typedef struct node{
	char *key;
	struct node* lchild;
	struct node* rchild;
	int count;
	struct node()
	{
		key = NULL;
		count = 1;
		lchild = NULL;
		rchild = NULL;
	}
}bstnode;
这是我定义的结构体，帮忙看看这个很用内存的吗 ？