vector<vector<int>> a;
int r=a.size() //gives no of rows
int c=a[0].size() //gives no of columns
myVector[
Vector[0, 4, 2, 5],
Vector[1, 4, 2]
];
/*When you call for myVector[1].size() it would return 3 and [0] would return 4.
For the amount of rows (int vectors) in the 2d vector, you can just use myVector.size()
You can run this to see it in actions*/
#include <iostream>
#include <vector>
int main(){
std::vector<std::vector<int>>MyVector;
std::cout << "Rows in the 2d vector: " << MyVector.size() <<
std::endl << "Collumns in the 1st row: " << MyVector[0].size() <<
std::endl;
return 0;
}