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Obtaining a powerset of a set in Java
...shSet<T>());
return sets;
}
List<T> list = new ArrayList<T>(originalSet);
T head = list.get(0);
Set<T> rest = new HashSet<T>(list.subList(1, list.size()));
for (Set<T> set : powerSet(rest)) {
Set<T> newSet = new HashSet&l...
Can hash tables really be O(1)?
...yway.
Not necessarily. The buckets don't necessarily have to be lists or arrays, they can be any container type, such as a balanced BST. That means O(log n) worst case. But this is why it's important to choose a good hashing function to avoid putting too many elements into one bucket. As KennyTM p...
How do I sort a vector of pairs based on the second element of the pair?
...e type of the returned expression after lvalue-to-rvalue conversion (4.1), array-to-pointer conversion (4.2), and function-to-pointer conversion (4.3);
otherwise, void.
To explicitly specify the return type use the form []() -> Type { }, like in:
sort(v.begin(), v.end(),
[](const pai...
GMSGroundOverlay animating - should I be using a CATiledLayer?
...eypaths separately.
First calculate the points and add them to 2 separate arrays, one for latitude value (y) and one for longitude (x) and then use the values property in CAKeyFrameAnimation to animate. Create 2 CAKeyFrameAnimation objects (1 for each axis) and group them together using CAAnimation...
Changing the image source using jQuery
...in.
jsFiddle example with 3 images
You can also store the srcs in an array.
jsFiddle example with 3 images
And here's how to incorporate the hrefs from the anchor tags around the images:
jsFiddle example
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How to remove a lua table entry by its key?
...s standard. However, I'd recommend not overriding table.remove() - for the array portion of a table, the default table.remove() functionality includes renumbering the indices, which your override would not do. If you do want to add your function to the table function set, then I'd probably name it s...
Reloading the page gives wrong GET request with AngularJS HTML5 mode
...,
middleware: function(connect, options) {
// Return array of whatever middlewares you want
return [
// redirect all urls to index.html in build folder
urlRewrite('build', 'index.html'),
// Serve static files.
...
Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
...ore convenient to have the upper bits zeroed, so you can use a value as an array index (because all regs have to be the same size in an effective address: [rsi + edx] isn't allowed). Of course avoiding false dependencies / partial-register stalls (the other answer) is another major reason.
...
CSS filter: make color image with transparency white
...idth, canvas.height);
/*
imgData.data is a one-dimensional array which contains
the respective RGBA values for every pixel
in the selected region of the context
(note i+=4 in the loop)
*/
for (var i = 0; i < imgData.data.length; i+=4) {
imgDat...
Boolean literals in PowerShell
...s. Most non-null objects are true, for example. null, empty strings, empty arrays and the number 0 are false.
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