Problem B: 一帮学生

骑猪看日落 2022-06-17 01:21 101阅读 0赞

## Problem B: 一帮学生 ##

Time Limit: 1 Sec   Memory Limit: 128 MB  
Submit: 788   Solved: 427  
\[ [Submit][]\]\[ [Status][]\]\[ [Web Board][]\]

## Description ##

学生Student类是Person类的子类，而且每个人都有生日，生日是Date类的对象。所以，需要定义如下类：

1. Date类：拥有年、月、日三个int类型的属性。

2. Person类：有一个Date类型对象的属性（表示生日）、string类型属性（表示名字），以及一个int类型的静态属性numOfPersons（对象个数）。

3. Student类：是Person类的子类，并拥有一个int类型属性（表明学生学号），一个int类型的静态属性numOfStudents（对象个数）。  
定义上述类的构造、析构函数，并根据样例输出格式输出相应的信息。

## Input ##

第一行整数N>0表示之后有N行输入。

之后的N行，每行包括4个整数、1个字符串，分别表示年、月、日、学号和姓名。

## Output ##

见样例~

## Sample Input ##

32010 3 4 1 Tom2010 3 5 2 Jack2010 3 6 3 Mary

## Sample Output ##

Date 2010-3-4 is created.The 1th person Tom whose birthday is 2010-3-4 is created.The 1th student Tom whose birthday is 2010-3-4 and id is 1 is created.Date 2010-3-5 is created.The 2th person Jack whose birthday is 2010-3-5 is created.The 2th student Jack whose birthday is 2010-3-5 and id is 2 is created.Date 2010-3-6 is created.The 3th person Mary whose birthday is 2010-3-6 is created.The 3th student Mary whose birthday is 2010-3-6 and id is 3 is created.Student Tom whose birthday is 2010-3-4 and id is 1 is erased.Person Tom whose birthday is 2010-3-4 is erased.Date 2010-3-4 is erased.Student Jack whose birthday is 2010-3-5 and id is 2 is erased.Person Jack whose birthday is 2010-3-5 is erased.Date 2010-3-5 is erased.Student Mary whose birthday is 2010-3-6 and id is 3 is erased.Person Mary whose birthday is 2010-3-6 is erased.Date 2010-3-6 is erased.

## HINT ##

## Append Code ##

[append.cc][],

#include <iostream>
    #include <algorithm>
    
    using namespace std;
    
    class Date
    {
    public:
        int year,month,date;
        Date(int year,int month,int date):year(year),month(month),date(date){cout<<"Date "<<year<<"-"<<month<<"-"<<date<<" is created."<<endl;}
        ~Date(){cout<<"Date "<<year<<"-"<<month<<"-"<<date<<" is erased."<<endl;}
    };
    class Person
    {
    public:
        Date birthday;
        string name;
        static int numOfPersons;
        Person(int year,int month,int date,string _name):birthday(year,month,date)
            {
                name = _name;
                numOfPersons++;
                cout<<"The "<<numOfPersons<<"th person "<<name<<" whose birthday is "<<year<<"-"<<month<<"-"<<date<<" is created."<<endl;
            }
            ~Person(){cout<<"Person "<<name<<" whose birthday is "<<birthday.year<<"-"<<birthday.month<<"-"<<birthday.date<<" is erased."<<endl;}
    };
    int Person::numOfPersons = 0;
    class Student : public Person
    {
    public:
        static int numOfStudents;
        int num;
        Student(int year,int month,int date,string name,int _num):Person(year,month,date,name)
        {
            num = _num;
            numOfStudents++;
            cout<<"The "<<numOfPersons<<"th student "<<name<<" whose birthday is "<<year<<"-"<<month<<"-"<<date<<" and id is "<<num<<" is created."<<endl;
        }
        ~Student(){cout<<"Student "<<name<<" whose birthday is "<<birthday.year<<"-"<<birthday.month<<"-"<<birthday.date<<" and id is "<<num<<" is erased."<<endl;}
    };
    int Student::numOfStudents = 0;
    int main()
    {
        int year, month, day, id, i;
        string name;
        int num;
        cin>>num;
        Student **students = new Student*[num];
        for (i = 0; i < num; i++)
        {
            cin>>year>>month>>day>>id>>name;
            students[i] = new Student(year, month, day, name, id);
        }
        for (i = 0;i <num; i++)
            delete students[i];
        delete[] students;
        return 0;
    }

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[append.cc]: http://219.218.128.149/JudgeOnline/append_detail.php?lang=1&pid=2058&getkey=