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How to find the lowest common ancestor of two nodes in any binary tree?
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Nick Johnson is correct that a an O(n) time complexity algorithm is the best you can do if you have no parent pointers.) For a simple recursive version of that algorithm see the code in Kinding's post which runs in O(n) time.
But keep in min...
What is a build tool?
For past 4 years, I have been programming with Eclipse (for Java), and Visual Studio Express (for C#). The IDEs mentioned always seemed to provide every facility a programmer might ask for (related to programming, of course).
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How to check iOS version?
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The quick answer …
As of Swift 2.0, you can use #available in an if or guard to protect code that should only be run on certain systems.
if #available(iOS 9, *) {}
In Objective-C, you need to check the system version and perform a comparison.
[[NSProcessInfo processInfo] operatingSystemV...
Naming conventions: “State” versus “Status” [closed]
...relationships at a particular point in time (usually, current)
Status is more of a time-point, say, where something is at in a process or workflow - is it dirty (therefore requiring saving), is it complete, is it pending input, etc
I hope that helps you in your decision.
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What is an optional value in Swift?
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An optional in Swift is a type that can hold either a value or no value. Optionals are written by appending a ? to any type:
var name: String? = "Bertie"
Optionals (along with Generics) are one of the most difficult Swift concepts to understand. Because of how they are written and us...
What is a elegant way in Ruby to tell if a variable is a Hash or an Array?
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You can just do:
@some_var.class == Hash
or also something like:
@some_var.is_a?(Hash)
It's worth noting that the "is_a?" method is true if the class is anywhere in the objects ancestry tree. for instance:
@some_var.is_a?(Object) # => true
the above is tru...
What is the difference between NTFS Junction Points and Symbolic Links?
...n Points and Symbolic Links is that Junctions are only able to be directories, while SymLinks are allowed to also target files.
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Are duplicate keys allowed in the definition of binary search trees?
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Many algorithms will specify that duplicates are excluded. For example, the example algorithms in the MIT Algorithms book usually present examples without duplicates. It is fairly trivial to implement duplicates (either as a list a...
Is Python interpreted, or compiled, or both?
...d is not a property of the language but a property of the implementation. For most languages, most if not all implementations fall in one category, so one might save a few words saying the language is interpreted/compiled too, but it's still an important distinction, both because it aids understandi...
What are the differences between Autotools, Cmake and Scons?
...uly ARCANE m4 macro syntax combined with verbose, twisted shell scripting for tests for "compatibility", etc.
If you're not paying attention, you will mess up cross-compilation ability (It
should clearly be noted that Nokia came up with Scratchbox/Scratchbox2 to side-step highly broken Autotools bui...