How do I find the size of a 2 dimensional vector? So far I have the following code which doesn't compile.
using namespace std;
vector < vector <int> > v2d;
for (int x = 0; x < 3; x++)
for (int y = 0; y < 5; y++)
v2d.push_back(vector <int> ());
To get the size of v2d, simply use v2d.size(). For size of each vector inside v2d, use v2d[k].size().
Note: for getting the whole size of
v2d, sum up the size of each individual vector, as each vector has its own size.