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ASP.NET中GUID类
GUID(Global unique identifier)全局唯一标识符,它是由网卡上的标识数字(每个网卡都有唯一的标识号)以及 CPU 时钟的唯一数字生成的的一个 16 字节的二进制值。GUID 的格式为“xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx”,其中每个 x ...
分类:Web程序   时间:2014-10-17 02:03:03    阅读次数:348
leetcode第15题--3Sum
Problem:Given an arraySofnintegers, are there elementsa,b,cinSsuch thata+b+c= 0? Find all unique triplets in the array which gives the sum of zero.Not...
分类:其他好文   时间:2014-10-17 00:06:53    阅读次数:344
[LeetCode]Unique Paths
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 reach the ...
分类:其他好文   时间:2014-10-16 19:10:33    阅读次数:225
查看表的索引
show index from tblname查询后各列的描述· Table表的名称。· Non_unique如果MySQL索引不能包括重复词,则为0。如果可以,则为1。· Key_name索引的名称。· Seq_in_index索引中的列序列号,从1开始。· Column_name列名称。· Co...
分类:其他好文   时间:2014-10-16 13:39:52    阅读次数:128
innodb next-key lock解析
参考http://blog.csdn.net/zbszhangbosen/article/details/7434637#reply 这里补充一些: (1)InnoDB默认加锁方式是next-key locking (2)在聚集索引中,如果主键有唯一性约束(unique,auto increment),next-key locking 会自动降级为record locking。 (3)由于...
分类:数据库   时间:2014-10-16 11:04:42    阅读次数:305
[leetcode] Unique Binary Search Trees @ Python
Givenn, how many structurally uniqueBST's(binary search trees) that store values 1...n?For example,Givenn= 3, there are a total of 5 unique BST's. 1.....
分类:编程语言   时间:2014-10-16 00:30:31    阅读次数:210
leetcode - Permutation Sequence
The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, We get the following sequence (ie, for n = 3): "123""132""213""231""3...
分类:其他好文   时间:2014-10-15 19:33:41    阅读次数:145
leetcode - Unique Paths II
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 is marked as 1 and 0 respectively in the ...
分类:其他好文   时间:2014-10-15 16:48:01    阅读次数:196
leetcode - Unique Paths
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 reach the ...
分类:其他好文   时间:2014-10-15 16:02:10    阅读次数:190
Unique Paths
[leetcode]Unique Paths...
分类:其他好文   时间:2014-10-15 12:52:50    阅读次数:170
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