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What is the significance of initializing direction arrays below with given values when developing ch

I am new to competitive programming, and I noticed frequently, many of the great coders have these four lines in their code (particularly in those involving arrays): ...
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How does the C code that prints from 1 to 1000 without loops or conditional statements work?

...prints from 1 to 1000 without loops or conditionals : But I don't understand how it works. Can anyone go through the code and explain each line? ...
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SQL JOIN and different types of JOINs

What is a SQL JOIN and what are different types? 6 Answers 6 ...
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CPU Privilege Rings: Why rings 1 and 2 aren't used?

...the modern protection model) only has a concept of privileged (ring 0,1,2) and unprivileged, the benefit to rings 1 and 2 were diminished greatly. The intent by Intel in having rings 1 and 2 is for the OS to put device drivers at that level, so they are privileged, but somewhat separated from the r...
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Fast permutation -> number -> permutation mapping algorithms

...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 numbers. As an example for n = 5, consid...
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What values should I use for CFBundleVersion and CFBundleShortVersionString?

This is my first iOS app submission and I don't want my app rejected. 7 Answers 7 ...
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“Conversion to Dalvik format failed with error 1” on external JAR

In my Android application in Eclipse I get the following error. 71 Answers 71 ...
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Delete topic in Kafka 0.8.1.1

... Thanks for the info. Do you know how to clear the entire Kafka and Zookeeper states as indicated? – EmPak5 Jun 18 '14 at 16:09 ...
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When should I use cross apply over inner join?

...NER JOIN condition. You could probably do something like that using CTE's and window function: WITH t2o AS ( SELECT t2.*, ROW_NUMBER() OVER (PARTITION BY t1_id ORDER BY rank) AS rn FROM t2 ) SELECT t1.*, t2o.* FROM t1 INNER JOIN t2o ON t2o.t1...
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NumPy: function for simultaneous max() and min()

numpy.amax() will find the max value in an array, and numpy.amin() does the same for the min value. If I want to find both max and min, I have to call both functions, which requires passing over the (very big) array twice, which seems slow. ...