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Generate all permutations of a list without adjacent equal elements
...ptotic running time is optimal, since the overhead of generation is on the order of the length of the output. The worst-case delay unfortunately is quadratic; it could be reduced to linear (optimal) with better data structures.
from collections import Counter
from itertools import permutations
from...
iPad/iPhone hover problem causes the user to double click a link
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Remove hover effects on mouseleave, touchmove and click.
Background
In order to simulate a mouse, browsers such as Webkit mobile fire the following events if a user touches and releases a finger on touch screen (like iPad) (source: Touch And Mouse on html5rocks.com):
touchstart
touchmove
touch...
How to do ssh with a timeout in a script?
...h some sort of configuration management tool like puppet/ansible/chef/salt/etc.
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Why is the default value of the string type null instead of an empty string?
...r null before I can safely apply methods like ToUpper() , StartWith() etc...
14 Answers
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How to efficiently concatenate strings in go
...xample: For the peeking behavior when the bytes are passed to an io.Reader etc.
Note
Do not copy a StringBuilder value as it caches the underlying data.
If you want to share a StringBuilder value, use a pointer to it.
Check out its source code for more details, here.
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How to add onload event to a div element
...d of the html document just before the </body> tag? If yes, does the order in which they're written matter?
– Neo
Oct 10 '17 at 9:34
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Virtual Serial Port for Linux
...0 to /dev/tnt7 where tnt0 is connected to tnt1, tnt2 is connected to tnt3, etc.
You may need to fix the file permissions to be able to use the devices.
edit:
I guess I was a little quick with my enthusiasm. While the driver looks promising, it seems unstable. I don't know for sure but I think it ...
What is InputStream & Output Stream? Why and when do we use them?
...ngs (like the screen, or Files, or byte arrays, or network connections, or etc). InputStream classes access the same things, but they read data in from them.
Here is a good basic example of using FileOutputStream and FileInputStream to write data to a file, then read it back in.
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How to Deal with Temporary NSManagedObject instances?
...riginalContext persistentStore]];
Then you add new objects, mutate them, etc.
When it comes time to save, you need to call [tempContext save:...] on the tempContext, and handle the save notification to merge that into your original context. To discard the objects, just release this temporary cont...
Database cluster and load balancing
...ntended to guarantee validity even in the event of errors, power failures, etc. In the context of databases, a sequence of database operations that satisfies the ACID properties (and these can be perceived as a single logical operation on the data) is called a transaction. For example, a transfer of...