int n;
std::cin>>n;

char** p;

p = new char[n];

int second = 6;

//memory allocation
for(int i = 0;  i < n; ++i)
{
    p[i] = new char[second];
    ++second;
}

//freeing memory

for(int i = 0; i < n; ++i;)
{
    delete[] p[i];
    //p[i] = nullptr; C tva ne go podurja mai4e ;-;
    p[i] = NULL;
}
delete[] p;