http://www.codechef.com/April12/problems/PDSNUM/ how we can solve these kind of problem's using greedy approach.I am not able to understand these kind of problems please help. http://community.topcoder.com/stat?c=problem_statement&pm=12045&rd=14738
June http://www.codechef.com/JUNE12/problems/LUCKY8
May (somewhat similar) http://www.codechef.com/MAY12/problems/DIGFORST
April http://www.codechef.com/APRIL12/problems/PDSNUMhttp://www.codechef.com/APRIL12/problems/LUCKY4
March http://www.codechef.com/MARCH12/problems/LUCKY2
i got this list from topcoder