December Challenge 2014
Chef and Apple Trees, XOR with Subset
January Challenge 2015
Sereja and Number Division 2, Chef and A Large Permutation, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries
February Challenge 2015
Chef and Chain, Let us play with rank list, Chef and Equality
April Challenge 2015
Chef and Interview, Broken Telephone, Chef and Piano Scales
May Challenge 2015
Chef and Prime Divisors, Set Difference , Chef and new recipe
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix
October Challenge 2015
Who dares to be a millionaire
May Cook-Off 2015
Devu and friendship testing
September Lunchtime 2015
Sum of palindromic numbers
India