January Challenge 2015
Sereja and Number Division 2, Chef and A Large Permutation, Sereja and LCM, One Dimensional Kingdoms, Queries on the String
February Challenge 2015
Chef and Chain, Chef and Strange Formula, Chef and Strings, Let us play with rank list, Chef and Equality
April Challenge 2015
Chef and Piano Scales, Broken Telephone, Chef and Interview
May Challenge 2015
Devu and his three Hands, Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe
April Cook-Off 2015
Lucky Fives, Equality, Version Control System
May Cook-Off 2015
Devu and friendship testing, Devu and decorating birthday cake
