Description There are N cities in a country, and
there is one and only one simple path between each pair of cities. A merchant
has chosen some paths a...
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其他好文 时间：
2014-04-30 17:09:30
阅读次数：
570
Carmichael Numbers An important topic nowadays in
computer science is cryptography. Some people even think that cryptography is
the only important fi....
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其他好文 时间：
2014-04-29 16:31:45
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504
DescriptionLetxandybe two strings over some finite
alphabetA. We would like to transformxintoyallowing only operations given
below:Deletion:a letter i...
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其他好文 时间：
2014-04-29 16:22:00
阅读次数：
450
