今盒子里有n个小球，A、B两人轮流从盒中取球，每个人都可以看到另一个人取了多少个，也可以看到盒中还剩下多少个，并且两人都很聪明，不会做出错误的判断。 -This box n balls, A, B two turns from the box to take the ball, everyone can see another person take the number, you can also see the left box, and two very smart, does not