大约有 13,916 项符合查询结果（耗时：0.0356秒） [XML]
What is dynamic programming? [closed]
...n you use past knowledge to make solving a future problem easier.
A good example is solving the Fibonacci sequence for n=1,000,002.
This will be a very long process, but what if I give you the results for n=1,000,000 and n=1,000,001? Suddenly the problem just became more manageable.
Dynamic progr...
kernel stack and user space stack
...ter register), and usually different memory access protections. I.e. when executing in user mode, kernel memory (part of which is the kernel stack) will not be accessible even if mapped. Vice versa, without explicitly being requested by the kernel code (in Linux, through functions like copy_from_use...
What does template mean?
...ipulate it in a way we might with any other integer literal:
unsigned int x = N;
In fact, we can create algorithms which evaluate at compile time (from Wikipedia):
template <int N>
struct Factorial
{
enum { value = N * Factorial<N - 1>::value };
};
template <>
struct Fac...
deciding among subprocess, multiprocessing, and thread in Python?
...nt and write their output to separate files. I don't need the threads to exchange information but it is imperative that I know when the threads finish since some steps of my pipeline depend on their output.
...
Why can't we have static method in a (non-static) inner class?
...
Exactly. I want to write a utility inner class. Some of its methods would benefit from access to the outer class, so I can't make it static, but some of its methods are just utility functions. Why can't I call A.B.sync(X) or e...
How to solve error “Missing `secret_key_base` for 'production' environment” (Rails 4.1)
... to manage the secret_key, so if you read the secrets.yml file located at exampleRailsProject/config/secrets.yml you'll find something like this:
# Do not keep production secrets in the repository,
# instead read values from the environment.
production:
secret_key_base: <%= ENV["SECRET_KEY_BAS...
Why should C++ programmers minimize use of 'new'?
.... It is very, very fast because it requires minimal bookkeeping and the next address to allocate is implicit.
In C++, this is called automatic storage because the storage is claimed automatically at the end of scope. As soon as execution of current code block (delimited using {}) is completed, mem...
How does one write code that best utilizes the CPU cache to improve performance?
...that the hot loops use hot data.
avoid algorithms and datastructures that exhibit irregular access patterns, and favor linear datastructures.
We should also note that there are other ways to hide memory latency than using caches.
Modern CPU:s often have one or more hardware prefetchers. They trai...
iOS 7 status bar back to iOS 6 default style in iPhone app?
...or. When the API refers to UIStatusBarStyleLightContent, they mean white text on a clear background. UIStatusBarStyleDefault is black text on a clear background.
Status bar appearance is controlled along one of two mutually-exclusive basis paths: you can either set them programmatically in the tradi...