Работа с массивами/указателями

unsigned short int ** vrem = new unsigned short int*[frame_count];
    for (int i = 0; i < frame_count; i++)
    {
        vrem[i] = new unsigned short int[width*height];
    }
    for (int i = 0; i < frame_count; i++)
    {
        unsigned short int * ptr_buffer = new unsigned short int[width*height];
        rdr->GetFrame(FrameType::FT_16_BPP_GRAY, i, ptr_buffer, width*height * 2);
        vrem[i] = ptr_buffer;
        delete[] ptr_buffer;
    }

for (int j=0; j<width*height; j++)
  vrem[i][j] = ptr_buffer[j]; 
delete[] ptr_buffer;

    unsigned short int ** vrem = new unsigned short int*[frame_count];
    for (int i = 0; i < frame_count; i++)
    {
        vrem[i] = new unsigned short int[width*height];
    }
    
    unsigned short int * ptr_buffer = new unsigned short int[width*height];
    //...
    delete [] vrem[3];
    vrem[3] = ptr_buffer;

int main()
{
    int frame_count = 5;
    int width = 3;
    int height = 4;
    unsigned short int ** vrem = new unsigned short int*[frame_count];
    for (int i = 0; i < frame_count; i++)
    {
        vrem[i] = new unsigned short int[width*height];
    }
 
    for (int i = 0; i < frame_count; ++i)
        for (int j = 0; j < width * height; ++j)
            vrem[i][j] = 1;
 
    for (int i = 0; i < frame_count; ++i)
    {
        for (int j = 0; j < width * height; ++j)
            cout << vrem[i][j] << ' ';
        cout << endl;
    }
    cout << endl << endl;
 
    unsigned short int * ptr_buffer = new unsigned short int[width * height];
    for (int i = 0; i < width * height; ++i)
        ptr_buffer[i] = 2;
    
    delete [] vrem[3];
    vrem[3] = ptr_buffer;
 
    for (int i = 0; i < frame_count; ++i)
    {
        for (int j = 0; j < width * height; ++j)
            cout << vrem[i][j] << ' ';
        cout << endl;
    }
 
    for (int i = 0; i < frame_count; ++i)
        delete [] vrem[i];
    delete [] vrem;
    
    system("pause");
    return 0;
}