大约有 40,000 项符合查询结果（耗时：0.0515秒） [XML]
Data structure: insert, remove, contains, get random element, all at O(1)
...o other solutions).
The requirement that's tricky is the "random element" selection: in a hash table, you would need to scan or probe for such an element.
For closed hashing / open addressing, the chance of any given bucket being occupied is size() / capacity(), but crucially this is typically kep...
Using crontab to execute script every minute and another every 24 hours [closed]
... runs as the user who submitted it. If you want to run a cron job as a non-root user, you should use the crontab command to submit it (and not worry about where the crontab is stored). Don't mess around with /etc/crontab unless you really need to.
– Keith Thompson
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gitignore all files of extension in directory
...e prefer having all this information in one .gitignore file stored at repo root directory.
– haren
Mar 24 '16 at 15:58
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Can CSS detect the number of children an element has?
...i:first-child:nth-last-child(4) ~ li {
width: 25%;
}
The trick is to select the first child when it's also the nth-from-the-last child. This effectively selects based on the number of siblings.
Credit for this technique goes to André Luís (discovered) & Lea Verou (refined).
Don't you j...
Can multiple different HTML elements have the same ID if they're different elements?
...into problems being able to work with these elements from JS, pass them as selectors to libraries/APIs/Flash, etc.
– mrooney
May 13 '13 at 20:55
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java.lang.IllegalArgumentException: View not attached to window manager
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Instead of blindly catching all exceptions, this solution addresses the root of the problem: trying to dimiss a dialog when the activity used to initialize the dialog has already been finished. Working on my Nexus 4 running KitKat, but should work for all versions of Android.
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Convert line-endings for whole directory tree (Git)
...license - print the SFK license text
help by subject
sfk help select - how dirs and files are selected in sfk
sfk help options - general options reference
sfk help patterns - wildcards and text patterns within sfk
sfk help chain - how to combine (chain) multiple ...
How to clear variables in ipython?
...r @ErdemKAYA comment.
To erase a variable, use the magic command:
%reset_selective <regular_expression>
The variables that are erased from the namespace are the one matching the given <regular_expression>.
Therefore
%reset_selective -f a
will erase all the variables containing a...
CSS @font-face not working with Firefox, but working with Chrome and IE
...g locally, then this will probably not solve that, but you may want to use root-based paths on a live site anyway, that is, "/resources/font" instead of relative ones such as "../font", but i don't know about thumblr: if you can give out the url for the site i can give it a look.
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How do you get git to always pull from a specific branch?
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@ianj: In the Git config file (from the repo root, .git/config).
– mipadi
Dec 17 '10 at 17:10
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