The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other.
Given an integer n, return all distinct solutions to the n-queens puzzle...
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其他好文 时间:
2014-10-12 16:58:58
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248
Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.
For example,
Given 1->2->3->3->4->4->5, return 1->2->5.
Given 1->1-...
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其他好文 时间:
2014-10-12 15:51:58
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190
SELECT DISTINCT * INTO #temp FROM grade;
DROP TABLE grade;
SELECT * INTO grade FROM #temp;
DROP TABLE #temp;
SELECT DISTINCT * INTO #temp FROM grade;
DROP TABLE grade;
SELECT * INTO grade FROM #temp;
DROP TABLE #temp;...
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数据库 时间:
2014-10-11 19:53:06
阅读次数:
191
引自:http://blog.csdn.net/shaopengfei/article/details/36426763从C# 3.0开始提供了Distinct方法,这对于集合的使用有了更为丰富的方法,经过在网上搜索相应的资源,发现有关这方面的写的好的文章还是不少的。而且为了扩展Linq的使用不方便...
Polymorphism is often referred to as the third pillar of object-oriented programming, after encapsulation and inheritance. It has two distinct aspects:
At run time, objects of a derived class may...
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其他好文 时间:
2014-10-10 14:05:54
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158
Problem DescriptionThere are 2 special dices on the table. On each face of the dice, a distinct number was written. Consider a1.a2,a3,a4,a5,a6 to be n...
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其他好文 时间:
2014-10-10 00:22:52
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482
Labeling BallsTime Limit:1000MSMemory Limit:65536KTotal Submissions:11146Accepted:3192DescriptionWindy hasNballs of distinct weights from 1 unit toNun...
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其他好文 时间:
2014-10-10 00:12:37
阅读次数:
264
我想对一个表里面字段a的个数进行进行统计,因为字段a有重复的记录,我想排除重复的记录,该sql语句为:select count(distinct a)
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其他好文 时间:
2014-10-09 17:23:07
阅读次数:
166
开发中有些按日期记录的记录需要各种维度的统计,按天,按月,按年,按小时,。。分组统计,还有些需要对字段去重统计,在之前的 [Mongo] 按时间分组统计(group时间格式化) 中用group实现了按天的统计,不过使用new Date()方法会有些坑,今天看了下aggregate中,使用聚合来写个时间统计。
tips: aggregate 挺复杂,弄明白了再做笔记,现在只是根据需求来查询。...
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其他好文 时间:
2014-10-09 17:00:37
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214
??
1 sqlplus登录方式:
普通用户登录:
登录eg:C:\>sqlplusscott/11
(格式:sqlplus
用户名/密码)
退出eg:quit退出
超级用户登录
C:\>sqlplus/nolog
S...
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数据库 时间:
2014-10-09 14:57:04
阅读次数:
441