回复：回复：让人烦恼的礼金卡问题
火球魔法
2009-01-06 01:54:19
( reads)
The optimal solution gets you 1000 * r, where r is the value such that 0
r*(1-r)/(1-0.81*r*r)
The optimal solution gets you 1000 * r, where r is the value such that 0
r*(1-r)/(1-0.81*r*r)
justatry
2009-01-06 21:45:31回复：回复：回复：让人烦恼的礼金卡问题