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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 cli...
分类:其他好文   时间:2014-11-29 07:04:53    阅读次数:187
SQLserv单表查询
作者: gw------------------------数据查询------------------------------select [all|distinct][,]...--from [,]...--where --[group by [having]]--[group by [asc|...
分类:数据库   时间:2014-11-28 21:18:35    阅读次数:255
使用max聚合函数去重
问题:jsmonth,bosscode,rewarditemid,TelNo,rewardsum这5个字段都相同即可确定这两行是重复的记录,但是计算的时候又必须用到这一行的datetime这个字段于是,首先使用select distinct jsmonth,bosscode,rewarditemid...
分类:其他好文   时间:2014-11-28 19:56:02    阅读次数:190
码字定式之SQL(4)
一些子查询select empno, ename from emp where mgr in(select empno from emp where job='MANAGER');select * from dept where deptno not in (select distinct dept...
分类:数据库   时间:2014-11-27 12:43:05    阅读次数:268
码字定式之SQL(4)
一些子查询select empno, ename from emp where mgr in(select empno from emp where job='MANAGER');select * from dept where deptno not in (select distinct dept...
分类:数据库   时间:2014-11-27 12:18:58    阅读次数:125
Leetcode-N-Queens II
Follow up for N-Queens problem.Now, instead outputting board configurations, return the total number of distinct solutions.Solution:The same as N-Quee...
分类:其他好文   时间:2014-11-26 23:56:59    阅读次数:250
MYSQL group_concat() 函数
看来看一下表中的数据select * from t; 下一步来看一下group_concat函数的用法select ID,group_concat(Name) from t group by ID; 如果要消除重复项可以加distinct select ID,gro...
分类:数据库   时间:2014-11-26 18:08:50    阅读次数:184
[leetcode]Longest Substring with At Most Two Distinct Characters
很明显的2 pointer问题。。。当满足条件的时候后面的指针加,不满足条件的时候前面的指针加,直到满足条件。。。class Solution {public: int lengthOfLongestSubstringTwoDistinct(string s) { int sta...
分类:其他好文   时间:2014-11-26 16:10:45    阅读次数:336
[LeetCode] Climbing Sairs
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:2014-11-26 14:01:07    阅读次数:165
Leetcode-Distinct Subsequences
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 th...
分类:其他好文   时间:2014-11-26 13:37:24    阅读次数:123
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