//动态的数组分配的实现

class activeArray {
public:
    activeArray(int size);
    ~activeArray();
    int size;
    int** a = new int* [size];//二维数组的动态实现
};
activeArray::activeArray(int size) {
    this->size = size;
}
activeArray::~activeArray() {
    delete[] a;
}

用main函数来调配

activeArray aa(size);
//下面一句很重要，二维数组的实现关键
aa.a[i] = new int[aa.size];