alternative to eulerproject.net in regarding to computer science algorithms [closed] - algorithm

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On eulerproject.net the context is mainly related to mathematics.
Is there a website for practising (and solving) common issues of algorithms, which are non-mathematical?
I am talking about issues e.g. NP-hard problems or good strategies for efficient data handling (divide+conquer, dictionaries..).
Thanks for every helpful answer in advance.
Kind regards

Project Rosalind has a good selection of problems relating to bioinformatics algorithms.
Hackerrank has a choice of problems in categories including NP-complete, Dynamic programming, Graph theory.

you can find problems on topcoder
and there

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Reviewing Data Structures and Algorithms [closed]

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I was wondering if anyone had knew of a website that provides a great review of data structures and algorithms. I would like it to specifically geared towards interview questions with regards to data structures and algorithms. Would implementation of all of these data structures be something good to review?
Thanks!
This page is a good starting point:
This webpage covers the space and time Big-O complexities of common algorithms used in Computer Science. When preparing for technical interviews in the past, I found myself spending hours crawling the internet putting together the best, average, and worst case complexities for search and sorting algorithms so that I wouldn't be stumped when asked about them. Over the last few years, I've interviewed at several Silicon Valley startups, and also some bigger companies, like Yahoo, eBay, LinkedIn, and Google, and each time that I prepared for an interview, I thought to msyelf "Why oh why hasn't someone created a nice Big-O cheat sheet?". So, to save all of you fine folks a ton of time, I went ahead and created one.

Journal / Proceeding about comparing the similarity of 2 images? [closed]

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I am a newbie in Matlab field. And i want to learn more about methodology to comparing 2 images to know the similarity between them.
I need more information in international journal / international proceeding, book or another reprort that describe about it.
I Will use it as my literature study.
Is there any suggestion what is the similar journal,book or proceeding that has discussed about it? If has, please include the title and link of them..
Thank You for the attention.
For journals I would recommend the IEEE Transactions on Image Processing:
http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=83
This is a good general intro from MIT:
http://www.mit.edu/~ka21369/Imaging2012/tannenbaum.pdf
You need to define "similarity" better.
In the image compression sense, similarity is a function of the pixel-wise difference between the images (PSNR, and other metrics).
In a computer vision sense, you would want to see if the two images contain similar content such as objects or scenes. I would recommend using Google Scholar for that.

Ruby language cheatsheet/poster/reference/overview? [closed]

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I am a visual kind of guy and would like to know if there is somewhere a nice big overview of Ruby. You know, like a reference poster, with object hierarchy, most common methods, etc, all in color, layed out nice and clearly...
To a beginner like me would this would be awesome...
Is there something like that out there that you use or have stumbled upon?
Check these out :
https://github.com/savini/cheatsheets/raw/master/ruby/RubyCheat.pdf
http://wtr.rubyforge.org/s101/doc/Ruby-cheat-sheet.doc
http://refcardz.dzone.com/refcardz/essential-ruby#refcard-download-social-buttons-display
And a... "comparative" approach, with cheat sheets combined for major scripting languages :
http://hyperpolyglot.org/scripting

Creation of algorithms for web application [closed]

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I'm new to web programming. Where is the best place online can I find examples of algorithms created to solve specific problems ie. reputation system for a user controlled forum.
On my opinion a good introduction to this issue you can fing in this book:
Paperback: 336 pages
Publisher: Yahoo Press; 1 edition (March 16, 2010)
Language: English
ISBN-10: 059615979X
ISBN-13: 978-0596159795
Table of Contents:
Part I. Reputation Defined and Illustrated
Reputation Systems Are Everywhere
A (Graphical) Grammar for Reputation
Part II. Extended Elements and Applied Examples
Building Blocks and Reputation Tips
Common Reputation Models
Planning Your System’s Design
Objects, Inputs, Scope, and Mechanism
Displaying Reputation
Using Reputation: The Good, The Bad, and the Ugly
Application Integration, Testing, and Tuning
Case Study: Yahoo! Answers Community Content Moderation
Here you can buy it: http://www.amazon.com/Building-Reputation-Systems-Randy-Farmer/dp/059615979X

Software for creating data structure diagrams? [closed]

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What's a good (preferably free) software tool for creating data structure diagrams? For example, something like this:
GraphViz may suit you.
Inkscape takes a bit of learning, but is quite good for this.
A simpler program is Dia

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