Again its the Codeforces(cf) who nailed it. The contest conducted by cf are very frequent and really its a very good thing. I am almost there on every competitive programming site and found that cf is the best in conducting the contest. Thankful to all those guys who put there efforts in organizing this contests for us. It took a lot of effort to come up with a new question every time and gives us the opportunity to solve them. Once again thanks to all you guys.