Yesterday I was submitted the problem B in the contest time and it was pretest passed. But after finishing the contest it got the wrong answer on test 15. But its output is correct in my laptop compiler. then same code i submitted again then it got the wrong answer on test 37 though it gave correct output .again i submitted code removing space but it WA on test 2.In my own laptop, it is given correctly for all test. What's the wrong with me ??

My Submission :http://codeforces.net/submissions/Hredoy_Biswas