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Can hash tables really be O(1)?
...f your objects are variable size and an equality check requires looking at all bits then performance will become O(m). The hash function however does not have to be O(m) - it can be O(1). Unlike a cryptographic hash, a hash function for use in a dictionary does not have to look at every bit in the i...
How do I decode a string with escaped unicode?
I'm not sure what this is called so I'm having trouble searching for it. How can I decode a string with unicode from http\u00253A\u00252F\u00252Fexample.com to http://example.com with JavaScript? I tried unescape , decodeURI , and decodeURIComponent so I guess the only thing left is string r...
How to find the Git commit that introduced a string in any branch?
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You can do:
git log -S <whatever> --source --all
To find all commits that added or removed the fixed string whatever. The --all parameter means to start from every branch and --source means to show which of those branches led to finding that commit. It's often usefu...
Java: notify() vs. notifyAll() all over again
If one Googles for "difference between notify() and notifyAll() " then a lot of explanations will pop up (leaving apart the javadoc paragraphs). It all boils down to the number of waiting threads being waken up: one in notify() and all in notifyAll() .
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CleanWPPAllFilesInSingleFolder error makes my project no longer load
Using VS2012 I created a dynamic data project. It all worked and then I started configuring the web deployment settings. I am not sure what setting I changed exactly as there was no error. However when I try and load the solution I get the following error for the project and it will no longer load.
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background:none vs background:transparent what is the difference?
...peat
background-attachment
background-position
That's mean, you can group all styles in one, like:
background: red url(../img.jpg) 0 0 no-repeat fixed;
This would be (in this example):
background-color: red;
background-image: url(../img.jpg);
background-repeat: no-repeat;
background-attachment: fi...
Why can't C# interfaces contain fields?
For example, suppose I want an ICar interface and that all implementations will contain the field Year . Does this mean that every implementation has to separately declare Year ? Wouldn't it be nicer to simply define this in the interface?
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Exception.Message vs Exception.ToString()
...ntaining the exception type, the message (from before), a stack trace, and all of these things again for nested/inner exceptions. More precisely, the method returns the following:
ToString returns a representation of the current exception that is intended to be understood by humans. Where the excep...
How to create a file in memory for user to download, but not through server?
...h the server?
I know I can't write directly to their machine (security and all), but can I create and prompt them to save it?
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Unzipping files in Python
...t understand how to unzip a file, only how to zip a file. How do I unzip all the contents of a zip file into the same directory?
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