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What would cause an algorithm to have O(log n) complexity?
...imes can you divide n by two before you get a number less than or equal to one? For 16, we have that
16 / 2 = 8
8 / 2 = 4
4 / 2 = 2
2 / 2 = 1
Notice that this ends up taking four steps to complete. Interestingly, we also have that log2 16 = 4. Hmmm... what about 128?
128 / 2 = 64
64 / 2 ...
What are all the uses of an underscore in Scala?
...
The ones I can think of are
Existential types
def foo(l: List[Option[_]]) = ...
Higher kinded type parameters
case class A[K[_],T](a: K[T])
Ignored variables
val _ = 5
Ignored parameters
List(1, 2, 3) foreach { _ =>...
GroupBy pandas DataFrame and select most common value
I have a data frame with three string columns. I know that the only one value in the 3rd column is valid for every combination of the first two. To clean the data I have to group by data frame by first two columns and select most common value of the third column for each combination.
...
How can I do a case insensitive string comparison?
... string is better practice than String since it is a language keyword. For one, String could be something other than System.String, whereas string cannot be. Also, string is more or less guaranteed to exist in C#, whereas String is technically part of .NET rather than C#.
– Dav...
Does const mean thread-safe in C++11?
... to say on thread-safety:
[1.10/4]
Two expression evaluations conflict if one of them modifies a memory location (1.7) and the other one accesses or modifies the same memory location.
[1.10/21]
The execution of a program contains a data race if it contains two conflicting actions in different threa...
Switching the order of block elements with CSS [duplicate]
Let's say my HTML is already set in stone:
11 Answers
11
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Python: split a list based on a condition?
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@dansalmo Especially since you can make it a one-liner with the for-cycle, and if you wanted to append something more complicated than x, you can make it into one append only: for x in mylist: (good if isgood(x) else bad).append(x)
– yo'
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Can I recover a branch after its deletion in Git?
...to recreate the branch from there.
Credit to @Cascabel for this condensed/one-liner version.
You can do it in one step:
git checkout -b <branch> <sha>
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Instance variables vs. class variables in Python
I have Python classes, of which I need only one instance at runtime, so it would be sufficient to have the attributes only once per class and not per instance. If there would be more than one instance (which won't happen), all instance should have the same configuration. I wonder which of the follow...
Git status ignore line endings / identical files / windows & linux environment / dropbox / mled
...or git. Try using bitbucket (it have free private repositories), just make one small repo and test on your 2 machines with some small text files.
– Saša Šijak
Dec 13 '13 at 9:11
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