最后, 如果你仔细看过题目,你会发现, LZ的问题根本不是网络上有名的two envelops problem, 这是个简化的版本. two envelops proble原题如下:
You have two indistinguishable envelops that each contain money. One contains twice as much as the other. You may pick one envelope and keep the money it contains. You pick at random, but before you open the envelope, you are offered the chance to take the other envelope instead.