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Fast permutation -> number -> permutation mapping algorithms
...sition that the first element ends up at, you have n possibilities, so you can describe this with a number between 0 and n-1. For the position that the next element ends up at, you have n-1 remaining possibilities, so you can describe this with a number between 0 and n-2.
Et cetera until you have n ...
Differences and relationship between glActiveTexture and glBindTexture
...ather, glActiveTexture sets the active "texture unit". Each texture unit can have multiple texture targets (usually GL_TEXTURE_1D, 2D, 3D or CUBE_MAP).
...
Possible to do a MySQL foreign key to one of two possible tables?
...e's my problem I have three tables; regions, countries, states. Countries can be inside of regions, states can be inside of regions. Regions are the top of the food chain.
...
Map Tiling Algorithm
...found in the first square. This means that there in total are 12 different cases we must distinguish between.
Now, looking at one edge tile we can determine which way the boundary turns by looking at its four closest neighbour tiles. Marking an edge tile with X just as above we have the following s...
How would Git handle a SHA-1 collision on a blob?
...
I did an experiment to find out exactly how Git would behave in this case. This is with version 2.7.9~rc0+next.20151210 (Debian version). I basically just reduced the hash size from 160-bit to 4-bit by applying the following diff and rebuilding git:
--- git-2.7.0~rc0+next.20151210.orig/block-...
Daylight saving time and time zone best practices [closed]
...nown as Zulu or Z time.)
If instead you choose to persist a time using a local time value, include the local time offset for this particular time from UTC (this offset may change throughout the year), such that the timestamp can later be interpreted unambiguously.
In some cases, you may need to sto...
What is state-of-the-art for text rendering in OpenGL as of version 4.1? [closed]
...y different ballpark. The results are truly stunning, it is as fast as you can get, and effects such as glow are trivially easy to add, too. Also, the technique can be downgraded nicely to older hardware, if needed.
See the famous Valve paper for the technique.
The technique is conceptually simila...
What would cause an algorithm to have O(log n) complexity?
... from? However, it turns out that there's several different ways that you can get a log term to show up in big-O notation. Here are a few:
Repeatedly dividing by a constant
Take any number n; say, 16. How many times can you divide n by two before you get a number less than or equal to one? For...
Callback functions in C++
In C++, when and how do you use a callback function?
10 Answers
10
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Unicode equivalents for \w and \b in Java regular expressions?
...ain. It’s available as an embeddable (?U) for inside the pattern, so you can use it with the String class’s wrappers, too. It also sports corrected definitions for various other properties, too. It now tracks The Unicode Standard, in both RL1.2 and RL1.2a from UTS#18: Unicode Regular Expressio...