Online JudgeProblem SetAuthorsOnline ContestsUser
Web Board
Home Page
F.A.Qs
Statistical Charts
Problems
Submit Problem
Online Status
Prob.ID:
Register
Update your info
Authors ranklist
Current Contest
Past Contests
Scheduled Contests
Award Contest
User ID:
Password:
  Register

Re:看不懂解题报告。。。请哪位解释一下?。。。

Posted by 497597816 at 2007-06-01 23:42:59 on Problem 3219
In Reply To:Re:看不懂解题报告。。。请哪位解释一下?。。。 Posted by:Iambitious at 2007-04-28 17:14:16
> c(m,n) = m!/n!/(m-n)!
> 分别求出m,n,m-n三个阶乘里面有多少个2,只要m!中2的个数多余n!中2的个数加上(m-n)!中2的个数,那么结果就是偶数
> N & M是什么原理阿?同问

Followed by:

Post your reply here:
User ID:
Password:
Title:

Content:

Home Page   Go Back  To top


All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please Contact Administrator