Given a strings1, we may represent it as a
binary tree by partitioning it to two non-empty substrings recursively.Below is
one possible representation...
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其他好文 时间:
2014-05-26 11:24:36
阅读次数:
214
二次型$\bf计算1:$求实二次型$f(x_1,\cdots,x_n)=\sum\limits_{i=1}^n(x_i-\sum\limits_{j=1}^n\dfrac{x_j}{n})^2$的矩阵及正负惯性指数参考答案$\bf计算2:$
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其他好文 时间:
2014-05-26 10:25:45
阅读次数:
172
原文地址:http://antirez.com/news/52Hello! As
promised today I did some SSD testing.The setup: a Linux box with 24 GB of RAM,
with two disks.A) A spinning ...
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其他好文 时间:
2014-05-26 10:24:56
阅读次数:
427
Given an array S of n integers, find three
integers in S such that the sum is closest to a given number, target. Return the
sum of the three integers....
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其他好文 时间:
2014-05-26 09:58:20
阅读次数:
220
Time Limit: 2000/1000 MS (Java/Others) Memory
Limit: 65536/32768 K (Java/Others) Total Submission(s): 137169 Accepted
Submission(s): 31787 Problem Des...
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其他好文 时间:
2014-05-26 07:37:31
阅读次数:
314
原地踏步了半年,感觉一切都陌生了~题意:a[i]-一个任意的数,这个数要等于a[1]~a[i-1]每个数减去任意一个数,经过多次这样的变换到达目标b序列,能到达就yes不能到达距no.一开始各种分析,所有的差的和必须是偶数,sum(cha[1~i-1])>=cha[i](其中cha[i]=a[i]-...
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其他好文 时间:
2014-05-26 07:09:20
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231
Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have
exact...
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其他好文 时间:
2014-05-25 00:46:51
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229
Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume
that each input would have exact...
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其他好文 时间:
2014-05-24 20:43:37
阅读次数:
341
题目描述If the difference between any two adjancent
elements in a sequence is not more than K, then we call this sequence is a
K-diff sequence. A subseque...
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其他好文 时间:
2014-05-24 09:39:27
阅读次数:
340
在Mongodb的查询中,有类似于SQL中group
by功能的group函数.两者的功能有些类似,但是区别也是比较明显的.对于SQL来说,group
by的作用就是安装依据列来将数据表中的记录分成一个个的组,而查询结果中,只能Select出来Group BY中含有的列,或者使用了聚合函数(sum,...
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数据库 时间:
2014-05-24 09:20:01
阅读次数:
251