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Best way to find the intersection of multiple sets?
...of "take the sum of all these", "take the product of all these", "take the xor of all these", what you are looking for is the reduce function:
from operator import and_
from functools import reduce
print(reduce(and_, [{1,2,3},{2,3,4},{3,4,5}])) # = {3}
or
print(reduce((lambda x,y: x&y), [{1,...
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@胡晓奇:感谢克强总理!昂贵的通讯费,终于开始降价了。
@tigerhua_bike:...
How to choose an AES encryption mode (CBC ECB CTR OCB CFB)?
...milarly to stream ciphers generally, the generated pseudo random stream is XORed with the plaintext to generate the ciphertext. As you can use as many bits of the random stream as you like you don't need padding at all. Disadvantage of this simplicity is that the encryption is completely malleable, ...
新浪微博 阿里巴巴囊中物？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...公司18%的股份，成为新浪的第二大股东。目前，阿里持有从新浪剥离出来的微博公司32%股权。
在分析人士看来，从对优酷土豆的资本运作来看，阿里采取了先入股后全资收购的做法，从这点来看，它也同样可能对新浪微博采取...
mongodb, replicates and error: { “$err” : “not master and slaveOk=f...
...r and slaveOk=false”, “code” : 13435出现这个错误的原因是在从库上执行命令导致，默认情况下只有主库可以执行命令。当然可以通过设置使得从库也能执行命令，具体参见：http: s 出现这个错误的原因是在从库上执行命令导致，...
The tilde operator in Python
...wos-complement representation of the integer are reversed (as in b <- b XOR 1 for each individual bit), and the result interpreted again as a twos-complement integer. So for integers, ~x is equivalent to (-x) - 1.
The reified form of the ~ operator is provided as operator.invert. To support th...
提升大数据分析思想，拥抱大数据未来 - 资讯 - 清泛网 - 专注C/C++及内核技术
...域而使得其价值超越了作为原始产品本身。
以IBM近期对从美国本田汽车公司和太平洋电力公司收集而来的数据的应用为例，最初，太平洋煤气电力公司收集数据是为了管理其服务的稳定性，而本田收集电动汽车的数据是为了提...
PHP常用API函数用法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...处开始。
正数 - 在字符串的指定位置开始
负数 - 在从字符串结尾开始的指定位置开始
0 - 在字符串中的第一个字符处开始
length
可选。规定被返回字符串的长度。默认是直到字符串的结尾。
正数 - 从 star...
Why is address zero used for the null pointer?
... costly than now. The number zero can be conveniently calculated using an XOR instruction or without the need to load an immediate value. Depending upon the architecture, this could potentially save space.
– Sparky
May 3 '10 at 17:46
...
How to add a 'or' condition in #ifdef
...f
Further-
AND: #if defined CONDITION1 && defined CONDITION2
XOR: #if defined CONDITION1 ^ defined CONDITION2
AND NOT: #if defined CONDITION1 && !defined CONDITION2
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