CPP

2d vector c++ size

vector<vector<int>> a;
int r=a.size() //gives no of rows
  int c=a[0].size() //gives no of columns

how to get size of 2d vector in c++

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*/

2d vector size c++

#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;
}