Hey!!! i am solving problem in codeforces since last month and in codechef since a year. I am solve to solve 2 to 3 questions in codechef and codeforces in every contest. I observe starting 1 to 2 questions are maths in codeforces and 1 to 4 questions in codechef are based on mathematics... I am always get stuck in question number 3 in codechef and codeforces... I need help and suggestion what are the mathematics topics i should read and how can i improve my skills from this level... Thank you !!!