Akuna OA Python Dev #9

谢谢！！！！！！！！！！！！！！！！！！！！！！！！！

谢谢楼主分享

def dice_game(k):
    if k < 0:
        raise Exception

    expectation = 3.5
    for i in range(2, k+1):
        stop_rolls = [i for i in range(1, 7) if i > expectation]
        expectation = 1/6. * sum(stop_rolls) + (1-len(stop_rolls)/6.) * expectation

    return expectation