用c++写一个兔子拔萝卜、吃萝卜的类，类中用vector输入输出吃萝卜和拔萝卜的数量，再写一个萝卜的类，用来记数萝卜的数量

以下是用C++编写的兔子和萝卜类，实现兔子拔萝卜、吃萝卜和萝卜数量的记录功能。其中，兔子类中使用vector来记录吃萝卜和拔萝卜的数量，萝卜类中使用静态成员变量来记录萝卜的数量。

#include <iostream>
#include <vector>

using namespace std;

class Carrot {
public:
    static int count;  // 记录萝卜数量的静态成员变量
    Carrot() { count++; }  // 构造函数，每次创建对象时数量加一
    ~Carrot() { count--; }  // 析构函数，每次销毁对象时数量减一
};

int Carrot::count = 0;

class Rabbit {
public:
    Rabbit() {}
    void eat(int n) { carrots_eaten.push_back(n); }  // 记录吃萝卜的数量
    void pull(int n) { carrots_pulled.push_back(n); }  // 记录拔萝卜的数量
    void print() {  // 输出吃萝卜和拔萝卜的数量
        cout << "I have eaten " << carrots_eaten.size() << " carrots:" << endl;
        for (int i : carrots_eaten) {
            cout << i << " ";
        }
        cout << endl;
        cout << "I have pulled " << carrots_pulled.size() << " carrots:" << endl;
        for (int i : carrots_pulled) {
            cout << i << " ";
        }
        cout << endl;
    }
private:
    vector<int> carrots_eaten;  // 记录吃萝卜的数量的vector
    vector<int> carrots_pulled;  // 记录拔萝卜的数量的vector
};

int main() {
    Rabbit rabbit;
    Carrot c1, c2, c3;
    rabbit.eat(2);
    rabbit.pull(1);
    rabbit.eat(3);
    rabbit.print();
    cout << "There are " << Carrot::count << " carrots." << endl;
    return 0;
}

输出结果为：

I have eaten 2 carrots:
2 3 
I have pulled 1 carrots:
1 
There are 3 carrots.