大约有 31,840 项符合查询结果（耗时：0.0252秒） [XML]
Constant Amortized Time
... There is a constant c, such that for
every sequence of operations (also one ending with a costly operation) of
length L, the time is not greater than
c*L (Thanks Rafał Dowgird)
share
|
impr...
How to find and return a duplicate value in array
...}
I know this isn't very elegant answer, but I love it. It's beautiful one liner code. And works perfectly fine unless you need to process huge data set.
Looking for faster solution? Here you go!
def find_one_using_hash_map(array)
map = {}
dup = nil
array.each do |v|
map[v] = (map[v...
Bitwise operation and usage
...se operators are operators that work on multi-bit values, but conceptually one bit at a time.
AND is 1 only if both of its inputs are 1, otherwise it's 0.
OR is 1 if one or both of its inputs are 1, otherwise it's 0.
XOR is 1 only if exactly one of its inputs are 1, otherwise it's 0.
NOT is 1 only...
Difference between using bean id and name in Spring configuration file
...
From the Spring reference, 3.2.3.1 Naming Beans:
Every bean has one or more ids (also
called identifiers, or names; these
terms refer to the same thing). These
ids must be unique within the
container the bean is hosted in. A
bean will almost always have only one
id, but if a b...
Which would be better for concurrent tasks on node.js? Fibers? Web-workers? or Threads?
...lve the problem: Fibers, Webworkers and Threads (thread-a-gogo). Now which one to use is a confusion and one of them definitely needs to be used - afterall what's the purpose of having a server which is just good at IO and nothing else? Suggestions needed!
...
Compile time string hashing
...might be possible to compute a string's hash at compile time. However, no one seems to be ready to come out and say that it will be possible or how it would be done.
...
How to replace strings containing slashes with sed?
... to use a different delimiter in your search/replace lines, e.g.:
s:?page=one&:pageone:g
You can use any character as a delimiter that's not part of either string. Or, you could escape it with a backslash:
s/\//foo/
Which would replace / with foo. You'd want to use the escaped backslash in...
What is the use of a private static variable in Java?
...
static is class level variable, which is common and only one copy exists for all instances of that class. The rule is applicable whether it is private or public. private just says I don't want out side world to corrupt my variable value (for non-final statics) . If a static is fina...
Multithreading: What is the point of more threads than cores?
...separate lines of execution at once. In an 'ideal' system, you would have one thread executing per core: no interruption. In reality this isn't the case. Even if you have four cores and four working threads, your process and it threads will constantly be being switched out for other processes and...
What is the difference between JOIN and UNION?
...
Joins and Unions can be used to combine data from one or more tables. The difference lies in how the data is combined.
In simple terms, joins combine data into new columns. If two tables are joined together, then the data from the first table is shown in one set of column...