I started practicing from round 1 and now I have completed about 150 rounds. Of course I did not solve all of the problems since some of them are too difficult for me...

Although the tutorials are very good, however I feel that sometimes it might be still a little bit difficult for beginners, like me, to fully understand, especially for many div1 problems. On the other hand, as the problems are quite interesting and we can learn many clever ideas and techniques behind them, I think discussion helps a lot for obtaining deeper understanding.

Therefore, if anyone is also trying to solve problems one round after another, you are welcome to discuss problems with me, especially for those problems that I have submitted and got accepted (well, after all, I don't know how to solve those that I have never submitted...)

I would like to share any ideas or techniques involved in each problem that I have solved. Hope that every one could reach 'red' someday :D