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TEZ MRR optimize to MR?
https://issues.apache.org/jira/browse/HIVE-2340selectuserid,count(*)fromu_datagroupbyuseridorderbyuseridwillproductMRR.Ithinkwhentheresultofuserid,count(*)issmall(onereducecanprocesstheresult).ThisqueryplancanoptimizetoMR?Topreventbadreducermerging,thereduc..
分类:其他好文   时间:2015-05-25 14:46:24    阅读次数:124
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) extra space? 从后往前计算 //用一个数组滚...
分类:其他好文   时间:2015-05-19 22:39:04    阅读次数:151
Pascal's Triangle II -- leetcode
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...
分类:其他好文   时间:2015-05-17 16:51:36    阅读次数:111
PHP代码格式化批量脚本
@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...
分类:Web程序   时间:2015-05-16 17:55:00    阅读次数:274
[LeetCode] Pascal's Triangle II
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...
分类:其他好文   时间:2015-05-12 15:45:55    阅读次数:143
(leetcode)Pascal's Triangle II
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(...
分类:其他好文   时间:2015-05-05 12:19:56    阅读次数:152
预处理消除NSLog
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...
分类:其他好文   时间:2015-05-05 12:19:14    阅读次数:139
LeetCode OJ:Pascal's Triangle II
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...
分类:其他好文   时间:2015-05-04 13:28:57    阅读次数:115
hive的使用和优化笔记
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...
分类:其他好文   时间:2015-04-25 00:17:57    阅读次数:176
leetcode || 119、Pascal's Triangle II
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...
分类:其他好文   时间:2015-04-24 12:40:14    阅读次数:151
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