大约有 20,000 项符合查询结果（耗时：0.0354秒） [XML]
Given a number, find the next higher number which has the exact same set of digits as the original n
...ediately left of digit-x. Finally, sort the remaining digits in ascending order - since they were already in descending order, all you need to do is reverse them (save for digit-x, which can be placed in the correct place in O(n)).
An example will make this more clear:
123456784987654321
start w...
How to sort a HashSet?
...
A HashSet does not guarantee any order of its elements. If you need this guarantee, consider using a TreeSet to hold your elements.
However if you just need your elements sorted for this one occurrence, then just temporarily create a List and sort that:
Se...
Efficiently test if a port is open on Linux?
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In order to check for port 80 I needed to use awk '$6 == "LISTEN" && $4 ~ "80$"'. Instead of checking for the dot before the port number with \.80, I used 80$. Otherwise, this also matched IP addresses containing .80 and...
Detect permission of camera in iOS
...default:
completion?(.unknown)
}
}
}
And then in order to use it you do
AVCaptureDevice.authorizeVideo(completion: { (status) in
//Your work here
})
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How to concatenate strings of a string field in a PostgreSQL 'group by' query?
...e
GROUP BY company_id;
Postgres 9.0 also added the ability to specify an ORDER BY clause in any aggregate expression; otherwise, the order is undefined. So you can now write:
SELECT company_id, string_agg(employee, ', ' ORDER BY employee)
FROM mytable
GROUP BY company_id;
Or indeed:
SELECT str...
Why does this Java program terminate despite that apparently it shouldn't (and didn't)?
...ur object is not safely published those 4 write operations can be freely reordered by the compiler / JVM.
So from the perspective of the reading thread, it is a legal execution to read x with its new value but y with its default value of 0 for example. By the time you reach the println statement (w...
In Vim, how do I apply a macro to a set of lines?
...ual selection or by a :40,50 / :+10
See http://www.vim.org/scripts/script.php?script_id=3271
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ssh: connect to host github.com port 22: Connection timed out
...
I had to remove the .git from the url in order for this to work for me. url = github.com/username/repo
– Jesse Buss
Dec 21 '17 at 15:38
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RSpec: describe, context, feature, scenario?
...ike this:
#
# The feature/behaviour I'm currently testing
#
describe "item ordering" do
# 1st state of the feature/behaviour I'm testing
context "without a order param" do
...
end
# 2nd state of the feature/behaviour I'm testing
context "with a given order column" do
..
end
...
Best way of invoking getter by reflection
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Is there a way to invoke the methods in the order in which the fields are listed in the Java file?
– LifeAndHope
Jun 21 '15 at 19:37
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