January Challenge 2015
Chef and Stones, Sereja and Votes
April Challenge 2015
Chef and Piano Scales, Broken Telephone, Chef and Interview
August Challenge 2015
Gravity Guy, Cooking Machine, Aditi and Magic Trick
October Challenge 2015
Time measure, Rupsa and Equilateral Triangle, Who dares to be a millionaire, Count Subarrays
April Cook-Off 2015
Equality, Version Control System
August Cook-Off 2015
Chef and the XORed Number , Chef and the Wildcard Matching
September Lunchtime 2015
Sum of palindromic numbers
India