LCS stands for longest common subsequence, and it is a well known problem. A sequence in thisproblem means a list of integers, and a sequence X is con...
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其他好文 时间:
2014-08-22 00:14:45
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303
1、查询语句 (1)select 列名, 列名, ... from 表名 例:setect * from 表名 获取表格中所有内容 (2)select distinct 列名, 列名, ... from 表名 //获取某列唯一不同的值 (3)select 列名...
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数据库 时间:
2014-08-21 22:35:54
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320
Oracle数据库中Select语句语法及介绍SELECT [ ALL | DISTINCT ] ,[,…][WHERE ][GROUP BY [HAVING]][ORDER BY [ASC | DESC]]语句说明:[]方括号为可选项[GROUP BY [HAVING]]指将结果按的值进行分组.....
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数据库 时间:
2014-08-21 16:45:54
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292
A classic and representative DP problem. To be revised later. Quite a few interesting details to think about.class Solution {public: int numDistinc...
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其他好文 时间:
2014-08-21 13:03:34
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180
Problem 29
Consider all integer combinations of ab for 2 ≤ a ≤ 5 and 2 ≤ b ≤ 5:
22=4, 23=8, 24=16, 25=32
32=9, 33=27, 34=81, 35=243
42=16, 43=64, 44=256, 45=1024
52=25, 53=125, 54=625, 55=312...
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其他好文 时间:
2014-08-21 08:26:53
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177
今天调优一条SQL语句,由于SQL比较复杂,用autotrace很难一眼看出哪里出了问题,直接上10046。
SELECT AB.*
FROM (SELECT A.*, rownum RN
FROM (SELECT *
from (SELECT DISTINCT (D.DEVICE_ID), F.FUNCTION_LOCATION_ID
f...
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数据库 时间:
2014-08-20 21:14:23
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447
Query query =new Query(); SysTableLookup lookup; QueryBuil dDataSource ds; TableId table=tableNum(InventTrans); FieldId field=f...
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其他好文 时间:
2014-08-20 15:55:12
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132
1.SELECT选择 SELECT 列名称 FROM 表名称 SELECT * FROM 表名称(选择所有的列) SELECT SNO FROM SC SELECT * FROM SC2.DISTINCT列出不同的值,删除重复的 SELECT DISTINCT 列名称 FROM 表名称 ...
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数据库 时间:
2014-08-20 08:09:56
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179
题目:poj 1458 Common Subsequence
Description
A subsequence of a given sequence is the given sequence with some elements (possible none) left out. Given a sequence X = another sequence Z = is a...
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其他好文 时间:
2014-08-19 19:04:25
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182
题目:POJ 2533 Longest Ordered Subsequence
Description
A numeric sequence of ai is ordered if a1 a2 aN. Let the subsequence of the given numeric sequence (a1, a2, ..., aN)
be any sequence (ai1...
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其他好文 时间:
2014-08-19 16:37:44
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218