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

You cannot directly assign to [i] without allocating the outer and inner vectors first. One solution to this would be to create the inner vectors inside your for loop, then once those are populated, push_back to the outer vector.

std::vector> normal;
for(i=0;i<10;i++)
{
    std::vector temp;
    for(j=0;j<20;j++)
    {
        temp.push_back(j);
    }
    normal.push_back(temp);
}