there is his code : http://codeforces.me/contest/610/submission/15050289
As we can see:

He get accepted.
But his code wa2.

Maybe this is a Christmas presents?
lol
I find a bug.
there is his code : http://codeforces.me/contest/610/submission/15050289
As we can see:

He get accepted.
But his code wa2.

Maybe this is a Christmas presents?
lol