From where does i get the id required to participate in the contests ??
@bhumika_30 >> You’re already a registered member. For Codechef’s official contests (Long Challenge, Cook-off and Lunch Time every month) you can participate when the contests are live. For external contests, you might need to register on their website which is usually described on their main page.
For now, February Long Challenge is about to start on 7th Feb, 3pm IST onwards. Just login and go to Contests > February Challenge 2014 and then you will see the problems listed. Read the description and submit your solution. Good Luck!