Question

How to initialize a 2 dimensional vector<int> in C++?

For instance I have 4 arrays each of length 8 ints, like the below

int a1[] = {1,2,3,4,5,6,7,8};
int a2[] = {1,2,3,4,9,10,11,12};
int a3[] = {1,2,5,6,9,10,13,14};
int a4[] = {1,3,5,7,9,11,13,15};

and I have this

vector< vector <int> > aa (4);

aa[i] (a1,a1+8);

But this gives error. I even tried supplying the array a1 to v1 and passed v1 to aa[i] , still it fails.

So what would be the proper way of initializing the elements of a 2 dimensional vector<int>

Answer 1

aa[i].assign(a1,a1+8);