Codeforces Round 388 (Div. 2) First at all, I want to complain about compiler! 
Same code for problem D, I tried on my PC and on ideone, it's all fine. But it got CE on Codeforces compiler, then I changed lang to G++14 6.1.0, it got passed. So I got 2 wrong submissions and that wasn't my fail.
But that's no the worst!
When system testing end, I got AC at A B C D. And while i'm waiting for rating change, I found that my codes were skipped, without a announcement or reason.
Seriously, I SOLVED PROBLEMS ON MY OWN! 
I'm looking forward to receiving feedback from pitfall and thank you in advance! GG!
