题目：链表A，每个节点存放一个新的链表B1，B2,B3,B4,B5的头结点。场景：一个年级，相当链表A该年级5个班，每个班5个人，相当于链表B1–B5做一个学生成绩管理系统学生成绩有语文 数学 英语

#include
#include

//该成绩管理系统由双链表嵌套完成，可完成m个班级，每个班级n个学生的成绩管理，输出学生信息，输出最高分、最低分、平均分，m、n由输入获取
struct Class    //班级结构体
{
    char *Class;
    struct Class *next;
    struct Student *Stuhead;
};

struct Student  //学生结构体
{
    char *name;
    int Chinese;
    int Math;
    int English;
    int Sum;
    struct Student *next;
};

struct Class *Chead = NULL;     //定义全局变量，避免太多传参而出错
struct Student *Shead = NULL;

void printStudentMes()      //输出学生信息
{
    struct Class *p1;
    p1 = Chead;
    struct Student *p2 = NULL;
    while(p1!=NULL){        //嵌套
        p2 = p1->Stuhead;
        while(p2!=NULL){
                printf("%s班的%s语文成绩为%d分\n",p1->Class,p2->name,p2->Chinese);
                printf("%s班的%s数学成绩为%d分\n",p1->Class,p2->name,p2->Math);
                printf("%s班的%s英语成绩为%d分\n",p1->Class,p2->name,p2->English);
                printf("%s班的%s总成绩为%d分\n",p1->Class,p2->name,p2->Sum);
                putchar('\n');
                p2 = p2->next;
        }
        p1 = p1->next;
    }
}
struct Student* AddStudentNode(struct Student *head,struct Student *new)  //尾插法创建学生链表
{
    struct Student *p = head;
    if(head==NULL){
            head = new;
            return head;
        }
    while(p->next!=NULL){
            p=p->next;
        }
    p->next = new;
    return head;
}

struct Student *ScanfStudent(struct Student *head,int Students)      //输入学生信息
{
    int j;
    for(j=0;j         struct Student *new = (struct Student*)malloc(sizeof(struct Student));
        new -> name = (struct Student *)malloc(sizeof(struct Student));
        new -> next = NULL;
        printf("请输入学生姓名：\n");
        scanf("%s",new->name);
        printf("请输入学生语文成绩：\n");
        scanf("%d",&(new->Chinese));
        printf("请输入学生数学成绩：\n");
        scanf("%d",&(new->Math));
        printf("请输入学生英语成绩：\n");
        scanf("%d",&(new->English));
        new->Sum = new->Chinese + new->Math + new->English;
        head = AddStudentNode(head,new);
    }
    return head;
}
struct Class* AddClassNode(struct Student *head,struct Student *new)    //增加班级节点
{
    struct Class *p = Chead;
    if(Chead==NULL){
            Chead = new;
            return Chead;
        }
        while(p->next!=NULL){
            p=p->next;
        }
        p->next = new;
        return Chead;

}
struct Class *CreatClass(int Classes,int Students) //创建班级链表
{
    int i;
    for(i=0;i         struct Class *new;
        new = (struct Class*)malloc(sizeof(struct Class));
        new->Class = (struct Class*)malloc(sizeof(struct Class));
        new -> next = NULL;
        new -> Stuhead = NULL;
        printf("请输入班级：\n");
        scanf("%s",new->Class);
        new -> Stuhead = ScanfStudent(Shead,Students);
        Chead = AddClassNode(Chead,new);
    }
    return Chead;
}

int GetSumMax() //求成绩最大值
{
    int Max;
    struct Class *p1;
    p1 = Chead;
    struct Student *p2 = NULL;
    Max = p1-> Stuhead -> Sum;
    while(p1!=NULL){
        p2 = p1->Stuhead;
        while(p2!=NULL){

            if(p2->Sum>Max){
                Max = p2->Sum;
            }
            p2 = p2->next;
        }

        p1 = p1->next;
    }

    return Max;
}

int GetSumMin() //求成绩最小值
{
    int Min;
    struct Class *p1;
    p1 = Chead;
    struct Student *p2 = NULL;
    Min = p1-> Stuhead -> Sum;
    while(p1!=NULL){
        p2 = p1->Stuhead;
        while(p2!=NULL){

            if(p2->Sum                 Min = p2->Sum;
            }
            p2 = p2->next;
        }
        p1 = p1->next;
    }
    return Min;
}

float GetSumAverage(int m,int n)    //注意传参 m为班级，n为学生人数
{
    float total = 0;
    struct Class *p1;
    p1 = Chead;
    struct Student *p2 = NULL;
    while(p1!=NULL){
        p2 = p1->Stuhead;
        while(p2!=NULL){
            total += p2->Sum;
            p2 = p2->next;
        }
        p1 = p1->next;
    }
    return total/(float)(m*n);
}

int main()
{
    int m;
    int n;
    int Max;
    int Min;
    float Average;
    printf("请输入总班级数：\n");
    scanf("%d",&m);
    printf("请输入班级人数：\n");
    scanf("%d",&n);

    CreatClass(m,n);
    Max = GetSumMax();
    Min = GetSumMin();
    Average = GetSumAverage(m,n);
    printStudentMes();
    printf("总分最高的是%d\n总分最低的是:%d\总分平均分是：%f\n",Max ,Min,Average);
    return 0;
}