假设有两个按元素非递减次序排列的线性表，均以单链表形式存储。请编写算法将这两个单链表归并为一个按元素值非递减次序排列的单链表，并要求利用原来两个单链表的结点存放归并后的单链表。-Suppose there are two elements in non-descending order according to the linear form, are stored as single linked list. Please write algorithms merge the two into a single list element value by a single non-descending order list, and requested two single linked list using the original storage node after a single merged list.