Spoj Time less And codechef more

I wrote the program for the problem http://www.codechef.com/problems/PALIN when i submitted it on codechef it showed time 2.18 seconds and when i submitted it on spoj it took only 0.35 seconds !! How is this possible

Code Chef Submission



Please explain

The reason could be that CodeChef uses Pyramid clusters of SPOJ, which are the old ones, whereas SPOJ uses Cube clusters, which they introduced a few years back.

Submissions on Cube run 30 to 50 times faster than Pyramid.

Source: http://www.spoj.com/clusters/

Codechef is using Cube since a while on live contests now :slight_smile:
But, on older practice problems, it’s true that those are still being judged on Pyramid hence the differences

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it might be because of different test cases in both the sites. The test cases codechef used might be bigger than spoj’s.

Ok, thanks!