大约有 30,000 项符合查询结果（耗时：0.0323秒） [XML]
What are the options for storing hierarchical data in a relational database? [closed]
...,000 Nodes = 00:00:00:870
Duration for 10,000 Nodes = 00:01:01:783 (70 times slower instead of just 10)
Duration for 100,000 Nodes = 00:49:59:730 (3,446 times slower instead of just 100)
Duration for 1,000,000 Nodes = 'Didn't even try this'
And here's the duration for the new method (with t...
Java enum - why use toString instead of name
...t obvious to me until I read your comments.
– martinatime
May 5 '14 at 15:57
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Where to place private methods in Ruby?
... once, before the ymethod, also works. There is no need to add it multiple times.
– Iulian Onofrei
Mar 13 '18 at 20:09
...
Undefined symbols for architecture arm64
I am getting a Apple Mach-O Linker Error everytime I import a file from CocoaPods.
41 Answers
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Purpose of memory alignment
... that the 2 LSBs are always 0 (e.g., 32-bit machines) then it can access 4 times more memory (the 2 saved bits can represent 4 distinct states), or the same amount of memory with 2 bits for something like flags. Taking the 2 LSBs off of an address would give you a 4-byte alignment; also referred to ...
Can we instantiate an abstract class?
...us direct subclass of the class named by T is declared. It is a compile-time error if the
class denoted by T is a final class.
If T denotes an interface, then an anonymous direct subclass of Object that implements the interface named by T is declared.
In either case, the body of the s...
How to subtract a day from a date?
I have a Python datetime.datetime object. What is the best way to subtract one day?
6 Answers
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How to get past the login page with Wget?
...
If you need it for one time use, you can log in via browser and copy needed headers afterwards:
Use "Copy as cURL" in the Network tab of Developer Tools (reload the page after opening) and replace curl's header flag -H and --data with wget's --he...
Can I use jQuery with Node.js?
... $.on('ready', function () {
// do some stuff to the dom in real-time
$('body').append('Hello World');
$('body').append('<input type="text" />');
$('input').live('click', function () {
console.log('input clicked');
// ...
});
...
For each row return the column name of the largest value
...ast"]), rowid, mult="first"]
Benchmarking:
# data.table solution
system.time({
DT <- data.table(value=unlist(DF, use.names=FALSE),
colid = 1:nrow(DF), rowid = rep(names(DF), each=nrow(DF)))
setkey(DT, colid, value)
t1 <- DT[J(unique(colid), DT[J(unique(colid)), value, mult="las...