What functions/algorithms produce O(n^2) time complexity? [closed] - algorithm

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I'm learning about this in class and I'm really struggling to come up with any examples besides nested for loop. Can anyone share other known algorithms that have n^2 time complexity?

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J48 algorithm in weka algorithm or flowchart steps [closed]

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I am new in the machine learning area. please, I was wondering if you could provide me with algorithm or flowchart steps for J48.
note: I am using the default setting in weka.
thank you for your help.
J48 is based on Quinlan's C4.5.

What is this algorithm? [closed]

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I found this game and I'm very curious for know about of algorithm implemented in it.
I don't know how look for this, I don't know what is this algorithm and I want study it.
This is the game http://www.rustylake.com/puzzle-and-skill-games/coloruid.html
Really Thank you.
This seems like a basic "Flood Fill" algorithm.
It's performed on custom 'pixels', but the principle seems the same.

Algorithm to calculate the sum of a mathematical series [closed]

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Recently I came across a online tool, which given a summation calculates its formula. I have tried for many such summations and has given me correct answer.
I was curious as to which algorithm does it use to solve it.
EDIT: It turns out the tool uses wolframaplha api's. But even if you search on wolfram alpha you will get the same result.

How does tabling improve efficiency? [closed]

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I am curious about how tabling works to improve efficiency of Prolog programs. How is it implemented? Both explanation and references are welcome.

Implementation of Ruby arrays [closed]

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Python lists are implemented by CPython as amortized arrays. How are are Ruby arrays implemented, and for which implementations?
EDIT:
Partial answer here.

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