DescriptionIn modern society, each person has his own friends. Since all the people are very busy, they communicate with each other only by phone. You...
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其他好文 时间:
2014-06-15 20:44:45
阅读次数:
162
Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum.
For example:
Given the below binary tree and sum
...
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其他好文 时间:
2014-06-15 19:26:23
阅读次数:
207
Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that
adding up all the values along the path equals the given sum.
For example:
Given the below bin...
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其他好文 时间:
2014-06-15 09:34:35
阅读次数:
226
SQL Server has two basics kinds of indexes. They are clustered and nonclustered indexes. There are some fundamental differences to the two which are k...
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其他好文 时间:
2014-06-15 06:30:52
阅读次数:
197
The procedure or function in this packagechecks if a database is ready to betransported to a target platform.and if a database has external tables,dir...
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数据库 时间:
2014-06-15 00:38:40
阅读次数:
412
题目描述Bruce Force's keyboard is broken, only a few keys are still working. Bruce has figured out he can still type texts by switching the keyboard layou...
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其他好文 时间:
2014-06-14 21:00:09
阅读次数:
444
Undo有什么用?当connection.rollback()时,用于回滚transaction系统或数据库出错时,用于恢复数据库提供读一致性用flashback query时,分析某一个时间点的数据逻辑错误时,用flashback恢复自动undo 管理用undo tablespace管理undo ...
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其他好文 时间:
2014-06-14 19:12:17
阅读次数:
246
HashMap基于hash表的Map接口实现,它实现了Map接口中的所有操作。HashMap允许存储null键和null值。这是它与Hashtable的区别之一(另外一个区别是Hashtable是线程安全的)。另外,HashMap中的键值对是无序的。下面,我们从HashMap的源代码来分析Has.....
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其他好文 时间:
2014-06-14 09:43:49
阅读次数:
304
今天在209服务器上要远程登录另外一台54的服务器,结果用ssh连接提示如下错误:[root@NHL~]#sshroot@10.40.49.54
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@WARNING:REMOTEHOSTIDENTIFICATIONHASCHANGED!@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@..
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其他好文 时间:
2014-06-13 21:02:04
阅读次数:
326