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Finding three elements in an array whose sum is closest to a given number
...A, but now you don't need the target value anymore.
Clearly, if we simply test all possible 3-tuples, we'd solve the problem in O(n3) -- that's the brute-force baseline. Is it possible to do better? What if we pick the tuples in a somewhat smarter way?
First, we invest some time to sort the array,...
Single script to run in both Windows batch and Linux Bash?
...he script from the default shell on either Windows or unix will work (only tested with bash). Because I cannot think of a way to include a shebang without making cmd complain loudly, you must always invoke the script via shell. I.e., be sure to use execlp() or execvp() (I think system() does this th...
Using AES encryption in C#
...st requires the following:
string encrypted = Cryptography.Encrypt(data, "testpass");
string decrypted = Cryptography.Decrypt(encrypted, "testpass");
By default, the implementation uses AesManaged - but you could actually also insert any other SymmetricAlgorithm. A list of the available Symmetric...
Is it good style to explicitly return in Ruby?
...did - and it failed. Fortunately at least it showed up in some functional tests.
– Tim Holt
Nov 30 '12 at 20:01
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Counting inversions in an array
...on in C++11, including a general iterator-based solution and sample random testbed using sequences from 5-25 elements. Enjoy!.
– WhozCraig
Apr 20 '14 at 20:15
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Best way to select random rows PostgreSQL
... 0.01;
EXPLAIN select * from table order by random() limit 1000;
A quick test on a large table1 shows, that the ORDER BY first sorts the complete table and then picks the first 1000 items. Sorting a large table not only reads that table but also involves reading and writing temporary files. The wh...
What is the most efficient way to deep clone an object in JavaScript?
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Checkout this benchmark: http://jsben.ch/#/bWfk9
In my previous tests where speed was a main concern I found
JSON.parse(JSON.stringify(obj))
to be the slowest way to deep clone an object (it is slower than jQuery.extend with deep flag set true by 10-20%).
jQuery.extend is pretty fast...
Entity Attribute Value Database vs. strict Relational Model Ecommerce
...NoSQL databases.
I've never practiced NoSQL in a production context (just tested MongoDB and was impressed) but the whole point of NoSQL is being able to save items with varying attributes in the same "document".
share
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Quickest way to convert a base 10 number to any base in .NET?
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I perf tested all of the solutions on this page, and this is the fastest, about twice as fast as the short solution at the end.
– Justin R.
Oct 3 '14 at 18:36
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What's the difference between HEAD, working tree and index, in Git?
...nt after each step, but save the commit until I've gotten back to working, tested code.
Notes:
the workspace is the directory tree of (source) files that you see and edit.
The index is a single, large, binary file in <baseOfRepo>/.git/index, which lists all files in the current branch...