You guys are amazing. I had a very big head start. Unfortunately, I move like a turtle in the past two one month or so. Finally, I decide to not follow the problem sequence and pick some easy problems from the later list, thus, I moved a little bit in the past week. Now, I am back to original problem sequence, try to do one problem per week, this way, I will catch the top guys at the end of the year (I hope).

The problems are getting harder, and sometimes not hard but require large memory. MATLAB is not the right tool for these problems and I am stuck many times. There's a couple of problems I have to use C.

I just put in a problem and I am now at 169. I hope I can get into the first page by the summer.