大约有 40,000 项符合查询结果（耗时：0.0386秒） [XML]
Statistics: combinations in Python
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@robertking - Ok, you were both petty and technically correct. What i did was meant as illustration of how to write one's own function; i knew it is not accurate for big enough N and K due to floating point precision. But we can fix that - see above, now it should not err f...
Android Studio: how to attach Android SDK sources?
...er clicking on "show package details" you will see whether sources are installed or not (as shown in below picture) if it is not installed do install and you are good.
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What's the difference between “ ” and “ ”?
...ers are supposed to be self-contained. An outside link to codepen is also allowed, if the full answer is also included in the post directly. To adhere to SO policy, edit your post to either include the resulting output of the code in your answer, or to add SO's own embedded version of codepen, so ...
Can Go compiler be installed on Windows?
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There are now installers for Windows, see Go under Windows
HelloWorld.go
package main
func main() {
println("Hello World!");
}
Compile with 8g, link with 8l and then execute. Example:
8g HelloWorld.go
8l -o HelloWorld.exe HelloWorld....
How to group time by hour or by 10 minutes
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finally done with
GROUP BY
DATEPART(YEAR, DT.[Date]),
DATEPART(MONTH, DT.[Date]),
DATEPART(DAY, DT.[Date]),
DATEPART(HOUR, DT.[Date]),
(DATEPART(MINUTE, DT.[Date]) / 10)
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Best practices/performance: mixing StringBuilder.append with String.concat
...t can fit both s1 and s2. Copies s1 and s2 contents to this new array. Actually requires less work then + operator.
StringBuilder.append()
Maintains an internal char[] array that grows when needed. No extra char[] is created if the internal one is sufficiently big.
stringBuilder.append(s1.concat(...
How to establish a connection pool in JDBC?
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Usually if you need a connection pool you are writing an application that runs in some managed environment, that is you are running inside an application server. If this is the case be sure to check what connection pooling facil...
Iterating through a list in reverse order in java
...es the elegance of the for each syntax. +1 anyway.
– Allain Lalonde
Jan 20 '10 at 15:35
26
Callin...
How to convert linq results to HashSet or HashedSet
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I don't think there's anything built in which does this... but it's really easy to write an extension method:
public static class Extensions
{
public static HashSet<T> ToHashSet<T>(
this IEnumerable<T> source,
IEqualityComparer<T> comparer = null)
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Optimising Android application before release [closed]
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Thanks! I really like answers with resources. :-)
– Wroclai
Apr 11 '11 at 20:21
1
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