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What guarantees are there on the run-time complexity (Big-O) of LINQ methods?
...ementation, so that this operation is O(1) instead of O(N).
Distinct, GroupBy Join, and I believe also the set-aggregation methods (Union, Intersect and Except) use hashing, so they should be close to O(N) instead of O(N²).
Contains checks for an ICollection implementation, so it may be O(1) if the...
Why '&&' and not '&'?
...
A similar but simpler example of this is the following code (as mentioned by TJHeuvel):
if(op != null && op.CanExecute())
{
// Do Something
}
CanExecute is only executed if op is not null. If op is null, the first part of the expression (op != null) evaluates to false and the evaluat...
Object reference not set to an instance of an object.Why doesn't .NET show which object is `null`?
...ined. If it is predefined then it can be null(like string which occupies 2 Bytes) but if it is user-defined than we have to create an instance of it so that it knows that this object will occupy this much memory. So therefore it throws error at run-time.
...
Browsers' default CSS for HTML elements
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...
mysql> GRANT all privileges on extmail.* TO extmail@localhost IDENTIFIED BY 'extmail';
Query OK, 0 rows affected (0.00 sec)
mysql> GRANT all privileges on extmail.* TO extmail@127.0.0.1 IDENTIFIED BY 'extmail';
Query OK, 0 rows affected (0.00 sec)
3、安装配置apache
yum install httpd ...
How to check whether a pandas DataFrame is empty?
... imageUploader: {
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How to make Twitter Bootstrap menu dropdown on hover rather than click
...ll get swept into the little button at top right, which is still triggered by a click. Big Thanks!
– ptim
Jan 28 '13 at 6:23
11
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Same-named attributes in attrs.xml for custom view
...elationship, which can only be deduced in the associated style definitions by naming conventions and the specific items defined therein (noticing that a few belong to one styleable and a few to another). I'd rather make it explicit with the parent attribute but haven't seen many posts suggesting it'...
How fast is D compared to C++?
...kend. Benchmarks that do heavily stress the GC will show that D performs abysmally. Rest assured, though, this is a single (albeit severe) quality-of-implementation issue, not a baked-in guarantee of slowness. Also, D gives you the ability to opt out of GC and tune memory management in performanc...
Does MSTest have an equivalent to NUnit's TestCase?
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...