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Computational complexity of Fibonacci Sequence

...ll have depth n and intuitively figure out that this function is asymptotically O(2n). You can then prove your conjecture by induction. Base: n = 1 is obvious Assume T(n-1) = O(2n-1), therefore T(n) = T(n-1) + T(n-2) + O(1) which is equal to T(n) = O(2n-1) + O(2n-2) + O(1) = O(2n) However, as ...
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Archives not showing up in Organizer for Xcode 4

... EDIT (Incorporated all comments to a single answer) Try one of the following (or all) Instead of using Build For -> Archive, in the product menu just use archive. It will show up then. In the scheme editor, edit the scheme and go to the A...
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What is the difference between a .xib file and a .storyboard?

...ated .xib with it. Storyboard achieves two things: .storyboard is essentially one single file for all your screens in the app and it shows the flow of the screens. You can add segues/transitions between screens, this way. So, this minimizes the boilerplate code required to manage multiple screens....
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How to determine if a number is odd in JavaScript

... yea good note about the NaN. But usually, you want javascript to be truthy or falsey, which is why i wrote it the way i did. – Chii Feb 16 '11 at 12:24 ...
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Why am I suddenly getting a “Blocked loading mixed active content” issue in Firefox?

... main page is served over HTTPS. When an HTTPS page has HTTP content, we call that content “mixed”. The webpage that the user is visiting is only partially encrypted, since some of the content is retrieved unencrypted over HTTP. The Mixed Content Blocker blocks certain HTTP requests on HTTPS p...
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What is offsetHeight, clientHeight, scrollHeight?

... To know the difference you have to understand the box model, but basically: clientHeight: returns the inner height of an element in pixels, including padding but not the horizontal scrollbar height, border, or margin offsetHeight: is a measurement which includes the element borders, ...
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Simple explanation of clojure protocols

...eployed, separately type checked. We want them to be type-safe. [Note: not all of these make sense in all languages. But, for example, the goal to have them type-safe makes sense even in a language like Clojure. Just because we can't statically check type-safety doesn't mean that we want our code to...
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Why doesn't ruby support method overloading?

...; end; # second argument has a default value method(10) # Now the method call can match the first one as well as the second one, # so here is the problem. So ruby needs to maintain one method in the method look up chain with a unique name. ...
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Getting all types that implement an interface

Using reflection, how can I get all types that implement an interface with C# 3.0/.NET 3.5 with the least code, and minimizing iterations? ...
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How to permanently add a private key with ssh-add on Ubuntu? [closed]

...e chmod 600. You can use the command chmod 600 ~/.ssh/config. If you want all users on the computer to use the key put these lines into /etc/ssh/ssh_config and the key in a folder accessible to all. Additionally if you want to set the key specific to one host, you can do the following in your ~/.s...