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leetcode || 78、Subsets
problem: Given 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 not contain duplicate sub...
分类:其他好文   时间:2015-04-10 11:35:42    阅读次数:181
LeetCode:Rank Scores
做到这题时卡了不少时间,参考了别人的解法,觉得挺不错的,还挺巧妙。 SELECT s2.Score,s1.Rank From ( SELECT S1.Score, COUNT(*) as Rank FROM (SELECT DISTINCT Score from Scores) as S1, (SE...
分类:其他好文   时间:2015-04-09 21:24:36    阅读次数:160
Climbing Stairs -- leetcode
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? 此题用动太规划解决。 递归式为:dp[n] = dp[...
分类:其他好文   时间:2015-04-09 08:49:52    阅读次数:104
leetcode || 70、 Climbing Stairs
problem: 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? Hide Tag...
分类:其他好文   时间:2015-04-08 13:18:01    阅读次数:117
LeetCode Subsets
Given 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 not contain duplicate subsets. For exa...
分类:其他好文   时间:2015-04-07 21:38:13    阅读次数:138
Oracle知识关键字
创建表:create ;删除表:drop;查询:select;增加:insert into ;删除列:delect;修改:update;分组:group by;表连接:join、left join、right join、cross join;去除重复:distinct;表连接过滤:having;视图...
分类:数据库   时间:2015-04-07 19:30:33    阅读次数:184
RDD api整理
RDD[T]Transformations rdd api 备注 persist/cache map(f: T => U) keyBy(f: T => K) 特殊的map,提key flatMap(f: T => Iterable[U]) map的一种,类似UDTF filter(f: T => Boolean) map的一种 distinct(...
分类:Windows程序   时间:2015-04-07 17:39:29    阅读次数:212
LINQ标准查询操作符(三)——Aggregate、Average、Distinct、Except、Intersect、Union、Empty、DefaultIfEmpty、Range、Repeat
本文来自:http://blog.csdn.net/xuejianwu/article/details/6931903七、聚合操作符聚合函数将在序列上执行特定的计算,并返回单个值,如计算给定序列平均值、最大值等。共有7种LINQ聚合查询操作符:Aggregate、Average、Count、Long...
分类:其他好文   时间:2015-04-07 17:29:17    阅读次数:230
Leetcode---Subsets
Given 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 not contain duplicate subsets. For exam...
分类:其他好文   时间:2015-04-07 10:05:03    阅读次数:127
LeetCode78/90 subset I/II
一:Unique paths I 题目: Given 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 not contain duplic...
分类:其他好文   时间:2015-04-06 15:44:07    阅读次数:122
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