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How to find the kth largest element in an unsorted array of length n in O(n)?
...A2.
Let's guess that T(n) <= an for some a. Then we get
T(n)
<= cn + (1/n) ∑i=1 to nT(max(i-1, n-i))
= cn + (1/n) ∑i=1 to floor(n/2) T(n-i) + (1/n) ∑i=floor(n/2)+1 to n T(i)
<= cn + 2 (1/n) ∑i=floor(n/2) to n T(i)
<= cn + 2 (1/n) ∑i=floor(n/2) to n ai
and now somehow w...
How do you run a SQL Server query from PowerShell?
...Hub so that you can now go to your modules directory and execute git clone https://github.com/ChrisMagnuson/InvokeSQL and from that point forward invoke-sql will automatically be loaded when you go to use it (assuming your using PowerShell v3 or later).
...
由12306.cn谈谈网站性能技术 - 更多技术 - 清泛网 - 专注C/C++及内核技术
由12306.cn谈谈网站性能技术12306.cn网站挂了，被全国人民骂了。我这两天也在思考这个事，我想以这个事来粗略地和大家讨论一下网站性能的问题。因为仓促，而且完全基于...12306.cn网站挂了，被全国人民骂了。我这两天也在思考...
Why is Maven downloading the maven-metadata.xml every time?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Calculating moving average
...comment from @Ricardo Cruz:
cx <- c(0, cumsum(ifelse(is.na(x), 0, x)))
cn <- c(0, cumsum(ifelse(is.na(x), 0, 1)))
rx <- cx[(n+1):length(cx)] - cx[1:(length(cx) - n)]
rn <- cn[(n+1):length(cx)] - cn[1:(length(cx) - n)]
rsum <- rx / rn
This still has the issue that if all the values ...
Simplest way to detect a mobile device in PHP
...10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1...
How can I create a self-signed cert for localhost?
I've gone through the steps detailed in How do you use https / SSL on localhost? but this sets up a self-signed cert for my machine name, and when browsing it via https://localhost I receive the IE warning.
...
Python equivalent of D3.js
...dated more recently. Though the examples are all static D3.
more info:
https://github.com/wrobstory/vincent
https://pypi.python.org/pypi/vincent/0.1.6
The graphs can be viewed in Ipython, just add this code
vincent.core.initialize_notebook()
Or output to JSON where you can view the JSON o...
keytool error :java.io.IoException:Incorrect AVA format
...PatrickTaylor -validity 10000
-keystore C:\drops\patrickkeystore
-dname "cn=Patrick Taylor, ou=engineering, o=company, c=US"
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App Inventor 2 中文网已全面升级https安全通道，数据安全有保障！ - App I...
...段时间的努力，App Inventor 2 中文网（fun123.cn）已全部升级https安全通道，以保护用户的访问及数据安全，值得注意的是MIT官方目前仍是http非安全通道。
App Inventor 2 中文网（fun123.cn）安全通道
MIT官方目前非安全通道
这...