摘要：
p(k)=(y^k) / (k!) * e^(-y)其中的y就是平均值k就是我们要求的大小。Alien's OrganTime Limit:2 Seconds Memory Limit:65536 KBThere's an alien whose name is Marjar. It is an universal solder came from planet Highrich a long time ago.Marjar is a strange alien. It needs to generate new organs(body parts) to fight. The 阅读全文
