Hello everybody,

I'm trying to solve this problem. But I don't have any ideas. Can someone help me, pls ?

Thanks!

UPD: I solved it :-)

I think mnlfrnnds04 (Who got 44 Successful hacking attempt) tried to hack his submission (using another user account) http://www.codeforces.com/contest/244/submission/2573465

You can see another submissions: http://www.codeforces.com/contest/244/submission/2573346 http://www.codeforces.com/contest/244/submission/2573196 ...