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If strings are immutable in .NET, then why does Substring take O(n) time?
Given that strings are immutable in .NET, I'm wondering why they have been designed such that string.Substring() takes O( substring.Length ) time, instead of O(1) ?
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Faster way to develop and test print stylesheets (avoid print preview every time)?
...or Chrome >51:
https://developers.google.com/web/tools/chrome-devtools/settings?hl=en#emulate-print-media
To view a page in print preview mode, open the DevTools main menu, select More Tools > Rendering Settings, and then enable the emulate media checkbox with the dropdown menu set to pri...
Writing a compiler in its own language
... following. You write a minimal compiler in assembler (yuck) for a minimal set of the language and then use that compiler to implement extra features of the language. Building your way up until you have a compiler with all the language features for itself. A painful process that is usually only done...
Does pandas iterrows have performance issues?
...ion is ALWAYS, ALWAYS the first and best choice. However, there is a small set of cases (usually involving a recurrence) which cannot be vectorized in obvious ways. Furthermore, on a smallish DataFrame, it may be faster to use other methods.
3) apply usually can be handled by an iterator in Cython ...
Mysql ibdata 丢失或损坏如何通过frm&ibd 恢复数据 - 爬虫/数据库 - 清...
...除了，或者ibdata损坏了怎么办呢？别担心，只要有部分的frm、ibd存在就可以恢复部分数据。注意：
一、这个是对innodb的数据恢复。myisam不需要这么麻烦，只要数据文件存在直接复制过去就可以。
二、大家的mysql数据库必须是按...
Cron job every three days
...ated by requiring the introduction of the concept of when such patterns "reset". For example, is the pattern reset when the time is changed (i.e. the crontab entry is revised)? Look to your favorite calendar app to see how complicated it can get to express Repeating patterns of scheduled events, a...
Javascript heredoc
..., it is deleting whitespace and comments. I can't figure out if this is a setting, but it is definitely on the client side. Any ideas for a workaround?
– MLU
Dec 29 '14 at 16:16
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Round to at most 2 decimal places (only if necessary)
I'd like to round at most 2 decimal places, but only if necessary .
79 Answers
79
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Which is the fastest algorithm to find prime numbers?
...sieving ranges for SoA than for SoE, but that gain is usually more than offset by the increased complexity and the extra constant factor overhead of this computational complexity such that for practical applications the SoE is better.
– GordonBGood
Mar 20 '14 a...
How can I change the color of a part of a TextView?
... "\n\n"
+ getText(R.string.currentversion) + CepVizyon.getLicenseText();
Spannable spannable = new SpannableString(text2);
spannable.setSpan(new ForegroundColorSpan(Color.WHITE), text.length(), (text + CepVizyon.getPhoneCode()).length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
myTextView...