Hi, I'm working on problem [296C](https://codeforces.com/contest/296/problem/C) and I am trying to solve it using a BIT. However, I keep getting WA on test 11. I've tried examplmy own test cases but could not find the problem in my code. Here is my submission: [211297450](https://codeforces.com/contest/296/submission/211297450). Could someone help me find it? Thank you!