大约有 40,000 项符合查询结果（耗时：0.0460秒） [XML]
What are the differences between Perl, Python, AWK and sed? [closed]
...ange from a?ⁿaⁿ to a??ⁿaⁿ then run that in Perl 5 with an ⁿ of 1,000,000 it runs in less than two seconds. time perl -E '$x=1_000_000;$_="a"x$x;$m=("a??"x$x).("a"x$x);say $_=~$m' If you run the naive one it takes more than two seconds for an ⁿ of just 25. The thing you have to realize is...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...rse & 0xFF00) >> 8;
unsigned char inByte2 = (toReverse & 0xFF0000) >> 16;
unsigned char inByte3 = (toReverse & 0xFF000000) >> 24;
reversed = (reverseBits(inByte0) << 24) | (reverseBits(inByte1) << 16) | (reverseBits(inByte2) << 8) | (reverseBits(inByte...
Why are static variables considered evil?
... your class, and then asked your class to execute a particular function 10,000 times, once those 10,000 calls were done, and you delete your references to the single instance, all your static variables could be garbage collected and reused.
Prevents certain re-use:
Also, static methods cannot be u...
Swapping two variable value without using third variable
... share an address. x != y
*x = *x xor *y //*x = 0011 xor 0011
//So *x is 0000
*y = *x xor *y //*y = 0000 xor 0011
//So *y is 0011
*x = *x xor *y //*x = 0000 xor 0011
//So *x is 0011
Should this be used?
In general cases, no. The compiler will optimize away the temporary variable and give...
Length of an integer in Python
... is already behind for even quite small numbers
timeit math.log10(2**8)
1000000 loops, best of 3: 746 ns per loop
timeit len(str(2**8))
1000000 loops, best of 3: 1.1 µs per loop
timeit math.log10(2**100)
1000000 loops, best of 3: 775 ns per loop
timeit len(str(2**100))
100000 loops, best of 3: ...
How to change the color of an svg element?
....dtd">
<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
width="500px" height="500px" viewBox="0 0 500 500" enable-background="new 0 0 500 500" xml:space="preserve">
<g>
<path d="M1...
Make Iframe to fit 100% of container's remaining height
...00;
height: 30px;
}
iframe {
display: block;
background: #000;
border: none;
height: calc(100vh - 30px);
width: 100%;
}
<div class="banner"></div>
<iframe></iframe>
Support for calc() here; support for viewport relative units here.
...
Plurality in user messages
... Probably apocryphal, but many years back I read that Lotus had shipped 40,000 units of Lotus Notes for the Mac and 60,000 were returned. The interface was so bad that even the people who had pirated it sent it back.
– Duncan
Nov 24 '10 at 2:38
...
Why aren't ◎ܫ◎ and ☺ valid JavaScript variable names?
... a single ASCII-only regular expression for JavaScript, it would be over 9,000 characters long. Here it is:
// ECMAScript 5.1 / Unicode v6.3.0:
/^(?!(?:do|if|in|for|let|new|try|var|case|else|enum|eval|null|this|true|void|with|break|catch|class|const|false|super|throw|while|yield|delete|export|impor...
Can't connect to local MySQL server through socket '/var/mysql/mysql.sock' (38)
...
I got the following error
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)
Tried several ways and finally solved it through the following way
sudo gksu gedit /etc/mysql/my.cnf
modified
#bind-address ...