2dvector c++

#include <iostream>
#include <vector>

int main() {
    // Step 1: Declare a 2D vector using the vector template with int as the data type.
    std::vector<std::vector<int>> my2DVector;

    // Step 2: Declare inner vectors to represent rows in the 2D vector.
    // Step 3: Populate the inner vectors with integer values to represent columns.
    my2DVector.push_back({1, 2, 3});
    my2DVector.push_back({4, 5, 6});
    my2DVector.push_back({7, 8, 9});

    // Step 4: Access and print elements of the 2D vector using nested loops.
    for (size_t i = 0; i < my2DVector.size(); ++i) {
        for (size_t j = 0; j < my2DVector[i].size(); ++j) {
            std::cout << my2DVector[i][j] << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}