def update_two_contribution_score(click_time_one, click_time_two):
    """
    user cf user contribution score update v2
    :param click_time_one: different user action time to the same item
    :param click_time_two: time two
    :return: contribution score
    """
    delta_time = abs(click_time_two - click_time_one)
    norm_num = 60 * 60 * 24
    delta_time = delta_time / norm_num
    return 1 / (1 + delta_time)