PushHeap 函数可以过，PopHeap就是不对，我这辈子都是这么写的

typedef struct BNODE
{
	int v,wt,f;
}BNODE;

void PopHeap()
{
	h_len--;
	int i=0,j=1;
	heap[0] = heap[h_len];
	BNODE x = heap[0];
	while (j<h_len)
	{
		if (j+1<h_len && heap[j].f > heap[j+1].f) j++;
		if (x.f <= heap[j].f) break;
		i = j;
		j = i+i+1;
	}
	heap[i] = x;
}