| 作者 |
 上次强答对"虫爬棱" 的同学, 如果英文好, 可以到IBM HR 申请"高"位了 |
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king
头衔: 海归中校
加入时间: 2005/02/22
文章: 388
海归分: 55570
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作者：king 在 海归茶馆 发贴, 来自【海归网】 http://www.haiguinet.com
开个玩笑, and probably you guys are smarter than IBM and who cares IBM jobs.
(ZT) IBM也掺和进来了.下面是IBM四月份的小虫爬棱PUZZLE (全球抢答题 ):
(解答先送到IBM去)
https://domino.research.ibm.com/Comm/wwwr_ponder.nsf/challenges/April2006.html
This month's puzzle concerns random walks on a n-dimensional hypercube. Each step of the random walk moves from one of the 2**n vertices of the hypercube to one of the n adjacent vertices selected at random. The vertices of a n-dimensional hypercube can be identified with length n 0-1 vectors in an obvious way. Consider random walks starting at the vertex (0,0,....,0). We want to know how many steps on average it will take for the random walk to reach the diagonally opposite vertex. This can be found by answering the following questions.
1. How many steps on average does it take the random walk to return to its starting point?
2. How many steps on average does it take the random walk to return to its starting point or reach the diagonally opposite vertex (ie the vertex (1,1,...,1))?
3. What is the probability that the random walk reaches the diagonally opposite vertex before it returns to its starting point?
4. How many steps on average does it take the random walk to reach the diagonally opposite vertex?
作者：king 在 海归茶馆 发贴, 来自【海归网】 http://www.haiguinet.com
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 上次强答对"虫爬棱" 的同学, 如果英文好, 可以到IBM HR 申请"高"位了 -- king - (1252 Byte) 2006-4-03 周一, 12:37 (1711 reads)
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