大约有 40,000 项符合查询结果（耗时：0.0300秒） [XML]
How can you encode a string to Base64 in JavaScript?
...Phone3G with iOS 4.1. It does work on the simulator iPhone simulator when set to iPhone4 or iPhone.
– Grant M
Sep 15 '10 at 8:38
29
...
Big-O for Eight Year Olds? [duplicate]
...are more items. And an O(n) operation would mean that you would perform a set of operations on each element. Could somebody fill in the blanks here?
...
Using curl to upload POST data with files
...
@user956424 In the example, set "image" to the name of your field. And some languages, such as PHP, will build an array if you specify something like "image[]" for the inputs that need to be grouped together.
– jimp
...
Python: Why is functools.partial necessary?
...ents can be overridden right back (the "fixing" is rather, in a sense, the setting of defaults):
>>> f('23', base=10)
23
So, as you see, it's definely not as simplistic as lambda s: int(s, base=2)!-)
Yes, you could contort your lambda to give you some of this – e.g., for the keyword-o...
Get last n lines of a file, similar to tail
I'm writing a log file viewer for a web application and for that I want to paginate through the lines of the log file. The items in the file are line based with the newest item on the bottom.
...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...0.5 * (1 - x * y)
x' = x + x * r
y' = y + y * r
Or, even fancier, we can set h = 0.5 * y. This is the initialisation:
Y = approx_rsqrt(n)
x = Y * n
h = Y * 0.5
And this is the update step:
r = 0.5 - x * h
x' = x + x * r
h' = h + h * r
This is Goldschmidt's algorithm, and it has a huge advant...
How can I count the occurrences of a list item?
...
mylist = [1,7,7,7,3,9,9,9,7,9,10,0] print sorted(set([i for i in mylist if mylist.count(i)>2]))
– cpp-coder
Sep 9 '17 at 19:15
...
What is the difference between Θ(n) and O(n)?
...times I see Θ(n) with the strange Θ symbol with something in the middle of it, and sometimes just O(n). Is it just laziness of typing because nobody knows how to type this symbol, or does it mean something different?
...
Retaining file permissions with Git
...ersion Control System, created for software development, so from the whole set of modes and permissions it stores only executable bit (for ordinary files) and symlink bit. If you want to store full permissions, you need third party tool, like git-cache-meta (mentioned by VonC), or Metastore (used b...
What's the simplest way to test whether a number is a power of 2 in C++?
...
A power of two will have just one bit set (for unsigned numbers). Something like
bool powerOfTwo = !(x == 0) && !(x & (x - 1));
Will work fine; one less than a power of two is all 1s in the less significant bits, so must AND to 0 bitwise.
As I was...