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[Leetcode] 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:2014-11-13 09:19:23    阅读次数:220
Climbing Stairs
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...
分类:其他好文   时间:2014-11-12 16:24:33    阅读次数:226
[leetcode]Subsets
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...
分类:其他好文   时间:2014-11-12 11:46:52    阅读次数:169
Mysql常用语句
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...
分类:数据库   时间:2014-11-12 11:46:20    阅读次数:237
自定义通用Distinct去除重复数据
由于Lambda Distinct方法默认是按照集合里面的值比较的,所以当集合里面存放的是类的时候,我们一般是按照实体中的某一属性值比较,其实是用默认的Distinct也可以的,自己先定义一个实现了接口IEqualityComparer的类,然后调用Distinct的重载将这个类传递进去,但是这样太...
分类:其他好文   时间:2014-11-11 20:46:02    阅读次数:198
Oracle学习第三篇—多行函数
0 order by asc/desc 默认升序 order by 列的名字|表达式|别名|序号 把空放在后边:order by desc nulls last1分组函数--会自动滤空值 count(*|distinct|clumn) max min sum avg select s...
分类:数据库   时间:2014-11-10 21:21:06    阅读次数:354
LeetCode 50 N-Queens
The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an integer n, return all distinct solutions to the n-queens puzzle. E...
分类:其他好文   时间:2014-11-10 20:00:33    阅读次数:193
LeetCode 51 N-Queens II
Follow up for N-Queens problem. Now, instead outputting board configurations, return the total number of distinct solutions. 思路1:打表 public class Solution { public int totalNQ...
分类:其他好文   时间:2014-11-10 19:58:54    阅读次数:220
[LeetCode]Distinct Subsequences 匹配(不要求连续)的子串
一开始第一反映是用暴搜+回溯剪枝,妥妥的超时,见numDistinct0函数。 后来想到这跟公共子串有点类似,满足最优子结构和重叠问题,因此可用DP。 状态转移方程如下:             { dp[i-1,j-1]+dp[i-1][j] , 当s[i]==s[j],0 dp[i,j]={ dp[i-1][j],                     当s[i]!=s[j] ,0 ...
分类:其他好文   时间:2014-11-09 23:51:47    阅读次数:256
mysql查询处理顺序
http://zhangzhaoaaa.iteye.com/blog/1689412参考:《MYSQL技术内幕SQL编程》select distinct from lefttablejoin on wheregroup bywith{CUBE|ROLLUP}HAVINGorder bylimit处理...
分类:数据库   时间:2014-11-09 11:03:52    阅读次数:145
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