I searched about it, and somehow I found out this problem had the same problem 2 years ago and got fixed. But unfortunately, it just happened again!. As you can see in the picture, I submit it successfully last year, and my friend asked me about the "denial of judgement thingy" I didn't even know what that is, my first time too. :) Please fix it!
Thank you, Mike Mirzayanov. I really admire your work, my programming skill got enhanced a lots when I started coding on your website. :D http://codeforces.com/predownloaded/6e/d3/6ed376d20157ebb7951a1c937e11e02e045e28eb.png