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...
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其他好文 时间:
2015-04-10 11:35:42
阅读次数:
181
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...
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其他好文 时间:
2015-04-09 21:24:36
阅读次数:
160
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[...
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其他好文 时间:
2015-04-09 08:49:52
阅读次数:
104
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?
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其他好文 时间:
2015-04-08 13:18:01
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117
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...
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其他好文 时间:
2015-04-07 21:38:13
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138
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...
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数据库 时间:
2015-04-07 19:30:33
阅读次数:
184
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(...
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...
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其他好文 时间:
2015-04-07 17:29:17
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230
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...
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其他好文 时间:
2015-04-07 10:05:03
阅读次数:
127
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