initialize size of 2d vector c++ code example

Example 1: initializing 2d vector

vector<vector<int> > vec( n , vector<int> (m, 0));

Example 2: initialzing a 2d vector in cpp

// Create a vector containing n row and m columns
  vector<vector<int> > vec( n , vector<int> (m, 0));

Example 3: 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*/

Example 4: size of a matrix using vector c++

// finding size of a square matrix
myVector[0].size();

Example 5: c++ initialize size of 3d vector

vector<vector<vector<double>>> f(3, vector<vector<double>>(4, vector<double>(5)));