How can I push_back data in a 2d vector of type int

Question

I have a vector and want to store int data in to it at run time can I store the data in a 2D vector in this manner ?

std::vector> n         


        

Answer 1

Allocate n empty vectors, that is, empty vector for each index. Then push_back() can be applied.

int main()
{
    int n = 10;
    std::vector> normal;
    normal.resize(n);   //Allocating 'n' empty vectors
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < 20; j++)
        {
             normal[i].push_back(j);
        }
    }
    return 0;
}