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mysql 如何选择随机行
最简单的方式是使用 mysql 的 ORDER BY RAND() 子句。SELECT col1 FROM tbl ORDER BY RAND() LIMIT 10;它能很好的运行在小表中。然而,对于大表,生成随机列表行时将产生一个严重的性能问题,MYSQL 需要对每一行进行随机,然后对它们排序。即...
分类:数据库   时间:2014-05-05 11:04:53    阅读次数:483
线段数 --- (单点更新、求逆序对)
Minimum Inversion Number Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d & %I64u Description The inversion number of a given number seque...
分类:其他好文   时间:2014-05-04 12:27:07    阅读次数:349
线段树 --- (单点更新、求区间最值、模板题)
A - 敌兵布阵 Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%I64d & %I64u Description C国的死对头A国这段时间正在进行军事演习,所以C国间谍头子Derek和他手下Tidy又开始忙乎了。A国在海岸线沿直线布置...
分类:其他好文   时间:2014-05-04 12:26:09    阅读次数:267
线段树 --- (区间维护+逆推)
Buy Tickets Time Limit:4000MS Memory Limit:65536KB 64bit IO Format:%I64d & %I64u DescriptionRailway tickets were difficult to buy around the Lunar New...
分类:其他好文   时间:2014-05-04 12:01:48    阅读次数:306
hdu 3944 dp?
DP?Time Limit: 10000/3000 MS (Java/Others)Memory Limit: 128000/128000 K (Java/Others)Total Submission(s): 1804Accepted Submission(s): 595Problem Descr...
分类:其他好文   时间:2014-05-04 11:20:23    阅读次数:291
hdu 3037 Saving Beans
Saving BeansTime Limit: 6000/3000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2079Accepted Submission(s): 748Problem...
分类:其他好文   时间:2014-05-04 10:18:48    阅读次数:197
HDU 2680Choose the best route (SPFA)
转载请注明出处:http://blog.csdn.net/u012860063 百度之星编程大赛——您报名了吗?  杭电ACM 2014暑期集训队——选拔安排~ Choose the best route Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/327...
分类:其他好文   时间:2014-05-04 09:43:23    阅读次数:360
HDOJ 3487 Play with Chain
裸的Splay  翻转+剪切粘贴 Play with Chain Time Limit: 6000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 3397    Accepted Submission(s): 1408 Problem Des...
分类:其他好文   时间:2014-05-04 09:11:28    阅读次数:280
poj 1014 Dividing
Dividing Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 57229   Accepted: 14680 Description Marsha and Bill own a collection of marbles. They want to spli...
分类:其他好文   时间:2014-05-03 21:52:18    阅读次数:253
[ACM] hdu 1260 Tickets (动态规划)
Tickets Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 65536/32768K (Java/Other) Total Submission(s) : 4   Accepted Submission(s) : 2 Font: Times New Roman | Verdana | Georgia Font Size: ←...
分类:其他好文   时间:2014-05-03 21:16:19    阅读次数:360
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