I've tried to submit this problem : https://mirror.codeforces.com/contest/2131/problem/F

On first submission, I got wrong answer on test case 2

https://mirror.codeforces.com/contest/2131/submission/333744450

I just copied the test case and run on my local and it got the correct answer

After that, I submit another solution with fill sum[i] = sumDiff[i] = 0 and got wrong on test 4

https://mirror.codeforces.com/contest/2131/submission/333745044

And after that, I copied this code and resubmit again, and it got wrong on test 2

Is there a problem with the judge system ?