I have been stuck between two divisions for the last 20 contests I've participated. Basicly , when I fall in div2 , I get back in div1 , but not pass the purple color. I am kind of disappointed of myself , so I decided to make a change and train harder than I ever did.

So in the next 30 days ( 30/7 — 28/8 ) I will solve 150 div1 problems. If someone is willing to take the same challenge , I've made a group.