Question

How can I access and print with “cout” an element of a vector that is stored inside another vector that has been initialised dinamically.

So, for example I have a vector and a vector of vectors created with “new”

vector<int> v1;
v1.push_back(1);
v1.push_back(2);
vector<vector<int> >* vV = new vector<vector<int> >();
vV->push_back(v1);
// way to access v1[0] from vV and way to cout << vV[0][0] (just an example)

I’m creating the vector of vectors with new because I need it to be very big, so I need to allocate it to the heap, as if I allocate on the stack it crashes.

Answer 1

Use parentheses:

std::cout << (*vV)[0][0] << std::endl;