Hello!

My submission is getting WA on test 21, since there's no editorial I can't see the desired solution and I can't figure out where my mistake is.

Here is the link : http://codeforces.me/contest/279/submission/20043264

Thanks for help!

Hello,

How can I motivate myself to solve algorithmic problems outside of CF rounds? I used to work pretty hard to achieve my level, and now I try to take part in every CF round I can, but I'm not working on tasks outside of that. If I know a problem has a listed solution somewhere I give up after a while, or even when I get the solution right I don't code it. Similarly I know the ideas behind algorithms and structures I have never written, so even if I notice the pattern I'm stuck. How do you "fight" with issues like that? :)

Thanks in advance