Source favicon22:17 数独(Sudoku) 游戏 » DBA notes

两年来第一次玩游戏:数独.

什么是数独(Sudoku)?

据说是大数学家欧拉(Euler)发明了数独的最初版本。这个游戏在日本开始流行,数独(Sudoku)即为日语的音译(意译其实也是),也就是只有一个数字的意思。数独是一种以数字排列为基础的填空游戏,并不涉及任何计算学问,但需运用推理及逻辑思考,是锻炼逻辑思维的不错的游戏。

数独游戏在 1979 年前后已经在美国杂志上刊登,但在众多填字游戏中并未引起特别注意。直到 1984 年,日本的填字游戏出版商 Nikoli 公司的煅治真起从美国发现了这个游戏,决定引入日本并将其命名为 Sudoku,意思是“每个数字只能出现一次”。

数独的玩法:

数独拼图是九宫格(即 3 格宽乘 3 格高)的正方形,每一格又细分为一个九宫格。

数独游戏图示


在每一个小九宫格中,分别填上1至9的数字,让整个大九宫格每一列、每一行的数字都不重复。

数独游戏玩法

还记得金庸的《射雕英雄传》么? 黄蓉在破解瑛姑的九宫图说的"二四为肩,六八为足,左三右七,戴九履一,五居中央",其实早在我国的汉朝就有记载“九宫格”啦。要说起来啊, 这玩意儿还是祖国宝贵的文化遗产啊 :)

PortableApps 发布了一个便携版的数独游戏小工具:Sudoku Portable。数独爱好者不妨下载来玩玩。这个游戏当前不包含数独的变种形式。


更多阅读:

什么是数独? (维基百科介绍的很好,可惜被"阻尼"啦)
数独,正在成为一门学问
数独背后的四个数学问题
大锤解数独
Solving Every Sudoku Puzzle


--EOF--

Source favicon16:57 Eyetrack III - Homepage Viewing Patterns » del.icio.us/chedong
网站浏览用户的用户行为分析。
Source favicon10:50 戴尔的直销困境 » del.icio.us/chedong
IDC表示,2005年,家用笔记本电脑的发货量较2000年增长了逾一倍,由2,640万台增到了6,530万台。这家研究公司预测,到2010年,消费者对笔记本电脑的需求可能将超过企业。
Source favicon07:24 The best stories on Earth » Official Google Blog




Everyone knows that Google Earth imagery and 3D terrain are unbelievably cool and fun to explore. But while you're flying around, have you ever wondered what is actually going on "down there" -- on the real earth? That narrative of living on this planet is portrayed in the new Featured Content for Google Earth. Accessible from the "Featured Content" folder in the Google Earth Layers sidebar, these new layers contain images, audio, video, stories and information about events unfolding around the globe.



In our September installment, follow the daily exploits of "Flirt" and her kindred Tanzanian chimpanzees in The Jane Goodall Institute's "geoblog"; fans have called this a "Chimp Soap Opera." Or go on a virtual safari in South Africa's Krueger Park -- or maybe you'd like to learn about how the locals in Reykjavik, Iceland relax in molten-lava-heated pools. Explore more than 10,000 miles of trails (in full 3D) in the U.S. National Parks, and find an idyllic lakeside camping spot in the backcountry of Yosemite. Visualize the global story of the earth itself, and how our environment has changed over the past 30 years -- or travel back in time to the Valley of the Kings in Egypt to discover the gold treasures of King Tut's tomb.



This first installment of Featured Content features six of the world's seven continents. (We fully expect that Antarctica will have a story or two coming up.)



By some accounts, nearly half of the information on the web actually relates to a place on earth. We'd like to help you find the best of that information and place it in the visually compelling context of our beautiful planet.



Source favicon00:55 UNCF Google Scholarship Program » Official Google Blog


As part of Google's ongoing commitment to advancing computing and technology, we're pleased to tell you that the United Negro College Fund and Google have partnered to create the UNCF/Google Scholarship Program. We hope this program will encourage students to excel in their studies, inspire them to become role models and leaders, and help remove the financial barriers for African-American students wishing to pursue an engineering degree.

On the strength of candidates' academic background and demonstrated leadership, we'll be awarding $5,000 scholarships. Students must be enrolled in their junior year of undergraduate study at a UNCF Member College or University or at a participating Historically Black College or University (HBCU), and pursuing a Computer Science or Computer Engineering major.

Tell your friends, or apply yourself -- the deadline for applications is Friday, October 6.

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