I read that if you want to be specialist you should solve div2 A,B,C and div3 A,B,C,D maybe E, and if you solve this problems from past contests you can be specialist.Then I started to solve this problems but you can see from my history of contests I solve only A in div2 and A,B in div3 and div2 B problems that I tried to solve are difficult for me same thing with div 3 C what should I do ?? I wanted to solve problems from A2OJ div2 B and everyone saying that it's problems are very old.