初始扩展顶点EdgeType length;//记录源点到本顶点的当前最短路径的长度,源点到自身的长度为0}template<class VertexType,classEdgeType>void Graph<VertexType,EdgeType>:: shortestpath(VertexType start) {int j,k,source;//source 记录源点的序号。EdgeType*distance=(2);int*p=new int[MaxNumVertex];vector<MinNode<VertexType,EdgeType> >H;for(source=0;source<MaxNumVertex;source++){ if(NodeList[source]==start)break;}if (source>=MaxNumVertex){cout<<”This is error!”<<end1;return;}MinNode<VertexType,Edge Type>(3);for(k=0;k<MaxNumVertex;k++){ distance[k]:MAXXUM; //记录源点到本顶点k的最终的最短路径的长度p[k]=source; //记录最短路径上的本顶点的直接前驱顶点的序号}distance[source]=0;p[source]=-1;//m 是源点,前一顶点不存在vector<MinNode<VertexType, EdgeType>>::iterator q;while(1){for(j=0;j<MaxNumVertex;j++)if((AdjMatrix[E.VexNum* MaxNumVertex+j]<MAXNUM)&&((4)<distance[j])){ distance[j]=E.length+AdjMatrix[E.VexNum* MaxNumVertex+j];p[j]=E. VexNum; //记录顶点j的前一顶点MinNode<VertexType, EdgeType>(5);H.push_ back(N);push_heap(H. begin(),H.end(),greater<MinNode<VertexType,EdgeType>>());}if(H.empty()=true)break; //若优先队列为空,那么算法结束else{pop_ heap(H.begin(),H. end(),greater<MinNode<VertexType,EdgeType>>());q=H.end()-1; //从最小化堆中取路径最短的顶点E=*q;H.pop_ back(); //删除从最小化堆中“挤”出的顶点}} //end whilefor(k=0;k<MaxNumVertex;k++){cout<<'Shorstest path from vertex'<<k<<'is'<<distance[k]<<end1;j=k;cou

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