题目:
You are climbing a stair case. It takes n steps to reach to the top.
Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?
思路解析:
无法一下子判断是 Fib...
分类:
编程语言 时间:
2014-12-23 15:39:32
阅读次数:
309
MongoDB除了基本查询功能之外,还有强大的聚合工具,其中包括:count()、distinct()、group()、mapreduce. 计数函数count count是最简单的聚合工具,用于返回文档的数量: >db.user.count() // 返回集合user的个数 传递查询文档时,则计算...
分类:
数据库 时间:
2014-12-22 21:06:31
阅读次数:
183
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 no...
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其他好文 时间:
2014-12-22 17:55:10
阅读次数:
220
为了去重复,写了一个通用的比较容器类,可以用在需要比较的地方,且支持Lamda表达式
dataTable.AsEnumerable().Distinct(new DataComparer((x, y) => return (x[1] == y[1] && x[2] ==y[2]))).CopyT...
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其他好文 时间:
2014-12-22 17:38:43
阅读次数:
122
select distinct name from syscomments a,sysobjects b where a.id=b.id and b.xtype='p' --and text like '%my_sp%'
分类:
数据库 时间:
2014-12-22 12:27:59
阅读次数:
180
问题描述:
Follow up for N-Queens problem.
Now, instead outputting board configurations, return the total number of distinct solutions.
(N-Queens problem can see
here )
基本思路:
可参照N-Queens问题,按...
分类:
其他好文 时间:
2014-12-21 22:12:49
阅读次数:
157
问题描述:
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 p...
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其他好文 时间:
2014-12-21 22:12:21
阅读次数:
159
AVG([ DISTINCT | ALL ] expr) [ OVER(analytic_clause) ]SELECT MANAGER_ID, LAST_NAME, HIRE_DATE, SALARY, AVG(SALARY) OVER(PARTITION BY MANAGER_ID ORDER ...
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其他好文 时间:
2014-12-21 16:28:23
阅读次数:
165
COUNT({ * | [ DISTINCT | ALL ] expr }) [ OVER (analytic_clause) ]SELECT ENAME, E.HIREDATE, COUNT(EMPNO) OVER(ORDER BY HIREDATE RANGE BETWEEN 30 PRE...
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其他好文 时间:
2014-12-21 16:27:12
阅读次数:
225
求解交换次数,用冒泡刚好
Sort it
时间限制:1000 ms | 内存限制:65535 KB
难度:2
描述You want to processe a sequence of n distinct integers by swapping two adjacent sequence elements until the sequence ...
分类:
编程语言 时间:
2014-12-21 14:02:44
阅读次数:
155