编写建立一个由单链表组织存储的整数序列的程序，链表中每个结点存储一个整型数值，以此为基础完成将整数b插入到该链表中第一个数值为a的结点之前的程序。-Prepare a list organized by a single sequence of integers stored procedure, the list stored in each node an integer value as a basis for the completion of the integers b inserted into the list in the first node value is a procedure before .