// 广度优先遍历.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <list>
using namespace std;
#define MAXVEX 10
#define INFINITY 65535
typedef struct
{
	char vexs[MAXVEX];
	int arc[MAXVEX][MAXVEX];
	int numVertexes;
	int numEdges;
}MGraph;//图的数据结构，邻接矩阵
void CreateMGraph(MGraph *pGraph,int &numVexs,int &numEdges)
{
	pGraph->numEdges=numEdges;
	pGraph->numVertexes=numVexs;
	for(int i=0;i<numVexs;i++)
	{
		cout<<"输入第"<<i+1<<"个顶点:";
		cin>>pGraph->vexs[i];
	}
	for(int i=0;i<numVexs;i++)
	{
		for(int j=0;j<numVexs;j++)
			pGraph->arc[i][j]=INFINITY;
	}
	for(int i=0;i<numEdges;i++)
	{
		int j,k;
		cout<<"请输入第"<<i+1<<"条边的下标:";
		cin>>j>>k;
		pGraph->arc[j][k]=1;
		pGraph->arc[k][j]=1;
	}
}
void BFSTravers(MGraph &pGraph)
{
	int num=pGraph.numVertexes;
	list<int> queue;
	bool *visited=new bool[num];
	for(int i=0;i<num;i++)
		visited[i]=false;
	for(int i=0;i<pGraph.numVertexes;i++)
	{
		if(!visited[i])
		{
			cout<<"访问顶点"<<pGraph.vexs[i]<<endl;
			visited[i]=true;
			queue.push_back(i);
			while(!queue.empty())
			{
				i=queue.front();
				queue.pop_front();
				for(int j=0;j<pGraph.numVertexes;j++)
				{
					if(pGraph.arc[i][j]==1&&!visited[j])
					{
						cout<<"访问顶点"<<pGraph.vexs[j]<<endl;
						visited[j]=true;
						queue.push_back(j);
					}
				}
			}
		}
	}
	delete []visited;
}
int _tmain(int argc, _TCHAR* argv[])
{
	MGraph graph;
	int numVex;
	int numEdge;
	cout<<"输入图的顶点数：";
	cin>>numVex;
	cout<<"输入图的边数：";
	cin>>numEdge;
	CreateMGraph(&graph,numVex,numEdge);
	BFSTravers(graph);
	system("pause");
	return 0;
}