include

include

int main() { // Creating a 2-dimensional vector std::vector> matrix;

// Defining the number of rows and columns
int rows = 3;
int columns = 4;

// Resizing the vector to the desired dimensions
matrix.resize(rows, std::vector<int>(columns));

// Accessing and modifying elements in the vector
matrix[0][0] = 1;
matrix[0][1] = 2;
matrix[0][2] = 3;
matrix[0][3] = 4;
matrix[1][0] = 5;
matrix[1][1] = 6;
matrix[1][2] = 7;
matrix[1][3] = 8;
matrix[2][0] = 9;
matrix[2][1] = 10;
matrix[2][2] = 11;
matrix[2][3] = 12;

// Printing the elements of the vector
for (int i = 0; i < rows; i++) {
    for (int j = 0; j < columns; j++) {
        std::cout << matrix[i][j] << " ";
    }
    std::cout << std::endl;
}

return 0;

}