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Big O, how do you calculate/approximate it?
... ^ 2 / 4 ) + C * N
f(N) = C * 1/4 * N ^ 2 + C * N
And the BigOh is:
O(N²)
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科大讯飞徐景明：从语音交互到人工智能 - 资讯 - 清泛网 - 专注C/C++及内核技术
...由中国人做到最好”的产业抱负，在平房里开始了艰苦的创业，有时中午只是蹲在地上随便吃盒盒饭，以至于来帮忙录音的广播电台的小姑娘说自己不像跟一群科学家在工作，反而像和民工一起……
现在看来，一切都值得。如...
Superscript in markdown (Github flavored)?
...eful ones are:
⁰ SUPERSCRIPT ZERO (U+2070)
¹ SUPERSCRIPT ONE (U+00B9)
² SUPERSCRIPT TWO (U+00B2)
³ SUPERSCRIPT THREE (U+00B3)
ⁿ SUPERSCRIPT LATIN SMALL LETTER N (U+207F)
People also often reach for <sup> and <sub> tags in an attempt to render specific symbols like these:
™...
互联网医疗新格局：顶级医生入场 - 资讯 - 清泛网 - 专注C/C++及内核技术
...其中之一。从2002年开始，李昊大学没毕业就开始在学校创业，是一个连续创业者，也是电子商务和网络营销的职业经理人。10多年来，他在互联网领域兜兜转转，同时也从事过医疗服务方面的工作，互联网和医疗方面的工作经历...
How many files can I put in a directory?
... answer, I know… but when you write EXT4 – Maximum number of files: 2³² - 1 (4,294,967,295) and Maximum number of files per directory: unlimited you really confused me because 2³² - 1 != “unlimited”. I guess I need a coffee now. ;) Nevertheless +1
– e-sushi
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Difference between single and double square brackets in Bash
...er command. Bash extension.
expr a \< b > /dev/null: POSIX equivalent², see: How to test strings for lexicographic less than or equal in Bash?
&& and ||
[[ a = a && b = b ]]: true, logical and
[ a = a && b = b ]: syntax error, && parsed as an AND command sep...
Get folder name from full file path
...red Mar 8 '11 at 6:53
Øyvind BråthenØyvind Bråthen
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Python int to binary string?
...nce it happens quite often that code that was written naïvely using an O(N²) algo and tested with a small data set quickly gets used with a much larger data set because "it seems to work". Then all of a sudden you have code that takes hours to run that when fixed may take only seconds. O(N²) algo...
PHP: How to remove all non printable characters in a string?
...es UTF8 characters fine; but it strips non-UTF8 "special" characters; like ç, ü and ö. '/[\x00-\x1F\x80-\xC0]/u'leaves them intact; but also division (F7) and multiplication (D7) sign.
– Hazar
May 9 '12 at 11:11
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Get the (last part of) current directory name in C#
...ot exactly what the question was about.
– Jakob Möllås
May 16 '11 at 13:47
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