for (i = 2; i <= num*(num - 1); i++)
    {
        if (distance[i - 1].distance < distance[i].distance)
        {
            int temp=0;
            distance[temp] = distance[i];
            for (j = i - 1; distance[temp].distance < distance[j].distance; j--)
            {
                distance[j] = distance[j + 1];
                distance[j + 1] = distance[temp];
                distance[temp] = distance[j];
            }
               
        }
    }

怎么让他从大到小排序