If you are new to competitive programming, we would recommend you to solve the least difficult problems first and gradually go up the order. You can try your hand by solving problems from our beginner section here:
https://www.codechef.com/problems/school

If you are new to CodeChef, go through our getting started page here:
https://www.codechef.com/getting-started

SnackDown 2015

• Round 1A:https://www.codechef.com/tags/problems/snck151a
• Round 1B:https://www.codechef.com/tags/problems/snck151b
• Round 1C:https://www.codechef.com/tags/problems/snck151c
• SnackDown 2015 Elimination:https://www.codechef.com/tags/problems/snck15el
• SnackDown 2015 Finals:https://www.codechef.com/tags/problems/snck15fl

SnackDown 2010

• SnackDown 2010 Test:https://www.codechef.com/tags/problems/snacktst
• CodeChef Campus SnackDown 2010:https://www.codechef.com/tags/problems/snackdwn
• CodeChef Campus ReSnackDown:https://www.codechef.com/tags/problems/resnkdwn
• SnackDown Onsite Final:https://www.codechef.com/tags/problems/snonsite