合并两个链表的程序段 ha和hb分别是两个带表头结点的非递减有序单链表的表头指针, 试设计一个算法, 将这两个有序链表合并成一个非递减有序的单链表。-Merge two lists block ha and hb are the two with a header node non-decreasing order single linked list head pointer, try to design an algorithm, these two ordered lists into