#include <iostream>
#include <vector>
using namespace std;

class Array1D
{
private:
    vector<int> arr;
public:
    Array1D(size_t num):arr(num){}
    int& operator[] (size_t pos){return arr[pos];}
    inline size_t GetSize(){return arr.size();}
};

class Array2D
{
private:
    vector<Array1D> arr;
public:
    Array2D(size_t row,size_t col):arr(row,col){}
    Array1D& operator[] (size_t pos){return arr[pos];}
    inline size_t GetSize(){return arr.size();}
};

int main()
{
    cout<<"==value=="<<endl;
    const size_t row = 2;
    const size_t col = 3;
    Array2D arr2D(row,col);
    for(size_t i=0;i<row;i++)
        for(size_t j=0;j<col;j++)
            arr2D[i][j] = i+j;
    
    for(size_t i=0;i<row;i++)
    {
        for(size_t j=0;j<col;j++)
            cout<<arr2D[i][j]<<" ";
        cout<<endl;
    }
    
    cout<<"==size=="<<endl;
    cout<<arr2D.GetSize()<<endl;
    cout<<arr2D[0].GetSize()<<endl;
    
    return 0;
}