大约有 3,285 项符合查询结果（耗时：0.0276秒） [XML]
Removing duplicates from a list of lists
...ols.groupby(k))
[[1, 2], [3], [4], [5, 6, 2]]
itertools often offers the fastest and most powerful solutions to this kind of problems, and is well worth getting intimately familiar with!-)
Edit: as I mention in a comment, normal optimization efforts are focused on large inputs (the big-O approach...
How can I generate random alphanumeric strings?
...emory available). Having said that, Dan Rigby's answer was almost twice as fast as this one in every test.
– LukeH
Aug 28 '09 at 0:33
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When should an IllegalArgumentException be thrown?
...a non recoverable error).
In this case and following the approach of fail fast you should let the application finish to avoid corrupting the application state.
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How to hash a password
...tly degrades passwords with unusual characters 2) Plain MD5/SHA-1/SHA-2 is fast. 3) You need a salt. | Use PBKDF2, bcrypt or scrypt instead. PBKDF2 is easiest in the Rfc2898DeriveBytes class (not sure if present on WP7)
– CodesInChaos
May 11 '12 at 21:21
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Git merge master into feature branch
...:
git checkout feature1
git merge master
There is no point in forcing a fast forward merge here, as it cannot be done. You committed both into the feature branch and the master branch. Fast forward is impossible now.
Have a look at GitFlow. It is a branching model for git that can be followed, a...
Does anyone have benchmarks (code & results) comparing performance of Android apps written in Xamari
...s that their Mono implementation on Android and their C# compiled apps are faster than Java code. Did anyone perform actual benchmarks on very similar Java and C# code on different Android platforms to verify such claims, could post the code and results?
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How to find duplicates in 2 columns not 1
...SQL > 5.5 and on InnoDB table, and in Percona because of
their InnoDB fast index creation feature [http://bugs.mysql.com/bug.php?id=40344]. In this case
first run set session old_alter_table=1 and then the above command
will work fine
Update - ALTER IGNORE Removed In 5.7
From the docs
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Calculate a Running Total in SQL Server
...t is telling me that this is one of those rare cases where a cursor is the fastest, though I will have to do some benchmarking on big results.
The update trick is handy but I feel its fairly fragile. It seems that if you are updating a full table then it will proceed in the order of the primary key...
Parse large JSON file in Nodejs
... time, this will be extremely memory efficient. It will also be extremely fast. A quick test showed I processed 10,000 rows in under 15ms.
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Can unit testing be successfully added into an existing production project? If so, how and is it wor
...h of your production code base is under test.
Build time should always be FAST. If your build time is slow, your unit testing skills are lagging. Find the slow tests and improve them (decouple production code and test in isolation). Well written, you should easilly be able to have several thousands...