Problem 1933. That's some divisor you've got there...

Created by James

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?><w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Given a positive integer x, calculate the sum of all of the divisors of the number. Please include the number itself in your final answer. For example, 1, 3, 5 and 15 are all the proper divisors of 15, so sum_divisors(15)=1+3+5+15, which is 24.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/><w:jc w:val=\"left\"/></w:pPr><w:r><w:t>Your score will be based on how quickly your script solves the problems in the test suite, rather than the typical Cody size. Good luck!</w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Solve

Solution Stats

124 Solutions
25 Solvers

Last Solution submitted on Jul 19, 2021

Last 200 Solutions

Problem Comments

Solution Comments

Solution 1529308

5 Comments

5 Comments

Show 2 older comments

J. S. Kowontan on 15 May 2018

Brilliant, elegant and beautiful...truly pleasing to the eyes. This is what Cody is about. :). On a different note, Solution 1451618, with a size of 74, has an actual performance time of 4582 msec. While, this Solution has 8869 msec. But the problem states that 'Your score will be based on how quickly your script solves the problems in the test suite, rather than the typical Cody size.'. Any explanation on the actual scoring implementation, Bainhome?

bainhome on 15 May 2018

Your comment just a chainsaw on my brain...:), first, solutions on this problem's size really baffles me a while,because someone with far more better code skill than me provide lots of code longer than I expected, I am confused about that. Secondly, when I saw your sol.'s size is slightly bigger(which is extremely rare), I have this sneaky smile on my face and close the page as quick as possible. But now I know this problem is about operational efficiency, not size. I'm not in the mood again...:)

bainhome on 15 May 2018

But when we talk about operational efficiency, actual time that kinda stuff, I think Sol.1451618 is far more better. Vectoized code deal with large amount data "all at once", and for loop is "one by one", both of them have very different memory burden. and in this particular situation, i.e. very large number, factor... tradtional for loop has a significat advantage.
All above is purely assumption. Viewer discretion is advised.:)

James on 16 May 2018

Originally, this problem was scored by how quickly the code solved the problem. The Cody team changed the method of scoring at some point, so the method I used for setting the score proportional to the time spent solving the problem is no longer valid. There are a couple of other problems I have created that have the same issue.

J. S. Kowontan on 17 May 2018

Thanks James. Now I understand. :)

Solution 721102

1 Comment

1 Comment

Rafael S.T. Vieira on 2 Sep 2020

That's the fastest solution that I've found.

Problem Recent Solvers25

Problem Tags

addition divisors

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 1933. That's some divisor you've got there...

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers25

Suggested Problems

More from this Author80

Problem Tags

Community Treasure Hunt

Problem 1933. That's some divisor you've got there...

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers25

Suggested Problems

More from this Author80

Problem Tags

Community Treasure Hunt

Players