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
欢迎参加IJCAI 2020麻将智能体竞赛,大奖等你拿!Welcome to IJCAI 2020 Mahjong AI competition with amazing prizes!

Re:更深层次的含义。。。

Posted by 199003 at 2012-02-18 21:02:41 on Problem 1218
In Reply To:更深层次的含义。。。 Posted by:781778304 at 2011-10-07 10:24:08
楼上说得很详细,举个例子,
9=1*9=3*3,9的约数有1,3,9,能影响到的round只有1,3,9,奇数,所以是开的
10=1*10=2*5,10的约数有1,2,5,10,能影响到的round只有1,2,5,10,偶数,所以是关的
除了完全平方数,它的约数都是成双的,完全平方数还多了一个算术平方根,约数的数量就是奇数了。

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