通過只調整指標（而不是資料）來交換兩個相鄰的元素

//3.3 a.單鏈表
void OneListSwapByAdd(ElemType B, ElemType C, List L) {
	Position a_pos, b_pos, c_pos;
	b_pos = Find(B, L);
	c_pos = Find(C, L);
	a_pos = FindPrevious(B, L);
	Position Tmp = (List)malloc(sizeof(Node));
	Tmp->next = a_pos->next;
	a_pos->next = b_pos->next;
	b_pos->next = c_pos->next;
	c_pos->next = Tmp->next;
}

//3.3 b.雙鏈表
void TwoListSwapByAdd(ElemType X1, List L, ElemType X2, List P) {
	List Tmp = (List)malloc(sizeof(Node));
	List a1, b1, a2, b2;
	a1 = FindPrevious(X1, L);
	a2 = FindPrevious(X2, P);
	b1 = Find(X1, L);
	b2 = Find(X2, P);

	Tmp->next = b1->next;
	b1->next = b2->next;
	a2->next = b1;
	b2->next = Tmp->next;
	a1->next = b2;
}
 

int main()
{
	List L,P;
	ElemType a, b;
	L = CreatedList();
	P = CreatedList();
	PrintList(L);
	PrintList(P);
	printf("請輸入需要交換的兩個數：");
	scanf_s("%d%d", &a, &b);
	TwoListSwapByAdd(a, L, b, P);
	PrintList(L);
	PrintList(P);
    return 0;
}