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What are the differences between NP, NP-Complete and NP-Hard?
...se definitions.
Decision problem: A problem with a yes or no answer.
Now, let us define those complexity classes.
P
P is a complexity class that represents the set of all decision problems that can be solved in polynomial time.
That is, given an instance of the problem, the answer yes or no...
How do I uninstall nodejs installed from pkg (Mac OS X)?
I installed NodeJS from pkg file on my Mac. Now I need to uninstall it. Tell me please how to do it.
I tried to remove files from this list:
...
Characters allowed in a URL
Does anyone know the full list of characters that can be used within a GET without being encoded? At the moment I am using A-Z a-z and 0-9... but I am looking to find out the full list.
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Test if executable exists in Python?
... write it (I admit my formulation was not clear enough in the fact that I know what which does).
– Piotr Lesnicki
Dec 18 '08 at 12:48
1
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Detect if a page has a vertical scrollbar?
...a solution that "just works" (cough). The algorithm I have come up with is now part of a plugin, jQuery.isInView, which exposes a .hasScrollbar method. Have a look at the source if you wish.
In a scenario where you are in full control of the page and don't have to deal with unknown CSS, using a pl...
Why are exclamation marks used in Ruby methods?
...downcase, but no change in value of foo.
=> foo #call the variable foo now.
"BEST DAY EVER" #variable is unchanged.
=> foo.downcase! #call destructive version.
=> foo #call the variable foo now.
"best day ever" #variable has been mutated in place.
But if you ever called a method down...
Does .asSet(…) exist in any API?
...
Now with Java 8 you can do this without need of third-party framework:
Set<String> set = Stream.of("a","b","c").collect(Collectors.toSet());
See Collectors.
Enjoy!
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Display clearColor UIViewController over UIViewController
...rying to make UIView as a clearColor not black background. Does anybody know what is wrong with it? Any suggestion appreciated.
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Failed to load c++ bson extension
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I was unable to solve this
until now. First of all you have to have system packages mentioned by Pradeep Mahdevu. Those are:
xcode-select --install (on a mac)
or
sudo apt-get install gcc make build-essential (on ubuntu)
Then I've installed node-gyp
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Why would one use nested classes in C++?
... have some material like Programming Principles and things like this IBM Knowledge Center - Nested Classes
4 Answers
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