大约有 44,500 项符合查询结果（耗时：0.0410秒） [XML]
Key existence check in HashMap
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Do you ever store a null value? If not, you can just do:
Foo value = map.get(key);
if (value !...
How do I determine k when using k-means clustering?
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142
You can maximize the Bayesian Information Criterion (BIC):
BIC(C | X) = L(X | C) - (p / 2) * lo...
How to insert an item at the beginning of an array in PHP?
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284
Use array_unshift($array, $item);
$arr = array('item2', 'item3', 'item4');
array_unshift($arr...
Compile time string hashing
...s is a little bit late, but I succeeded in implementing a compile-time CRC32 function with the use of constexpr. The problem with it is that at the time of writing, it only works with GCC and not MSVC nor Intel compiler.
Here is the code snippet:
// CRC32 Table (zlib polynomial)
static constexpr u...
How to execute a Ruby script in Terminal?
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Just call: ruby your_program.rb
or
start your program with #!/usr/bin/env ruby,
make your f...
How to use JavaScript variables in jQuery selectors?
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var name = this.name;
$("input[name=" + name + "]").hide();
OR you can do something like thi...
How to check if a number is a power of 2
Today I needed a simple algorithm for checking if a number is a power of 2.
25 Answers
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What is the most efficient way to concatenate N arrays?
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Does Swift have documentation generation support?
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12 Answers
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Update Eclipse with Android development tools v. 23
I updated Eclipse with the new SDK tools (rev. 23), but now when Eclipse starts I receive the error:
43 Answers
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