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std::next_permutation Implementation Explanation
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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What is cURL in PHP?
... FTP uploading (this can also be done with PHP's ftp extension), HTTP form based upload, proxies, cookies, and user+password authentication.
PHP/cURL: The module for PHP that makes it possible for PHP programs to use libcurl.
How to use it:
step1: Initialize a curl session use curl_init().
step2...
Convert hex string to int in Python
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Without the 0x prefix, you need to specify the base explicitly, otherwise there's no way to tell:
x = int("deadbeef", 16)
With the 0x prefix, Python can distinguish hex and decimal automatically.
>>> print int("0xdeadbeef", 0)
3735928559
>>> print in...
Two-way encryption: I need to store passwords that can be retrieved
...json).
After you have successfully encrypted using mcrypt, run it through base64_encode and then convert it to hex code. Once in hex code it's easy to transfer in a variety of ways.
$td = mcrypt_module_open('tripledes', '', 'ecb', '');
$iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RA...
libunwind链接时报错：undefined reference to `_Ux86_64_init_local\' - ...
libunwind链接时报错：undefined reference to `_Ux86_64_init_local'编译安装libunwind后，代码编译链接时报错：undefined reference to `_Ux86_64_init_local& 39;，链接选项加了 -lunwind，仍然报错。原因：编译出来的libunwind拆分成了很多个 编译安装libunwi...
Maximum number of records in a MySQL database table
What is the upper limit of records for MySQL database table. I'm wondering about autoincrement field. What would happen if I add milions of records? How to handle this kind of situations?
Thx!
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Failed to install Python Cryptography package with PIP and setup.py
... ships manylinux wheels. This means users with pip 8.1+ running on a glibc-based distribution (almost everything except Alpine Linux) and on x86/x86-64 no longer need a compiler or headers because you'll get a precompiled wheel automatically. With version 3.1 we now also ship aarch64 wheels (which r...
Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?
...ain, but can be avoided by using dependency breaking idioms. In processors based on Intel Core micro-architecture, a number of instructions can help clear execution dependency when software uses these instruction to clear register content to zero. Break dependencies on portions of registers between ...
Python, remove all non-alphabet chars from string
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Regex to match string containing two names in any order
...atements:
(?!.*\bjack\b.*\bjack\b)
and,
(?!.*\bjames\b.*\bjames\b)
RegEx Demo 1
We can also simplify that to:
^(?!.*\bjack\b.*\bjack\b|.*\bjames\b.*\bjames\b)(?=.*\bjames\b|.*\bjack\b).*$
RegEx Demo 2
If you wish to simplify/update/explore the expression, it's been explained on the top right pan...