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codeforces A. Slightly Decreasing Permutations 题解
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. ...
分类:其他好文   时间:2014-07-22 23:00:15    阅读次数:312
T-SQL函数及用法--转
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...
分类:数据库   时间:2014-05-05 23:23:05    阅读次数:560
codeforces A. Array题解
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 ...
分类:其他好文   时间:2014-05-03 23:51:19    阅读次数:621
刚整理的SQL常见替代点
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...
分类:数据库   时间:2014-05-03 21:31:24    阅读次数:342
Leetcode:Subsets 求数组的所有子集
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...
分类:其他好文   时间:2014-05-03 15:47:53    阅读次数:289
leetcode: Subsets & Subsets II
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...
分类:其他好文   时间:2014-05-02 16:39:15    阅读次数:315
Oracle单表去重复(一)
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...
分类:数据库   时间:2014-05-01 11:36:20    阅读次数:422
Oracle单表去重复(二)
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...
分类:数据库   时间:2014-05-01 11:13:53    阅读次数:555
Subsets
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 ...
分类:其他好文   时间:2014-05-01 09:43:43    阅读次数:414
Pat(Advanced Level)Practice--1063(Set Similarity)
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...
分类:其他好文   时间:2014-04-29 13:44:20    阅读次数:325
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