struct st *And(struct st *A,struct st *B)
{
    struct st *pa,*pb,*C,*pc;
    C=(struct st *)malloc(sizeof(struct st));
    pa=A->next;
    pb=B->next;
    C=pc=A;
   

    while(pa)
    {
        pc->next=pb;
        pc=pb;
        pb=pb->next;
        pa=pa->next;
        pc->next=pa;
        pc=pa;
        

    }

   pc->next=pb;
   return(C);
}
不用排序的 输入1，2，3   4,5,6，输出1,4,2,5,3,6