def create_matrix(size):
    """Initialize a matrix as a Python list of lists.
    Indices of the matrix can then be called as m[row][column]

    Args:
        size (int): Number of vertices in the graph

    Returns:
        list(list())

    Time Complexity: T(V^2)
    """
    # m^2 matrix
    return [[0 for _x in range(size)] for _y in range(size)]