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What is better, adjacency lists or adjacency matrices for graph problems in C++?
...depends on the problem.
Adjacency Matrix
Uses O(n^2) memory
It is fast to lookup and check for presence or absence of a specific edge
between any two nodes O(1)
It is slow to iterate over all edges
It is slow to add/delete a node; a complex operation O(n^2)
It is fast to add a new edge O(1)
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How to change the session timeout in PHP?
I would like to extend the session timeout in php
7 Answers
7
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What are the differences between Generics in C# and Java… and Templates in C++? [closed]
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I'll add my voice to the noise and take a stab at making things clear:
C# Generics allow you to declare something like this.
List<Person> foo = new List<Person>();
and then the compiler will prevent you from putting things that ar...
Creating runnable JAR with Gradle
...le JAR files via the Eclipse "Export..." functionallity but now I switched to IntelliJ IDEA and Gradle for build automation.
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How do I dump an object's fields to the console?
When I'm running a simple Ruby script, what's the easiest way to dump an object's fields to the console?
9 Answers
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Mac OS X - EnvironmentError: mysql_config not found
...did all those steps in the same order, and you still got an error, read on to the end, if, however, you did not follow these exact steps try, following them from the very beginning.
So, you followed the steps, and you're still geting an error, well, there are a few things you could try:
Try runni...
What does SynchronizationContext do?
...sents a location "where" code might be executed. Delegates that are passed to its Send or Post method will then be invoked in that location. (Post is the non-blocking / asynchronous version of Send.)
Every thread can have a SynchronizationContext instance associated with it. The running thread can b...
Keep only date part when using pandas.to_datetime
I use pandas.to_datetime to parse the dates in my data. Pandas by default represents the dates with datetime64[ns] even though the dates are all daily only.
I wonder whether there is an elegant/clever way to convert the dates to datetime.date or datetime64[D] so that, when I write the data t...
Image fingerprint to compare similarity of many images
I need to create fingerprints of many images (about 100.000 existing, 1000 new per day, RGB, JPEG, max size 800x800) to compare every image to every other image very fast. I can't use binary compare methods because also images which are nearly similar should be recognized.
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Why does Twitter Bootstrap Use Pixels for Font Size?
Given that Twitter Bootstrap is designed to be responsive / device-friendly, why doesn't it use relative font sizes?
5 Answ...