Permutation p is
an ordered set of integers p1,??p2,??...,??pn,
consisting of n distinct positive integers, each of them doesn't exceed n.
We'll denote the i-th element of permutation p as pi.
...
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其他好文 时间:
2014-07-22 23:00:15
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312
转自http://www.cnblogs.com/qixuejia/archive/2010/07/14/1777105.html1.聚合函数(1)AVG函数功能返回组中值的平均值。空值将被忽略语法AVG([
ALL | DISTINCT ] expression)(2)MAX函数功能返回表达式的最...
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数据库 时间:
2014-05-05 23:23:05
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560
Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets
so as the following conditions hold:
The product of all numbers in the first set is less ...
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其他好文 时间:
2014-05-03 23:51:19
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621
1、能用DISTINCT的就不用GROUP BY
SELECT OrderID FROM Details WHERE UnitPrice > 10 GROUP BY OrderID
可改为: SELECT DISTINCT OrderID FROM Details WHERE UnitPrice > 10
2.能用UNION ALL就不要用UNION
UNION A...
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数据库 时间:
2014-05-03 21:31:24
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342
Given a set of distinct integers, S, return all possible subsets.
Note:
Elements in a subset must be in non-descending order.The solution set must not contain duplicate subsets.
For exa...
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其他好文 时间:
2014-05-03 15:47:53
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289
SubsetsGiven a set of distinct integers,S,
return all possible subsets.Note:Elements in a subset must be in non-descending
order.The solution set must...
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其他好文 时间:
2014-05-02 16:39:15
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315
去重有两层含义,一:是记录完全一样;二:是符合一定条件的认为是重复。根据表的数量,去重可划分为:单表去重和多表关联去重。对于去重,一般最容易想到的是用distinct,而distinct只能对记录完全重复的记录保留一条。distinct使用的是二重循环的方式来去重的,如果数据量非常大的时候,会导致性...
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数据库 时间:
2014-05-01 11:36:20
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422
Oracle单表去重去重有两层含义,一:是记录完全一样。二:是符合一定条件的认为是重复。根据表的数量,去重可划分为:单表去重和多表关联去重。对于去重,一般最容易想到的是用distinct,而distinct只能对记录完全重复的记录保留一条。distinct使用的是二重循环的方式来去重的,如果数据量非...
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数据库 时间:
2014-05-01 11:13:53
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555
Problem 1:Given a set of distinct integers, S,
return all possible subsets.Note:Elements in a subset must be in non-descending
order.The solution set ...
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其他好文 时间:
2014-05-01 09:43:43
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414
Pat1063代码
题目描述:
Given two sets of integers, the similarity of the sets is defined to be Nc/Nt*100%, where Nc is the number of distinct common numbers shared by the two sets,
and Nt is the to...
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其他好文 时间:
2014-04-29 13:44:20
阅读次数:
325