请设计日期类Date，用于存储年月日。请设计人类Person，用于存储姓名Name和出生日期Birth和离家日期Leave。请设计人群类Persons，用于存储多个人对象的指针。 输入n+1行，第1行是正整数n（n<10），第2行至第n+1行，每行是姓名和出生日期（年月日）和离家日期（年月日）。 输出7n+2行，表达了n个对象的构造与析构的过程。 前3n行中，每3行表示了一个人类对象的构造过程。 之后的n行中，每1行是一个人类对象的输出。 之后的3n行中，每3行是一个人类对象的析构过程。

好的，我理解了你的要求。以下是代码实现：

#include <iostream>
#include <string>

using namespace std;

class Date {
private:
    int year, month, day;
public:
    Date(int y, int m, int d) {
        year = y;
        month = m;
        day = d;
        cout << "Constructed a Date object with year = " << year << ", month = " << month << ", day = " << day << endl;
    }
    ~Date() {
        cout << "Destructed a Date object with year = " << year << ", month = " << month << ", day = " << day << endl;
    }
};

class Name {
private:
    string first, last;
public:
    Name(string f, string l) {
        first = f;
        last = l;
        cout << "Constructed a Name object with first name = " << first << ", last name = " << last << endl;
    }
    ~Name() {
        cout << "Destructed a Name object with first name = " << first << ", last name = " << last << endl;
    }
};

class Person {
private:
    Name *name;
    Date *birth, *leave;
public:
    Person(Name *n, Date *b, Date *l) {
        name = n;
        birth = b;
        leave = l;
        cout << "Constructed a Person object with name = " << name->first << " " << name->last << ", birth date = " << birth->year << "/" << birth->month << "/" << birth->day << ", leave date = " << leave->year << "/" << leave->month << "/" << leave->day << endl;
    }
    ~Person() {
        cout << "Destructed a Person object with name = " << name->first << " " << name->last << ", birth date = " << birth->year << "/" << birth->month << "/" << birth->day << ", leave date = " << leave->year << "/" << leave->month << "/" << leave->day << endl;
        delete name;
        delete birth;
        delete leave;
    }
};

class Persons {
private:
    Person **people;
    int size;
public:
    Persons(int n) {
        size = n;
        people = new Person*[size];
        cout << "Constructed a Persons object with size = " << size << endl;
    }
    ~Persons() {
        cout << "Destructed a Persons object with size = " << size << endl;
        for (int i = 0; i < size; i++) {
            delete people[i];
        }
        delete[] people;
    }
    void addPerson(Name *n, Date *b, Date *l, int index) {
        people[index] = new Person(n, b, l);
    }
    Person* getPerson(int index) {
        return people[index];
    }
};

int main() {
    int n;
    cin >> n;

    Persons *group = new Persons(n);

    for (int i = 0; i < n; i++) {
        string first, last;
        int byear, bmonth, bday, lyear, lmonth, lday;
        cin >> first >> last >> byear >> bmonth >> bday >> lyear >> lmonth >> lday;

        Name *name = new Name(first, last);
        Date *birth = new Date(byear, bmonth, bday);
        Date *leave = new Date(lyear, lmonth, lday);

        group->addPerson(name, birth, leave, i);
        cout << endl;
    }

    for (int i = 0; i < n; i++) {
        Person *p = group->getPerson(i);
        cout << "Person " << i+1 << ": " << p->getFirstName() << " " << p->getLastName() << ", born on " << p->getBirthYear() << "/" << p->getBirthMonth() << "/" << p->getBirthDay() << ", left home on " << p->getLeaveYear() << "/" << p->getLeaveMonth() << "/" << p->getLeaveDay() << endl;
        cout << endl;
    }

    delete group;

    return 0;
}

需要注意的是，由于题目要求输出对象的构造和析构过程，因此需要在Date、Name、Person和Persons类中分别添加构造函数和析构函数，并在其中输出相关信息。另外，由于Person类中使用了指针，因此需要在析构函数中手动释放内存。

在main函数中，我们首先读入人群数量n，并创建一个Persons对象。接着，循环n次，每次读入一个人的信息，创建一个Name对象、一个Birth对象和一个Leave对象，并将这些指针传递给Person对象，将Person对象指针存储在Persons对象中。最后，循环n次，输出每个Person对象的信息。最后，释放Persons对象的内存。

希望这个代码可以帮到你！