Can anyone help me to identify where I am wrong for the problem : http://codeforces.com/contest/747/problem/C

here is my solution which fails on the test case 9. I am unable to identify the mistake.

http://codeforces.com/contest/747/submission/25716217

Thank you.

http://codeforces.com/contest/749/submission/25673548

I get this error on one test case. My program runs properly on the local machine. Then I submitted this code which worked perfectly

http://codeforces.com/contest/749/submission/25673595

What is the reason for this error?

Thank you.