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CaoHaha's staff (HDU 6154)(2017中国大学生程序设计竞赛 - 网络选拔赛)

"You shall not pass!" After shouted out that,the Force Staff appered in CaoHaha's hand. As we all know,the Force Staff is a staff with infinity power.If you can use it skillful,it may help you to do whatever you want. But now,his new owner,CaoHaha,is a sorcerers apprentice.He can only use that staff to send things to other place. Today,Dreamwyy come to CaoHaha.Requesting him send a toy to his new girl friend.It was so far that Dreamwyy can only resort to CaoHaha. The first step to send something is draw a Magic array on a Magic place.The magic place looks like a coordinate system,and each time you can draw a segments either on cell sides or on cell diagonals.In additional,you need 1 minutes to draw a segments. If you want to send something ,you need to draw a Magic array which is not smaller than the that.You can make it any deformation,so what really matters is the size of the object. CaoHaha want to help dreamwyy but his time is valuable(to learn to be just like you),so he want to draw least segments.However,because of his bad math,he needs your help.

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令人称奇的简单证明:五种方法证明根号2是无理数

令人称奇的简单证明:五种方法证明根号2是无理数     我喜欢各种各样的证明。人们很难想到这样一些完全找不到突破口的东西竟然能够证明得到。说“没有突破口”还不够确切。准确地说,有些命题多数人认为“怎么可能能够证明”却用了一些技巧使得证明变得非常简单。我看了五色定理的证明,定理宣称若要对地图进行染色使得相邻区域不同色,五种颜色就够了。没看证明之前,我一直在想这个玩意儿可以怎么来证明。直到看了证明过程后才感叹居然如此简单,并且立即意识到四色定理基本上也是这种证明方法。还有,像“一个单位正方形里不可能包含两个互不

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