December Challenge 2014
XOR with Subset, Chef and Apple Trees, Alok-nath and His Sanskars
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 Strange Formula, Chef and Equality, Let us play with rank list, Chef and Strings, Chef and Chain
July Challenge 2016
Andrash and Stipendium, Chefland and Electricity
August Challenge 2016
Chef and Circle Run, Chef and Chocolate, Chef and Round Run
India