建立一个简单的学校人员管理系统，包括对学生、员工和在职学生（既是员工又是学生）的管理。需要完成如下功能： 1、建立一个School类,在其中定义增加人员的Append函数。 2、建立一个基类Person类，要具有姓名和性别的属性，并把输出函数ShowMe()定义为虚函数； 3、建立一个员工Staff类和一个学生类Student，均由Person继承而来。要求可以输出员工类（学生类）对象的属性（姓名、性别和工作证号码（或学生学号），分别写出对ShowMe()函数的具体实现。 4、建立一个在职学生类Staff_Student类，由员工类和学生类继承而来。写出对ShowMe()函数的具体实现，可以输出对象属性，。 5、重载，实现用cin为员工类、学生类和在职学生类对象赋值。 6、编写main（）主函数，测试上述功能。

好的，我会根据您的要求为您设计一个学校人员管理系统，以下是代码实现：

#include <iostream>
#include <string>
#include <vector>

using namespace std;

class Person {
private:
    string name;
    string gender;
public:
    Person(string n, string g) : name(n), gender(g) {}
    virtual void ShowMe() {
        cout << "Name: " << name << endl;
        cout << "Gender: " << gender << endl;
    }
};

class Staff : public Person {
private:
    string work_id;
public:
    Staff(string n, string g, string w) : Person(n, g), work_id(w) {}
    void ShowMe() {
        Person::ShowMe();
        cout << "Work ID: " << work_id << endl;
    }
    friend istream& operator>>(istream& in, Staff& s) {
        cout << "Please input staff's name:";
        in >> s.name;
        cout << "Please input staff's gender:";
        in >> s.gender;
        cout << "Please input staff's work ID:";
        in >> s.work_id;
        return in;
    }
};

class Student : public Person {
private:
    string stu_id;
public:
    Student(string n, string g, string s) : Person(n, g), stu_id(s) {}
    void ShowMe() {
        Person::ShowMe();
        cout << "Student ID: " << stu_id << endl;
    }
    friend istream& operator>>(istream& in, Student& s) {
        cout << "Please input student's name:";
        in >> s.name;
        cout << "Please input student's gender:";
        in >> s.gender;
        cout << "Please input student's student ID:";
        in >> s.stu_id;
        return in;
    }
};

class Staff_Student : public Staff, public Student {
public:
    Staff_Student(string n, string g, string w, string s) : Staff(n, g, w), Student(n, g, s) {}
    void ShowMe() {
        Person::ShowMe();
        cout << "Work ID: " << Staff::work_id << endl;
        cout << "Student ID: " << Student::stu_id << endl;
    }
    friend istream& operator>>(istream& in, Staff_Student& ss) {
        cout << "Please input staff-student's name:";
        in >> ss.name;
        cout << "Please input staff-student's gender:";
        in >> ss.gender;
        cout << "Please input staff-student's work ID:";
        in >> ss.work_id;
        cout << "Please input staff-student's student ID:";
        in >> ss.stu_id;
        return in;
    }
};

class School {
private:
    vector<Person*> people;
public:
    void Append(Person* p) {
        people.push_back(p);
    }
    void ShowAll() {
        for (auto p : people) {
            p->ShowMe();
        }
    }
};

int main() {
    School school;
    int n;
    cout << "Please input the number of staffs, students and staff-students:";
    cin >> n;
    for (int i = 1; i <= n; i++) {
        int type;
        cout << "Please input the type of person (1 for staff, 2 for student, 3 for staff-student):";
        cin >> type;
        switch (type) {
            case 1: {
                auto s = new Staff("", "", "");
                cin >> *s;
                school.Append(s);
                break;
            }
            case 2: {
                auto s = new Student("", "", "");
                cin >> *s;
                school.Append(s);
                break;
            }
            case 3: {
                auto s = new Staff_Student("", "", "", "");
                cin >> *s;
                school.Append(s);
                break;
            }
        }
    }
    school.ShowAll();
    return 0;
}

这个程序实现了一个学校人员管理系统，可以添加员工、学生和在职学生，并可以输出这些人员的属性。同时，程序中还重载了输入运算符，可以通过cin为对象赋值。运行程序后，会先要求输入需要添加的员工、学生和在职学生的数量，然后逐个输入每个人员的信息，最后输出所有人员的属性。