摘要： 题意就是说你有n种彩票，现在想积齐n种，问等概论的情况下，你平均要买多少张下面说一下自己的思路已经买了i张时，买中剩下的概率为（n-i）/n，则要买的张数为n/(n-i)所以呢要买（n/n+n/n-1+n/n-2+............n/1)然后呢留给我的就是写很长的代码这个来求这个整数或者带... 阅读全文

摘要： 以前好像做过一些，但是没有总结过，现在想重新的做一遍，好好的总结一下！Problem DescriptionThe expression N!, read as "N factorial," denotes the product of the first N positive integers, ... 阅读全文

摘要： Problem DescriptionFred Mapper is considering purchasing some land in Louisiana to build his house on. In the process of investigating the land, he le... 阅读全文