用C语言编写程序，以单链表为存储结构，对学生成绩进行处理，要求实现如下功能：

（1）随意输入1班至少10人的学号、成绩，将数据按成绩由高到低的顺序保存在一个单链表中；随意输入2班至少10人的学号、成绩，将数据按成绩由高到低的顺序保存在另一个单链表中；

（2）对至少4人的成绩进行修正，输入班级、学号和成绩修正，如+5，-3，-10，+2，但仍要保持数据按成绩由高到低有序；

（3）分别按顺序输出两个班的成绩表。

（4）将两个班的单链表合并成一个单链表，数据仍按成绩由高到低有序；

（5）按成绩由高到低的顺序输出两个班的成绩总表，含班级、学号、成绩信息。

-C language programming, a single-linked list structure for storage, for the performance of their students, call for the following functions : (a) a duty free importation of at least 10 people, the school, achievements, data based on merit is in the order kept in a single-linked list; free importation of two classes of at least 10 people, the school, achievements, data based on merit is in the order of another single-linked list; (2) at least four pairs of accomplishments that, the importation of class, school and accomplishments amendments, such as 5, -3, -10, 2, but they still maintain data based on merit ranking and orderly; (3) the sequence of two classes of output reports. (4) the two classes of single-chain merged into a single table and the data upon results from high to low and orde