大约有 47,000 项符合查询结果（耗时：0.0278秒） [XML]
Obtaining a powerset of a set in Java
...2^n possible combinations. Here's a working implementation, using generics and sets:
public static <T> Set<Set<T>> powerSet(Set<T> originalSet) {
Set<Set<T>> sets = new HashSet<Set<T>>();
if (originalSet.isEmpty()) {
sets.add(new HashS...
Swift Beta performance: sorting arrays
I was implementing an algorithm in Swift Beta and noticed that the performance was very poor. After digging deeper I realized that one of the bottlenecks was something as simple as sorting arrays. The relevant part is here:
...
How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?
...ow about accesing data from one structure vs the other? I'm thinking cache and location
– Horia Toma
Apr 14 '14 at 22:38
9
...
Get index of array element faster than O(n)
Given I have a HUGE array, and a value from it. I want to get index of the value in array. Is there any other way, rather then call Array#index to get it? The problem comes from the need of keeping really huge array and calling Array#index enormous amount of times.
...
python location on mac osx
...if the previous owner of the laptop has installed macpython using macport. And I remembered that osx has an builtin version of python. I tried using type -a python and the result returned
...
Comparing two dictionaries and checking how many (key, value) pairs are equal
...
Maybe something like this:
shared_items = {k: x[k] for k in x if k in y and x[k] == y[k]}
print len(shared_items)
share
|
improve this answer
|
follow
|
...
Best way to represent a fraction in Java?
...too long ago, for Project Euler problems. It keeps a BigInteger numerator and denominator, so it'll never overflow. But it'll be a tad slow for a lot of operations that you know will never overflow.. anyway, use it if you want it. I've been dying to show this off somehow. :)
Edit: Latest and gre...
Installing R on Mac - Warning messages: Setting LC_CTYPE failed, using “C”
...e runs R in a docker environment (under root), try to run R with below command,
LC_ALL=C.UTF-8 R
# instead of just `R`
share
|
improve this answer
|
follow
|
...
I keep getting “Uncaught SyntaxError: Unexpected token o”
... that's interesting.. I guess jquery takes a guess at datatype and assumes it's json. I would think that getJson would work then as well, right?
– ek_ny
Nov 10 '11 at 15:54
...
What is the Python equivalent of Matlab's tic and toc functions?
What is the Python equivalent of Matlab's tic and toc functions ?
12 Answers
12
...