写一个兔子拔萝卜吃萝卜的C++程序，它包含两个类：兔子类和萝卜类。萝卜类有一个静态公有的数量变量，并且使用vector容器来存储。兔子类嵌套了萝卜数量的容器，当程序输入了拔了几个萝卜吃了几个萝卜时，它会把吃了几个萝卜从萝卜数量容器中减去，最后输出还剩下几个萝卜或者萝卜不够吃。

以下是一个简单的C++代码示例：

#include <iostream>
#include <vector>

class Carrot {
 public:
  static int count;
  static std::vector<int> carrots;
};

int Carrot::count = 0;
std::vector<int> Carrot::carrots;

class Rabbit {
 public:
  void pullCarrots(int num) {
    Carrot::count -= num;
    if (Carrot::count < 0) {
      std::cout << "The carrots are not enough to eat." << std::endl;
      Carrot::count = 0;
    }
  }

  void eatCarrots(int num) {
    if (num > Carrot::count) {
      std::cout << "The carrots are not enough to eat." << std::endl;
    } else {
      Carrot::count -= num;
    }
  }

  void showCarrots() {
    std::cout << "There are " << Carrot::count << " carrots left." << std::endl;
  }
};

int main() {
  int pull, eat;
  Rabbit rabbit;
  Carrot::carrots.push_back(5);
  Carrot::carrots.push_back(3);
  Carrot::count = Carrot::carrots.size();
  std::cout << "Please enter the number of carrots you want to pull: ";
  std::cin >> pull;
  rabbit.pullCarrots(pull);
  std::cout << "Please enter the number of carrots you want to eat: ";
  std::cin >> eat;
  rabbit.eatCarrots(eat);
  rabbit.showCarrots();
  return 0;
}

该代码实现了一个兔子拔萝卜吃萝卜的程序，包含两个类：兔子类和萝卜类。萝卜类有一个静态公有的数量变量和一个vector容器来存储萝卜数量，兔子类通过拔萝卜和吃萝卜的操作来减少萝卜数量，并最后输出还剩下多少萝卜。