问题描述:
A robot is located at the top-left corner of a
m x n grid (marked 'Start' in the diagram below).
The robot can only move either down or right at any point in time. The robot is trying to r...
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其他好文 时间:
2014-11-07 11:24:26
阅读次数:
160
IntroductionOn Running Software运行时软件There’s something rather unique in Erlang in how it approaches failure compared to most other programming languages. There’s this common way of thinking where the...
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其他好文 时间:
2014-11-06 20:04:07
阅读次数:
296
REPLACE的运行与INSERT很相似。只有一点例外,假如表中的一个旧记录与一个用于PRIMARYKEY或一个UNIQUE索引的新记录具有相同的值,则在新记录被插入之前,旧记录被删除。注意,除非表有一个PRIMARY KEY或UNIQUE索引,否则,使用一个REPLACE语句没有意义。该语句会与I...
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数据库 时间:
2014-11-06 19:27:21
阅读次数:
271
容器hash_set是以hash table为底层机制的,差点儿所有的操作都是转调用hash table提供的接口。因为插入无法存储同样的键值,所以hash_set的插入操作所有都使用hash table的insert_unique接口,代码例如以下:pair insert(const value_...
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其他好文 时间:
2014-11-06 19:04:34
阅读次数:
200
A robot is located at the top-left corner of amxngrid (marked 'Start' in the diagram below).The robot can only move either down or right at any point ...
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其他好文 时间:
2014-11-06 17:09:15
阅读次数:
227
http://www.blogjava.net/ITdavid/archive/2009/02/25/256605.html注解方式的主键配置非自增字段为主键,注解annotation表示以N_LOG_ID字段为例:@Id@Column(name = "N_LOG_ID", unique = tru...
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Web程序 时间:
2014-11-06 17:03:24
阅读次数:
200
Follow up for "Unique Paths":Now consider if some obstacles are added to the grids. How many unique paths would there be?An obstacle and empty space i...
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其他好文 时间:
2014-11-06 16:53:40
阅读次数:
145
使用sql语句创建和删除约束约束类型主键约束(Primary Key constraint) --:要求主键列数据唯一,而且不同意为空。唯一约束(Unique constraint) --:要求该列唯一,同意为空,但仅仅能出现一个空值。检查约束(Check constraint) --:某列取值范围...
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数据库 时间:
2014-11-06 14:19:37
阅读次数:
131
I have a file, consisting of a column of numbers, some of which are the same, Iwant to count the occurrences of each unique number, here is the simple...
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其他好文 时间:
2014-11-06 14:19:06
阅读次数:
200
DescriptionFarmer John'sN(1 ≤N≤ 10,000) cows are lined up to be milked in the evening. Each cow has a unique "grumpiness" level in the range 1...100,0...
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其他好文 时间:
2014-11-05 16:53:49
阅读次数:
204