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How do BitTorrent magnet links work?

For the first time I used a magnet link . Curious about how it works, I looked up the specs and didn't find any answers. The wiki says xt means "exact topic" and is followed by the format ( btih in this case) with a SHA1 hash. I saw base32 mentioned, knowing it's 5 bits per character and 32 char...
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Private vs Protected - Visibility Good-Practice Concern [closed]

... No, you're not on the right track. A good rule of thumb is: make everything as private as possible. This makes your class more encapsulated, and allows for changing the internals of the class without affecting the code using your class. If you design your class to be inherita...
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Explain the use of a bit vector for determining if all characters are unique

I am confused about how a bit vector would work to do this (not too familiar with bit vectors). Here is the code given. Could someone please walk me through this? ...
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How do popular apps authenticate user requests from their mobile app to their server?

...e confusion that I have is regarding how to sign-up/login the user first time and authenticate it every time they make a request to the API. ...
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How to upload a file in Django? [closed]

As a newbie to Django, I am having difficulty making an upload app in Django 1.3. I could not find any up-to-date example/snippets. May someone post a minimal but complete (Model, View, Template) example code to do so? ...
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Vertical (rotated) text in HTML table

Is there a (portable) way to rotate text in a HTML table cell by 90°? 11 Answers 11 ...
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How to implement a ViewPager with different Fragments / Layouts

When I start an activity which implements viewpager, the viewpager created various fragments. I want to use different layouts for each fragment, but the problem is that viewpager shows only two layouts at the max (second layout on all of the remaining fragments after 1). ...
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Why Choose Struct Over Class?

Playing around with Swift, coming from a Java background, why would you want to choose a Struct instead of a Class? Seems like they are the same thing, with a Struct offering less functionality. Why choose it then? ...
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How do I obtain a Query Execution Plan in SQL Server?

In Microsoft SQL Server how can I get a query execution plan for a query / stored procedure? 12 Answers ...
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What are the rules for evaluation order in Java?

I am reading some Java text and got the following code: 5 Answers 5 ...