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[LeetCode] Climbing Stairs 斐波那契数列
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:2015-01-08 14:42:31    阅读次数:160
leetcode----------Climbing Stairs
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:2015-01-08 13:14:25    阅读次数:119
oracle数据库常用的99条查询语句(转载)
1. select * from emp;2. select empno, ename, job from emp;3. select empno 编号, ename 姓名, job 工作 from emp;4. select job from emp;5. select distinct job ...
分类:数据库   时间:2015-01-07 18:30:36    阅读次数:236
最长上升子序列算法
这题目是经典的DP题目,也可叫作LIS(Longest Increasing Subsequence)最长上升子序列 或者 最长不下降子序列。很基础的题目,有两种算法,复杂度分别为O(n*logn)和O(n^2) 。A.O(n^2)算法分析如下:(a[1]...a[n] 存的都是输入的数)1、对于a...
分类:编程语言   时间:2015-01-07 18:26:49    阅读次数:280
MySQL函数GROUP_CONCAT
MySQL字段连接函数GROUP_CONCAT 该函数返回带有来自一个组的连接的非NULL值的字符串结果。该函数是一个增强的Sybase SQL Anywhere支持的基本LIST()函数。 语法结构: GROUP_CONCAT([DISTINCT] expr [,expr ...] [ORD...
分类:数据库   时间:2015-01-07 12:51:07    阅读次数:274
[leetcode] Subsets
SubsetsGiven a set of distinct integers,S, return all possible subsets.Note:Elements in a subset must be in non-descending order.The solution set must...
分类:其他好文   时间:2015-01-06 19:48:38    阅读次数:143
mysql distinct关键字在多个字段的情况下出现行为怪异的问题
mysql distinct
分类:数据库   时间:2015-01-06 13:38:17    阅读次数:168
[LeetCode] Longest Substring with At Most Two Distinct Characters及扩展
Given a string, find the length of the longest substring T that contains at most 2 distinct characters. For example, Given s = “eceba”, T is "ece" which its length is 3. 这题的线性解法是维护一个sliding w...
分类:其他好文   时间:2015-01-06 07:20:32    阅读次数:121
数据查询和管理
对数据表的插入、更新、删除操作 --数据查询和管理--取消重复元组distinctselect distinct 民族 from 学生信息go--查询前几列数据select top 6 * from 学生信息select top 6 学号,姓名,民族 from 学生信息go--查询计算列sele.....
分类:其他好文   时间:2015-01-06 00:42:51    阅读次数:231
[leetcode]Distinct Subsequences
问题描述: Given a string S and a string T, count the number of distinct subsequences of T in S. A subsequence of a string is a new string which is formed from the original string by deleting some...
分类:其他好文   时间:2015-01-05 21:58:33    阅读次数:185
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