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leetcode[78] Subsets
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...
分类:其他好文   时间:2014-11-16 22:52:55    阅读次数:244
什么是string interning(字符串驻留)以及python中字符串的intern机制
In computer science, string interning is a method of storing only one copy of each distinct string value, which must be immutable. Interning strings makes some string processing tasks more tim...
分类:编程语言   时间:2014-11-16 12:06:31    阅读次数:221
Leetcode-Remove Duplicates from Sorted List II
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...
分类:其他好文   时间:2014-11-16 08:14:02    阅读次数:220
SQL查询语句之select详解和视图的概念
select语句学习数据库最核心的功能就是掌握增、删、查、改等命令的使用,其中查询语句最为复杂也最为重要。本文将重点介绍查询语句相关命令的使用。查询语句类型分为三种:简单查询、多表查询、子查询、联合查询(union)1、简单查询SELECT[DISTINCT]*FROMtb_name[WHERE字句|OR..
分类:数据库   时间:2014-11-16 02:03:32    阅读次数:307
msql 综合练习
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...
分类:数据库   时间:2014-11-15 11:15:53    阅读次数:302
UVA 10069 Distinct Subsequences(DP)
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...
分类:其他好文   时间:2014-11-15 00:13:39    阅读次数:219
MySQL sql 执行步骤
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...
分类:数据库   时间:2014-11-14 22:30:14    阅读次数:334
LeetCode 115 Distinct Subsequences
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)...
分类:其他好文   时间:2014-11-14 12:40:18    阅读次数:111
Climbing Stairs
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...
分类:其他好文   时间:2014-11-14 10:30:42    阅读次数:146
Select Distinct Rows from DataTable
Select Distinct Rows from DataTable' True=distinctDim table As DataTable = Me.SP3DPIA2014R1DataSet.SP3DPIA.AsDataView.ToTable(True, "ShortName")Sp3dpi...
分类:其他好文   时间:2014-11-13 16:02:59    阅读次数:163
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