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SQL基础学习笔记(五)—序列、索引、同义词
常见的数据库对象 表:基本的数据存储集合,由行和列组成 视图:从表中抽出逻辑上相关的数据集合 序列:提供有规律的数值 索引:提高查询效率 同义词:给对象起别名 (索引和同义词了解即可) 序列sequences 可供多个用户用来产生唯一数值的数据库对象 自动提供唯一的数值 共享对象 主要用于提供主键值 将序列值装入内存可以提高访问效率 如何和创建序列 CREA...
分类:数据库   时间:2015-02-05 20:32:01    阅读次数:241
HDU 4405 Aeroplane chess(概率DP)
题目大意: Hzz loves aeroplane chess very much. The chess map contains N+1 grids labeled from 0 to N. Hzz starts at grid 0. For each step he throws a dice(a dice have six faces with equal probability to f...
分类:其他好文   时间:2015-02-04 16:32:06    阅读次数:156
bzoj3850 ZCC Loves Codefires
DescriptionThough ZCC has many Fans, ZCC himself is a crazy Fan of a coder, called "Memset137".It was on Codefires(CF), an online competitive programm...
分类:其他好文   时间:2015-02-01 20:16:10    阅读次数:238
(中等) HDU 4979 A simple math problem. , DLX+重复覆盖+打表。
Description Dragon loves lottery, he will try his luck every week. One day, the lottery company brings out a new form of lottery called accumulated...
分类:其他好文   时间:2015-01-31 14:33:10    阅读次数:190
【KMP】Number Sequence
KMP算法KMP的基处题目,数字数组的KMP算法应用。主要是模式串的处理,当模式串内有重复时,模式串向左回溯重复的点的位置(next[])。Problem DescriptionGiven two sequences of numbers : a[1], a[2], ...... , a[N], a...
分类:其他好文   时间:2015-01-31 00:03:28    阅读次数:170
SDJZU_新生_字符串匹配(KMP)_A - Number Sequence
A - Number Sequence Crawling in process... Crawling failed Time Limit:5000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Description Given two sequences of numbers : a[1...
分类:其他好文   时间:2015-01-29 17:52:50    阅读次数:240
Multithreading For Performance
[This post is by Gilles Debunne, an engineer in the Android group who loves to get multitasked. — Tim Bray]A good practice in creating responsive appl...
分类:其他好文   时间:2015-01-28 14:34:20    阅读次数:180
1020. Tree Traversals (序列建树)
Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, you are supposed to ou...
分类:其他好文   时间:2015-01-28 14:32:56    阅读次数:152
个人笔记-oracle
序列 select * from user_sequences select last_number from user_sequences where sequence_name='T_JGXX_POLY_SEQ'; alter sequence T_JGXX_POLY_SEQ increment by 1; SELECT T_JGXX_POLY_SEQ.NEXTVAL FROM DUAL;...
分类:数据库   时间:2015-01-27 18:24:39    阅读次数:171
hdu4360 As long as Binbin loves Sangsang spfa变形
题意:给定n个点m条边的无向图,每次必须沿着LOVE走,到终点时必须是完整的LOVE,且至少走出一个LOVE,问这样情况下最短 路是多少,在一样短情况下最多的LOVE个数是多少。注意:有自环!(见底下的数据) 思路:其实本质就是个最短路,用spfa就好。注意自环的特殊处理,详见代码: /*****************************************************...
分类:其他好文   时间:2015-01-27 09:28:00    阅读次数:162
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