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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...
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Any reason why scala does not explicitly support dependent types?

...plicated that it is hard to see the laws, the value level expressions are converted (automatically but still) to type level things and you need to trust that conversion as well. There is room for error in all of this which kinda defies the purpose of compiler acting as a proof assistant. (EDITE...
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How to use if-else option in JSTL

...prefix="c" uri="http://www.springframework.org/tags/form"%> and <c:select> <option value="RCV" ${records[0].getDirection() == 'RCV' ? 'selected="true"' : ''}> <spring:message code="dropdown.Incoming" text="dropdown.Incoming" /> ...
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How to delete a module in Android Studio

...ed via "File -> Project Structure" or by right-clicking on a Module and selecting "Module Settings". Then select the module, and click the "minus" button to remove it. The directory will still be visible in the "Project" view (though not in the "Android" view) since it's not actually delete...
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How do I check/uncheck all checkboxes with a button using jQuery?

...ecking/unchecking the parent checkbox all the child checkboxes are getting selected/deselected also with the text of parent checkbox getting changed to checkall/uncheckall. ...
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How can I make the Android emulator show the soft keyboard?

... time I try to do it, it resets itself! I click New... Hardware property, select Keyboard Support, change the value to 'no', click edit/create, but when I edit it again or get info: Hardware Keyboard = yes! Ha! I can't express how sublime I find the Android emulator. – blahd...
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ViewBag, ViewData and TempData

...Test1"); } public ActionResult Test1() { string Str = Convert.ToString(TempData["T"]); TempData.Keep(); // Keep TempData return RedirectToAction("Test2"); } public ActionResult Test2() { string Str = Convert.ToString(TempData["T"]); //OutPut ...
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Elegant way to combine multiple collections of elements?

...in a collection (e.g., of type List<List<int>> , I could use SelectMany to combine them all into one collection. ...
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How to install both Python 2.x and Python 3.x in Windows

...ed Python 2.7.6. How to... Start > in the search type in environment select "Edit environment variables to your account"1 Scroll down to Path, select path, click edit. Add C:\Python27; so you should have paths to both versions of Python there, but if you don't this you can easily edit it so th...
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How to make an OpenGL rendering context with transparent background?

... @datenwolf I originally was asking for assistance but I succeeded in converting your code to modern OpenGL. I will post my solution here in a bit for future reference. – syk435 Jan 2 '14 at 8:27 ...