结构体是这个：
#define MAXSIZE 11
typedef struct node
{
int dizhi;
int weiquan;
struct node *next;
}NODE,NN[MAXSIZE];
typedef struct
{
int NO;
char name[50];
char xingxi[500];
NODE *head;
}JieDian;
typedef struct
{
JieDian jiedian[MAXSIZE];
int ding;
int bian;
}TU;
TU duqu() //文件读取
{
TU *g;
g=(TU *)malloc(sizeof(TU));
g->bian=0;
g->ding=0;
JieDian *p;
node *q,*t;
FILE *fp;
fp=fopen("tu.txt","rt");
if(fp==NULL)
printf("没能成功打开文件！（文件不存在）\n");
else
{
while(!feof(fp))
{
q=(node *)malloc(sizeof(node));
p=(JieDian *)malloc(sizeof(JieDian));
fscanf(fp,"%d %s:%s",&p->NO,p->name,p->xingxi);
t=q=g->jiedian[g->ding].head;
g->ding++;
do
{
fscanf(fp,"->%d(%dkm) ",&q->dizhi,&q->weiquan);
t=q;
q=q->next;
g->bian++;
}while(q!=NULL);
t->next=NULL;
}
}
printf("\t\t文件中已有%d个顶点，%d条边\n",g->ding,g->bian);
return (*g);
fclose(fp);
}