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Kees Roos

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Company/University

TU Delft

746Rank
3Badges
440Score

Kees Roos liked Solution 86663

on 8 May 2012

Kees Roos submitted a Comment to Solution 86663

After many efforts, on my PC the time for 1000 vertices and 12000 arcs is now less than 1 sec. My solution is a variant of Dijkstra's algorithm. In fact, it surprises me that all shortest paths can be found so fast. I now stop trying to improve my code. After this solution I could see the leading-time solution which is quite different. Very nice!

on 8 May 2012

Kees Roos submitted a Comment to Solution 84550

Dear Alfonso, thanks for doing this! Size now refers to msec's? I will now try to improve my code. Is there a way to reproduce the new size on my PC?

on 2 May 2012

Kees Roos submitted Solution 84046 to Problem 167. Pizza!

on 30 Apr 2012

Kees Roos submitted a Comment to Solution 84030

When I run test problem 5 with my code on my PC the output is Time (ms) 1.0e+04 * 0.006900000000000 0.657700000000000 1.714100000000000 In total this is well below 20 sec. It may be not the leading time, but it is kind of frustratng that the response of Cody is that the "server encountered an error". There is no error in the code; I am sure because I compared my solutions with those obtained by using the 'graphallshortestpaths.m' routine in the Bioinformatics toolbox of Matlab. I would like to know why I get no valid response from Cody.

on 30 Apr 2012

Kees Roos submitted a Comment to Solution 81313

Currently my code needs about 12 seconds for finding all shortest paths if the number of nodes is 1000 and the number of arcs 12000. Of course, I verified that the code is correct. But since I have no entrance to the last test problem, it is not clear why the server is not able to handle it. At least, I would be glad to be able to compare 'my' times with the leadng time.

on 25 Apr 2012

Kees Roos liked Solution 78770

on 18 Apr 2012

Kees Roos received Promoter badge for Solution 78770

on 18 Apr 2012

Kees Roos submitted a Comment to Solution 76528

I now understand. It is a pity that the Cody system does not report that the smaller problems are solved correctly. I guess the results you mention for large networks can be obtained only by commercial codes. I tried the code in the Bioinformatic toolbox. This would work, but needs a license.

on 17 Apr 2012

Kees Roos submitted Solution 77590 to Problem 76. De-dupe

on 17 Apr 2012

Kees Roos submitted Solution 77101 to Problem 48. Making change

on 16 Apr 2012

Kees Roos submitted Solution 77044 to Problem 151. Magic!

on 16 Apr 2012