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Ukkonen's suffix tree algorithm in plain English
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The following is an attempt to describe the Ukkonen algorithm by first showing what it does when the string is simple (i.e. does not contain any repeated characters), and then extending it to the full algorithm.
First, a few preliminary statements.
What we are building...
Elegant way to invert a map in Scala
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You can avoid the ._1 stuff while iterating in few ways.
Here's one way. This uses a partial function that covers the one and only case that matters for the map:
Map() ++ (origMap map {case (k,v) => (v,k)})
Here's another way:
import Function.tupled
Map() ++ (origMap map ...
One SVN repository or many?
...sitories are may require multiple files. Maintenance has similar issues - one big backup, or a lot of little backups.
I manage my own. There's one repository, multiple projects, each with its own tags, trunk and branches. If one gets too big or I need to physically isolate a customer's code for ...
Python “extend” for a dictionary
What is the best way to extend a dictionary with another one while avoiding the use of a for loop? For instance:
7 Answer...
Rails: create on has_one association
...work. However there is a big difference between has_many relations and has_one relations:
With a has_many relation, shops returns an ActiveRecord collection object, which has methods that you can use to add and remove shops to/from a user. One of those methods is create, which creates a new shop an...
Using python map and other functional tools
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bad one when bars comes from the list
– Phyo Arkar Lwin
Nov 16 '12 at 13:14
59
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How can one pull the (private) data of one's own Android app?
...net/projects/adbextractor/files/?source=navbar
– Someone Somewhere
Jun 5 '14 at 0:25
3
Also, I no...
How to add 30 minutes to a JavaScript Date object?
..., 'm').toDate();
Vanilla Javascript
This is like chaos's answer, but in one line:
var newDateObj = new Date(oldDateObj.getTime() + diff*60000);
Where diff is the difference in minutes you want from oldDateObj's time. It can even be negative.
Or as a reusable function, if you need to do this i...
Proper way to wait for one function to finish before continuing?
I have two JS functions. One calls the other. Within the calling function, I'd like to call the other, wait for that function to finish, then continue on. So, for example/pseudo code:
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Lock, mutex, semaphore… what's the difference?
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A lock allows only one thread to enter the part that's locked and the lock is not shared with any other processes.
A mutex is the same as a lock but it can be system wide (shared by multiple processes).
A semaphore does the same as a mutex bu...