4．　　假设有两个按数据元素值非递减有序排列的线性表A和B，均以单链表作为存储结构。编写算法将A表和B表归并成一个按元素值递减有序（即非递增有序，允许值相同）排列的线性表C。-4. Assuming there are two data elements according to the value of non-decreasing in an orderly array of linear forms A and B, are single-linked list as a storage structure. A table prepared algorithm and B merge into a table element values by diminishing orderly (ie non-incremental and orderly, allowing the same value) with the linear form C.