void split(node*&H,node*& H1, node*& H2) {
	node* p1,* p2;
	bool if_swapped = false;
	Add(H1, 0);
	Add(H2, 0);
	p1 = H1;
	p2 = H2;
	while (H) {
		if (if_swapped) {
			p2->next = H;
			p2 = p2->next;
		}
		else {
			p1->next = H;
			p1 = p1->next;
		}
		H = H->next;
		if_swapped = !if_swapped;
	}
	p1->next = p2->next = NULL;
	Del_1(H1);
	Del_1(H2);
}