（ljjz.h）邻接矩阵

#include<stdio.h>
#include<malloc.h>
#include<stdlib.h>
#define FINITY 50000
#define M 20
typedef char vertextype;
typedef int edgetype;
typedef struct
{
    vertextype vexs[M];//定点信息
    edgetype edges[M][M];//邻接矩阵
    int n,e;//顶点总数，边总数
}Mgraph;
void creat(Mgraph *g,char *s,int c)
{
    int i,j,k,w;
    FILE *rf;//从文件输入图数据
    rf=fopen(s,"r");
    if(rf)
    {
        fscanf(rf,"%d%d",&g->n,&g->e);//读入顶点数，边数
        for(i=0;i                                                                                                                                              <g->n;i++)
            fscanf(rf,"%1s",&g->vexs[i]);//读入顶点值
        for(i=0;i<g->n;i++)//初始化邻接矩阵
            for(j=0;j<g->n;j++)
            if(i==j)
            g->edges[i][j]=0;
            else g->edges[i][j]=FINITY;
        for(k=0;k<g->e;k++)//读入边
        {

            fscanf(rf,"%d%d%d",&i,&j,&w);
            printf("%d %d %d
",i,j,w);
            g->edges[i][j]=w;
            if(c==0)//如果是无向图则对应j，i相等
                g->edges[j][i]=w;
        }
        fclose(rf);
    }
    else g->n=0;
}