scanf("%d %d",&H->vex_num,&H->arc_num);
printf("vex No. %d;arc No. %d\nInput the vex order\n",H->vex_num,H->arc_num);
for(i=0;i<H->vex_num;i++)
 scanf("%d",&H->vexs[i]);
printf("Input the arc's vertex\n");
for(k=0;k<H->arc_num;k++)
{scanf("%d %d",&i,&j);
 if(i==j) { printf("\ntwo useless vertex's\nInput the arc's vertex\n");  k--;  continue; }
 else
 {for(k=0;k<H->arc_num;k++)
   if(H->vexs[k]==i) { i=k; F++; }
   else if(H->vexs[k]==j) { j=k; F++; }
  if(F>=2) { printf("The vertexs didn't exit\n");  F=0;  k--; continue; }
 if(H->arcs[j][i]==1)
  printf("\nThat arcs has exist!\n");
 else
  {H->arcs[i][j]=H->arcs[j][i]=1;
   Deg[i]++;            
   Deg[j]++;
  }
 F=0;
 }
}
当输入弧是不同的节点号i,j时，程序跑出：The vertexs didn't exit。即F++没有成功执行；而且重复两次后即跳出了for循环。始终没有看的问题所在，大虾们帮忙修改！

scanf("%d %d",&H->vex_num,&H->arc_num);
printf("vex No. %d;arc No. %d\nInput the vex order\n",H->vex_num,H->arc_num);
for(i=0;i<H->vex_num;i++)
scanf("%d",&H->vexs[i]);
printf("Input the arc's vertex\n");
for(k=0;k<H->arc_num;k++)
{scanf("%d %d",&i,&j);
if(i==j) { printf("\ntwo useless vertex's\nInput the arc's vertex\n");  k--;  continue; }
else
{for(k=0;k<H->arc_num;k++)
   if(H->vexs[k]==i) { i=k; F++; }
   else if(H->vexs[k]==j) { j=k; F++; }
  if(F!=2) { printf("The vertexs didn't exit\n");  F=0;  k--; continue; }
if(H->arcs[j][i]==1)
  printf("\nThat arcs has exist!\n");
else
  {H->arcs[i][j]=H->arcs[j][i]=1;
   Deg[i]++;            
   Deg[j]++;
  }
F=0;
}
}
原来的复制错了，重新发一个

明白了，呵呵