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ORACLE数据库操作简便函数用法
1、DISTINCT用法:          SELECT   DISTINCT    A.NAME  ,  A.STUDENT_ID  ,  A.SEX   FROM TABLE STUDENT            这条SQL语句是从学生表里查询了姓名,学号,性别,但是DISTINCT的查询规则是只要有一个不同,就是符合条件的。         例: 源数据...
分类:数据库   时间:2014-10-30 20:57:44    阅读次数:249
POJ2533——Longest Ordered Subsequence(简单的DP)
Longest Ordered SubsequenceDescriptionA numeric sequence of ai is ordered if a1 File Name: poj2533.cpp 3 > Author: Enumz 4 > Mail: 369372123@...
分类:其他好文   时间:2014-10-30 16:56:36    阅读次数:164
[Leetcode] Distinct Subsequences
Given a stringSand a stringT, count the number of distinct subsequences ofTinS.A subsequence of a string is a new string which is formed from the orig...
分类:其他好文   时间:2014-10-30 07:06:13    阅读次数:171
LeetCode Climbing Stairs
You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top? 每一次你可以爬一层或者两层,计算爬n层你...
分类:其他好文   时间:2014-10-30 00:24:42    阅读次数:202
Climbing Stairs
You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top? 简单递推 class Solution { pub...
分类:其他好文   时间:2014-10-29 22:21:11    阅读次数:175
POJ 1458 Common Subsequence(最长公共子序列问题)
Common Subsequence Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 39128   Accepted: 15770 Description A subsequence of a given sequence is the given seque...
分类:其他好文   时间:2014-10-29 17:06:06    阅读次数:261
Climbing Stairs 爬楼梯问题,每次可以走1或2步,爬上n层楼梯总方法 (变相fibnacci)
You are climbing a stair case. It takesnsteps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb...
分类:其他好文   时间:2014-10-29 12:48:28    阅读次数:170
Cardinality (基数)
名词Cardinality: 优化器在计算成本的时候,需要从统计信息中取得数据,然后去估计每一步操作所涉及的行数,叫做Cardinality。 比如,一张表T有1000行数据,列COL1上没有直方图,没有空值,并且不重复的值(distinct value)有500个。那么,在使用条件“WHERE.....
分类:其他好文   时间:2014-10-29 10:27:54    阅读次数:117
POJ 2533 Longest Ordered Subsequence(LIS)
H -LISTime Limit:2000MSMemory Limit:65536KB64bit IO Format:%I64d & %I64uSubmitStatusDescriptionA numeric sequence ofaiis ordered ifa1<a2< ... <aN. Let...
分类:其他好文   时间:2014-10-28 23:49:45    阅读次数:261
LeetCode--N-Queens
The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an integer n, return all distinct solutions to the n-queens puzzle. ...
分类:其他好文   时间:2014-10-28 20:03:53    阅读次数:245
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