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Advantages of Binary Search Trees over Hash Tables
...y Search Trees (reference-based) are memory-efficient. They do not reserve more memory than they need to.
For instance, if a hash function has a range R(h) = 0...100, then you need to allocate an array of 100 (pointers-to) elements, even if you are just hashing 20 elements. If you were to use a bin...
PostgreSQL DISTINCT ON with different ORDER BY
...ND t1.purchased_at = t2.max_purchased_at
ORDER BY t1.purchased_at DESC
A more PostgreSQL-oriented solution based on @hkf's answer:
SELECT * FROM (
SELECT DISTINCT ON (address_id) *
FROM purchases
WHERE product_id = 1
ORDER BY address_id, purchased_at DESC
) t
ORDER BY purchased_at DESC
...
Best way to allow plugins for a PHP application
...tter alternatives, I suggest you check out the WordPress Documentation for more information.
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What is the difference between graph search and tree search?
...rom open
}
return next
Comparison
We notice that graph search requires more memory, as it keeps track of all visited states. This may compensated by the smaller open list, which results in improved search efficiency.
Optimal solutions
Some methods of implementing select can guarantee to return...
What are the risks of running 'sudo pip'?
...es somewhere else (e.g. in an virtualenv). Doing so may even be better and more reliable even when ignoring all security concerns.
– user395760
Jan 10 '14 at 23:48
2
...
@selector() in Swift?
...ath(#keyPath(Person.friends.firstName)). See SE-0062 for details. And even more KeyPath stuff in Swift 4, so make sure you're using the right KeyPath-based API instead of selectors if appropriate.
You can read more about selectors under Interacting with Objective-C APIs in Using Swift with Cocoa and...
CSS force image resize and keep aspect ratio
...
Seems that display: block is no more needed.
– actimel
Jun 26 '14 at 9:18
3
...
Python - Get path of root project structure
..., but that isn't strictly true (it's a convention after all). See this for more: stackoverflow.com/questions/2361124/using-init-py
– jrd1
Jan 5 '17 at 5:58
1
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Batch files - number of command line arguments
...HAVE_0
IF "%2"=="" GOTO HAVE_1
IF "%3"=="" GOTO HAVE_2
etc.
If you have more than 9 arguments then you are screwed with this approach though. There are various hacks for creating counters which you can find here, but be warned these are not for the faint hearted.
...