November Challenge 2014
Chef and Segment Game, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome
December Challenge 2014
Alok-nath and His Sanskars, Chef and Apple Trees
January Challenge 2015
Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries
February Challenge 2015
Let us play with rank list, Chef and Equality, Chef and Chain
April Challenge 2015
Chef and Interview, Broken Telephone
August Challenge 2015
Way Out, Gravity Guy, Cooking Machine
September Challenge 2015
Chain of Doughnuts, Count Steps in Matrix
October Challenge 2015
Count Subarrays, Who dares to be a millionaire
September Mega Cook-Off 2015
Forgotten Language, Stacks
Vietnam