根据上述问题和要求，用C++编写完整代码

好的，以下是一个简单的 C++ 实现，仅供参考。

#include <iostream>
#include <string>
#include <vector>
using namespace std;

// 本科生节点
struct Undergraduate {
    string name;    // 姓名
    string classs;  // 班级
};

// 研究生节点
struct Graduate {
    string name;    // 姓名
    string classs;  // 班级
    vector<Undergraduate> undergraduates;    // 本科生列表
};

// 导师节点
struct Teacher {
    string name;    // 姓名
    string title;   // 职称
    vector<Graduate> graduates; // 研究生列表
    vector<Undergraduate> undergraduates;    // 本科生列表
};

// 导师广义表
vector<Teacher> teacherList;

// 查找导师节点
int findTeacher(string name) {
    for (int i = 0; i < teacherList.size(); i++) {
        if (teacherList[i].name == name) {
            return i;
        }
    }
    return -1;
}

// 插入本科生节点
bool insertUndergraduate(string teacherName, Undergraduate undergraduate) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        teacherList[index].undergraduates.push_back(undergraduate);
        return true;
    }
    return false;
}

// 插入研究生节点
bool insertGraduate(string teacherName, string graduateName, Graduate graduate) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        for (int i = 0; i < teacherList[index].graduates.size(); i++) {
            if (teacherList[index].graduates[i].name == graduateName) {
                teacherList[index].graduates[i].undergraduates.push_back(graduate.undergraduates[0]);
                return true;
            }
        }
        graduate.undergraduates.clear();
        teacherList[index].graduates.push_back(graduate);
        return true;
    }
    return false;
}

// 删除本科生节点
bool deleteUndergraduate(string teacherName, string undergraduateName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        for (int i = 0; i < teacherList[index].undergraduates.size(); i++) {
            if (teacherList[index].undergraduates[i].name == undergraduateName) {
                teacherList[index].undergraduates.erase(teacherList[index].undergraduates.begin() + i);
                return true;
            }
        }
    }
    return false;
}

// 删除研究生节点
bool deleteGraduate(string teacherName, string graduateName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        for (int i = 0; i < teacherList[index].graduates.size(); i++) {
            if (teacherList[index].graduates[i].name == graduateName) {
                teacherList[index].graduates.erase(teacherList[index].graduates.begin() + i);
                return true;
            }
        }
    }
    return false;
}

// 查询导师信息
void queryTeacher(string teacherName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        cout << "姓名：" << teacherList[index].name << endl;
        cout << "职称：" << teacherList[index].title << endl;
    }
}

// 查询本科生信息
void queryUndergraduate(string teacherName, string undergraduateName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        for (int i = 0; i < teacherList[index].undergraduates.size(); i++) {
            if (teacherList[index].undergraduates[i].name == undergraduateName) {
                cout << "姓名：" << teacherList[index].undergraduates[i].name << endl;
                cout << "班级：" << teacherList[index].undergraduates[i].classs << endl;
            }
        }
    }
}

// 查询研究生信息
void queryGraduate(string teacherName, string graduateName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        for (int i = 0; i < teacherList[index].graduates.size(); i++) {
            if (teacherList[index].graduates[i].name == graduateName) {
                cout << "姓名：" << teacherList[index].graduates[i].name << endl;
                cout << "班级：" << teacherList[index].graduates[i].classs << endl;
            }
        }
    }
}

// 统计研究生和本科生数量
void countStudent(string teacherName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        int graduateCount = teacherList[index].graduates.size();
        int undergraduateCount = teacherList[index].undergraduates.size();
        cout << "研究生数量：" << graduateCount << endl;
        cout << "本科生数量：" << undergraduateCount << endl;
    }
}

// 打印导师的学生列表
void printStudent(string teacherName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        cout << "研究生列表：" << endl;
        for (int i = 0; i < teacherList[index].graduates.size(); i++) {
            cout << "    姓名：" << teacherList[index].graduates[i].name << endl;
            cout << "    班级：" << teacherList[index].graduates[i].classs << endl;
            cout << "    本科生列表：" << endl;
            for (int j = 0; j < teacherList[index].graduates[i].undergraduates.size(); j++) {
                cout << "        姓名：" << teacherList[index].graduates[i].undergraduates[j].name << endl;
                cout << "        班级：" << teacherList[index].graduates[i].undergraduates[j].classs << endl;
            }
        }
        cout << "本科生列表：" << endl;
        for (int i = 0; i < teacherList[index].undergraduates.size(); i++) {
            cout << "    姓名：" << teacherList[index].undergraduates[i].name << endl;
            cout << "    班级：" << teacherList[index].undergraduates[i].classs << endl;
        }
    }
}

// 主函数
int main() {
    while (true) {
        int choice;
        cout << "请选择操作：" << endl;
        cout << "1. 建立导师广义表" << endl;
        cout << "2. 插入本科生节点" << endl;
        cout << "3. 插入研究生节点" << endl;
        cout << "4. 删除本科生节点" << endl;
        cout << "5. 删除研究生节点" << endl;
        cout << "6. 查询导师信息" << endl;
        cout << "7. 查询本科生信息" << endl;
        cout << "8. 查询研究生信息" << endl;
        cout << "9. 统计研究生和本科生数量" << endl;
        cout << "10. 打印导师的学生列表" << endl;
        cout << "11. 退出程序" << endl;
        cin >> choice;
        if (choice == 1) {
            Teacher teacher;
            cout << "请输入导师姓名：";
            cin >> teacher.name;
            cout << "请输入导师职称：";
            cin >> teacher.title;
            teacherList.push_back(teacher);
        }
        else if (choice == 2) {
            string teacherName;
            Undergraduate undergraduate;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入本科生姓名：";
            cin >> undergraduate.name;
            cout << "请输入本科生班级：";
            cin >> undergraduate.classs;
            if (!insertUndergraduate(teacherName, undergraduate)) {
                cout << "导师不存在！" << endl;
            }
        }
        else if (choice == 3) {
            string teacherName, graduateName;
            Graduate graduate;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入研究生姓名：";
            cin >> graduateName;
            cout << "请输入研究生班级：";
            cin >> graduate.classs;
            cout << "请输入本科生姓名：";
            cin >> graduate.undergraduates[0].name;
            cout << "请输入本科生班级：";
            cin >> graduate.undergraduates[0].classs;
            if (!insertGraduate(teacherName, graduateName, graduate)) {
                cout << "导师不存在！" << endl;
            }
        }
        else if (choice == 4) {
            string teacherName, undergraduateName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入本科生姓名：";
            cin >> undergraduateName;
            if (!deleteUndergraduate(teacherName, undergraduateName)) {
                cout << "导师或本科生不存在！" << endl;
            }
        }
        else if (choice == 5) {
            string teacherName, graduateName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入研究生姓名：";
            cin >> graduateName;
            if (!deleteGraduate(teacherName, graduateName)) {
                cout << "导师或研究生不存在！" << endl;
            }
        }
        else if (choice == 6) {
            string teacherName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            queryTeacher(teacherName);
        }
        else if (choice == 7) {
            string teacherName, undergraduateName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入本科生姓名：";
            cin >> undergraduateName;
            queryUndergraduate(teacherName, undergraduateName);
        }
        else if (choice == 8) {
            string teacherName, graduateName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入研究生姓名：";
            cin >> graduateName;
            queryGraduate(teacherName, graduateName);
        }
        else if (choice == 9) {
            string teacherName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            countStudent(teacherName);
        }
        else if (choice == 10) {
            string teacherName;
            cout << "请输入导师姓名