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Is there a math nCr function in python? [duplicate]
...port 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 Python 2
As of Python 3.8, binomial coefficients are available in the standard library as math.comb:
>>> fr...
Calling filter returns [duplicate]
...urned by the filter function.
If you want a list, just do
list(filter(f, range(2, 25)))
Nonetheless, you can just iterate over this object with a for loop.
for e in filter(f, range(2, 25)):
do_stuff(e)
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How to get a list of all valid IP addresses in a local network? [closed]
...r more commonly
nmap -sn 192.168.1.0/24
will scan the entire .1 to .254 range
This does a simple ping scan in the entire subnet to see which hosts are online.
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std::find，std::find_if使用小结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...rst
An input iterator addressing the position of the first element in the range
to be searched.
_Last
An input iterator addressing the position one past the final element in the
range to be searched.
_Pred
User-defined predicate function object that defines the condition to be
satisfied by t...
ORACLE 启动提示 内存不足 OUTOF MEMORY - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...ernel.sem = 250 32000 100 128
fs.file-max = 65536
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default=262144
net.core.rmem_max=262144
net.core.wmem_default=262144
net.core.wmem_max=262144
在ORACEL 用户下
输入 su - root
敲入密码
输入 gedit /etc/sysctl.conf...
VBA 获取某列最后一行非空行号 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...total_row As Integer & 39;非空行号tab_total = Worksheets("总表") Range("a65536") End(xlUp) Row（完）VBA 获取某列最后一行非空行号代码：
Dim tab_total_row As Integer
'非空行号
tab_total = Worksheets("总表").Range("a65536").End(xlUp).Row
（完）VBA
VBA读写UTF8文本文件，VBA生成UTF-8无BOM格式的文件 - 更多技术 - 清泛网 -...
...cr + "mydata = {" + vbCrLf
scr = scr & " cljsl:" & Round(sht.Range("N11").Value * 100, 2) & "," + vbCrLf
scr = scr & " myl:" & Round(sht.Range("W11").Value * 100, 2) & "," + vbCrLf
'小组
For i = 1 To 8
arr_acsp_xz(i) = "'" & sht.Cells(i + 2, 1) & "'"
...
Rails 3 - can't install pg gem
..., download typing this in your terminal:
ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
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Placing Unicode character in CSS content value [duplicate]
...es contain a character with Unicode codepoint zero.) If a character in the range [0-9a-fA-F] follows the hexadecimal number, the end of the number needs to be made clear. There are two ways to do that:
with a space (or other white space character): "\26 B" ("&B"). In this case, user agen...
How to avoid mysql 'Deadlock found when trying to get lock; try restarting transaction'
...ing it up like this is less efficient but it avoids the need to hold a key-range lock during the delete.
Also, modify your select queries to add a where clause excluding rows older than 900 seconds. This avoids the dependency on the cron job and allows you to reschedule it to run less often.
Th...