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PAT-1013 Battle Over Cities (25)
求解连通性问题,最好用的当然是并查集了,可以使用深搜或者广搜。这道题目的意思是给定一些道路,如果把其中一个顶点去掉,那么需要建立多少条道路才能联通所有顶点。这道题目如果用朴素的并查集的话第四个测试用例会超时,因此想到带路径压缩的并查集。递归或者非递归方式都可以,对于这道题目来说不会差别很大,不过用递...
分类:其他好文   时间:2014-09-19 22:19:06    阅读次数:229
Sparse Coding
Sparse CodingSparse coding is a class of unsupervised methods for learning sets of over-complete bases to represent data efficiently. —— 过完备的基,无监督 The...
分类:其他好文   时间:2014-09-19 18:57:05    阅读次数:272
oracle 自动添加序号列 排序
select HSL.sortno, HSL.B, HSL.A, row_number() over(order by sortno desc) xh from (select t.B, t.A, case when t.B= '股份公司' then 9999999 else t.A end as....
分类:数据库   时间:2014-09-18 18:10:24    阅读次数:216
python之平台独立的调试工具winpdb介绍
Winpdb is a platform independent graphical GPL Python debugger with support for remote debugging over a network, multiple threads, namespace modificat...
分类:数据库   时间:2014-09-17 18:36:24    阅读次数:339
Codeforces Round #265 (Div. 2) B. Inbox (100500)
Over time, Alexey's mail box got littered with too many letters. Some of them are read, while others are unread. Alexey's mail program can either show a list of all letters or show the content of a s...
分类:其他好文   时间:2014-09-17 15:16:42    阅读次数:248
POJ 1273 最大流 Dinic
Drainage Ditches Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 56802 Accepted: 21824 Description Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clo...
分类:其他好文   时间:2014-09-16 10:50:00    阅读次数:253
ORACLE,SQLSERVER等数据库如何获取某张表中相同字段最近一条数
SELECT * FROM ( SELECT JBXX.*,row_number() OVER (partition BY WRYMC ORDER BY WRYMC,CJSJ DESC) R   FROM T_WRY_JBXX  JBXX  ) A WHERE R=1...
分类:数据库   时间:2014-09-13 20:12:05    阅读次数:211
POJ - 2752 Seek the Name, Seek the Fame (KMP的next[]应用)
Description The little cat is so famous, that many couples tramp over hill and dale to Byteland, and asked the little cat to give names to their newly-born babies. They seek the name, and at the sa...
分类:其他好文   时间:2014-09-13 10:40:55    阅读次数:197
超过长度...
IE7以上都支持父元素加一下cssoverflow: hidden;white-space: no-wrap; //阻止换行text-over: ellipsis; //超过长度...子元素为行内元素就可
分类:其他好文   时间:2014-09-12 18:46:53    阅读次数:221
sql实现分组排序-实例分别获取男女成绩前三名的学生姓名
表scores(name,sex,score),分别获取男女前三名学生姓名。建立表格:createtablescores(namevarchar2(8),sexvarchar2(1),scorenumber(3,0))插入学生成绩insertintoscores(name,sex,score)values(‘男A‘,‘1‘,100);insertintoscores(name,sex,score)values(‘男B‘,‘1‘,90);insertint..
分类:数据库   时间:2014-09-12 15:28:14    阅读次数:264
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