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Is there a math nCr function in python? [duplicate]
... calculates nCr in an efficient manner (compared to calculating factorials etc.)
import operator as op
from functools import reduce
def ncr(n, r):
r = min(r, n-r)
numer = reduce(op.mul, range(n, n-r, -1), 1)
denom = reduce(op.mul, range(1, r+1), 1)
return numer // denom # or / in ...
What are good uses for Python3's “Function Annotations”
...estrictions, threads that are allowed to access, architecture limitations, etc., and there are quite a few tools that can then read these and process them to provide assurances beyond what you get from the compilers. You could even write things that check preconditions/postconditions.
I feel somet...
How to reset postgres' primary key sequence when it falls out of sync?
...r due to unplanned database shutdowns, transaction rollbacks after errors, etc.
– Craig Ringer
Sep 20 '17 at 2:04
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show 12 more comments
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Express-js can't GET my static files, why?
...he "public" directory in the application directory.
// GET /style.css etc
app.use(express.static(__dirname + '/public'));
// Mount the middleware at "/static" to serve static content only when their request path is prefixed with "/static".
// GET /static/style.css etc.
app.use('/s...
如何设置squid使外网也可以通过代理服务器上网，并且使用代理服务器的ip地...
...
dns_nameservers ********
cache_effective_user squid squid
http_access allow all
原来加上一条
http_reply_access allow all
就可以了。squid 代理服务器
How to loop through all the properties of a class?
...ic instance properties (excluding static properties, protected properties, etc).
You don't need to specify BindingFlags.GetProperty, you use that when calling type.InvokeMember() to get the value of a property.
share
...
c++文件流基本用法(ifstream, ostream,fstream) - C/C++ - 清泛网 - 专注C/C++及内核技术
...write函数来读写文件。可参见：
https://www.tsingfun.com/it/cpp/all_programming_language_file_read_write_summary.html#C
c++ ,文件流,ifstream, ostream,fstream
win10启动过程中黑屏时间长的解决办法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
3.重启电脑。
“EnableUlps” parameter is now set to zero for all AMD cards.
Disabling this parameter should fix Delayed Startup/BSODS on many laptops.
原来整合包就是通过关闭ulps解决开机延迟的问题。ULPS全称Ultra Low Power State，ULPS是休眠状态 ，降低非...
Can you add new statements to Python's syntax?
...zer module. This should allow you to add new keywords, control structures etc while interpreting the source similarly to the python interpreter, thus avoiding the breakage crude regex solutions would cause. For the above "myprint", you could write the following transformation code:
import tokeniz...
Splitting templated C++ classes into .hpp/.cpp files--is it possible?
...'s going on, remove confusion around makefiles targeting actual cpp files, etc.
– underscore_d
Jan 15 '16 at 11:55
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