[跨平台] 智龙迷城，求个暗天或火龙女的初始。

posted by wap, platform: Galaxy Nexus某人计算结果：
"黑莓铁三角的氪金量：
按50%期望，简单算（都算在暗up+神up时先抽到黑莓再抽到服部，暗光骑在大妈指定up时抽）的话就是
log(0.5)/log(1-0.0025*(1-0.01))+log(0.5)/log(1-0.01)+log(0.5)/log(1-0.0175)
把log(0.5)提取出来，方便改换期望
1/log(0.997525)+1/log(0.99)+1/log(0.9825)=-559.6807459140872
那么50%期望下的黑莓三角，约需要：log(0.5)/-559.6807459140872=387.9抽
75%期望下，约需要log(0.25)/-559.6807459140872=775.9抽"