https://issues.apache.org/jira/browse/HIVE-2340selectuserid,count(*)fromu_datagroupbyuseridorderbyuseridwillproductMRR.Ithinkwhentheresultofuserid,count(*)issmall(onereducecanprocesstheresult).ThisqueryplancanoptimizetoMR?Topreventbadreducermerging,thereduc..
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其他好文 时间:
2015-05-25 14:46:24
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124
Given an index k, return the kth row of the Pascal's triangle.
For example, given k = 3,Return [1,3,3,1].
Note:
Could you optimize your algorithm to use only O(k) extra space?
从后往前计算
//用一个数组滚...
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其他好文 时间:
2015-05-19 22:39:04
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151
Given an index k, return the kth row of the Pascal's triangle.
For example, given k = 3,
Return [1,3,3,1].
Note:
Could you optimize your algorithm to use only O(k) extra space?
基本思路:
内层循环,使用...
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其他好文 时间:
2015-05-17 16:51:36
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111
@echo offecho please input phpCB url:set /p input=cd /d "E:\tools\phpCB\"phpCB --space-after-if --optimize-eol --space-after-switch --space-after-whil...
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Web程序 时间:
2015-05-16 17:55:00
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274
Pascal's Triangle II
Given an index k, return the kth row of the Pascal's triangle.
For example, given k = 3,
Return [1,3,3,1].
Note:
Could you optimize your algorithm to use only O(k) ex...
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其他好文 时间:
2015-05-12 15:45:55
阅读次数:
143
Given an indexk, return thekthrow of the Pascal's triangle.For example, givenk= 3,Return[1,3,3,1].Note:Could you optimize your algorithm to use onlyO(...
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其他好文 时间:
2015-05-05 12:19:56
阅读次数:
152
pch中:#ifndef __OPTIMIZE__#define NSLog(...) NSLog(__VA_ARGS__)#else#define NSLog(...) {}#endif__OPTIMIZE__ 这个宏是用来标识是否是release的。选择edit scheme菜单项编辑 ,选择i...
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其他好文 时间:
2015-05-05 12:19:14
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139
题目:Given an indexk, return thekthrow of the Pascal's triangle.For example, givenk= 3,Return[1,3,3,1].Note:Could you optimize your algorithm to use onl...
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其他好文 时间:
2015-05-04 13:28:57
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115
hive.optimize.cp=true:列裁剪,取数只取
在读数据的时候,只读取查询中需要用到的列,而忽略其他列。例如,对于查询:SELECT a,b FROM T WHEREe
hive.optimize.prunner:分区裁剪
LIMIT
hive.limit.optimize.enable=true:优化LIMIT n语句
使用...
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其他好文 时间:
2015-04-25 00:17:57
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176
problem:
Given an index k, return the kth row of the Pascal's triangle.
For example, given k = 3,
Return [1,3,3,1].
Note:
Could you optimize your algorithm to use only O(k) extra spac...
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其他好文 时间:
2015-04-24 12:40:14
阅读次数:
151