8.统计列印各科成绩,各分数段人数: 课程ID,课程名称,[100-85],[85-70],[70-60],[ b 时,[a, b]是一个空集。9.列印学生平均成绩及其名次 select count(distinct b.f) as 名次,a.学生ID,max(a.学生姓名),max(a.f) fr...
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数据库 时间:
2014-11-15 11:15:53
阅读次数:
302
考虑两个字符串,我们用dp[i][j]表示字串第到i个和字符串到第j个的总数,因为字串必须连续
因此dp[i][j]可以有dp[i][j-1]和dp[i-1][j-1]递推而来,而不能由dp[i-1][j]递推而来。而后者的条件
是字串的第i个和字符串相等。
Problem E
Distinct Subsequences
Input: standard input
Output...
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其他好文 时间:
2014-11-15 00:13:39
阅读次数:
219
基本步骤是1.from2.join on3.where4.group by5.having6.order by7.select8.distinct ,sum,...9.limitjoin table 一定要有索引不然就是笛卡尔积了。inner join 的特别正确来讲 mysql 会先base on...
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数据库 时间:
2014-11-14 22:30:14
阅读次数:
334
Given a string S and a string T, count the number of distinct subsequences of T in S.
A subsequence of a string is a new string which is formed from the original string by deleting some (can be none)...
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其他好文 时间:
2014-11-14 12:40:18
阅读次数:
111
You are climbing a stair case. It takesnsteps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb...
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其他好文 时间:
2014-11-14 10:30:42
阅读次数:
146
Select Distinct Rows from DataTable' True=distinctDim table As DataTable = Me.SP3DPIA2014R1DataSet.SP3DPIA.AsDataView.ToTable(True, "ShortName")Sp3dpi...
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其他好文 时间:
2014-11-13 16:02:59
阅读次数:
163
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 co...
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其他好文 时间:
2014-11-13 09:19:23
阅读次数:
220
Climbing StairsYou are climbing a stair case. It takesnsteps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct way...
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其他好文 时间:
2014-11-12 16:24:33
阅读次数:
226
问题描述:
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 ex...
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其他好文 时间:
2014-11-12 11:46:52
阅读次数:
169
SQL常用语句: 一、常用关键词:1.distinct:过滤重复select distinct create_user_name from bms_project; 此种情况下,就要用到distinct过滤掉重复的。2.count: 统计select count(*) from bms_projec...
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数据库 时间:
2014-11-12 11:46:20
阅读次数:
237