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Algorithm to generate all possible permutations of a list?
Say I have a list of n elements, I know there are n! possible ways to order these elements. What is an algorithm to generate all possible orderings of this list? Example, I have list [a, b, c]. The algorithm would return [[a, b, c], [a, c, b,], [b, a, c], [b, c, a], [c, a, b], [c, b, a]].
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Why can't variable names start with numbers?
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It's a convention now, but it started out as a technical requirement.
In the old days, parsers of languages such as FORTRAN or BASIC did not require the uses of spaces. So, basically, the following are identical:
10 V1=100
20 PRINT V1
and
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REST vs JSON-RPC? [closed]
...ervice implementation without breaking clients:
Clients are required to know procedure names;
Procedure parameters order, types and count matters. It's not that easy to change procedure signatures(number of arguments, order of arguments, argument types etc...) on server side without breaking clien...
JRE 1.7 - java version - returns: java/lang/NoClassDefFoundError: java/lang/Object
... packages jdk-7u79-solaris-sparcv9.tar.Z and jdk-7u79-solaris-sparc.tar.Z. Now it looks like it is working. Ty.
– Alex Pi
Apr 1 '16 at 16:18
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How to build a jar using maven, ignoring test results? [duplicate]
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Anyone know why "-Dmaven.test.error.ignore=true" is not being used anymore? I finding the need to not ignore actual failures, but ignore errors (which may not actually cause the test to "fail") in some cases. Is there any way to di...
if (key in object) or if(object.hasOwnProperty(key)
...someMap.constructor will yield -> function Object() { [native code] }
Now, if you want to iterate through "someMap" you will have to do it this way:
const key
for(key in someMap ){
if (someMap.hasOwnProperty(key)) {
// Do something
}
}
We are doing so in order to avoid iterating over i...
How to change the pop-up position of the jQuery DatePicker control
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Same issue as the other css-trick: Only works if you now exactly where the datepicker should be in CSS. You cannot use this method to dynamically place the datepicker. I had to use a hack, binding on inst.input.focus()
– aaronbauman
Mar 18...
How does the algorithm to color the song list in iTunes 11 work? [closed]
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Pretty awesome solution. Now need a port from Mathematica to Objective-C, that is a hard struggle.
– loretoparisi
Dec 3 '12 at 20:29
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How to implement a ConfigurationSection with a ConfigurationElementCollection
...se "add" the default one but i changed it just for the sake of this post.
Now all of our nested Elements have been implemented now we should aggregate all of those in a class which has to implement System.Configuration.ConfigurationSection
CustomApplicationConfigSection
public class CustomApplica...
How to use the same C++ code for Android and iOS?
...d, it has improved a lot, so the answer is more understandable to everyone now.
Please take a look at the repo so you can download and run the code I'll show below.
The Answer
Before I show the code, please take a lot on the following diagram.
Each OS has its UI and peculiarities, so we intend...