November Challenge 2014
Distinct Characters Subsequence, Let us construct palindrome, Chef and Segment Game
January Challenge 2015
Sereja and Number Division 2, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries
February Challenge 2015
Chef and Strange Formula, Chef and Equality, Jigsaw Puzzle Solving, Let us play with rank list, Chef and Strings, Chef and Complex String Coverage, Time to Study Graphs with Chef, Chef and Chain
March Challenge 2015
Count Substrings, Chef and Notebooks, Sign Wave
April Challenge 2015
Division of Lands, Chef and Piano Scales, Inversion sorting, Chef and Interview, Count Sequences, Broken Telephone
February Cook-Off 2015
Fit Squares in Triangle, Strategy for the World Cup
March Cook-Off 2015
How to Minimize a String, How to Repaint a Fence
May Cook-Off 2015
Devu, his friends and birthday gifts, Devu and friendship testing, Devu and decorating birthday cake
July Cook-Off 2015
Cops and the Thief Devu, Maximize Disjoint Pair Sum
June Challenge 2017
A Good Set, Triplets, Xenny and Coin Rankings, Chef and the Feast
September Cook-Off 2017
Numbers Game, Infinite OR Game, Statistics Construction, Subsequence Equality
October Cook-Off 2017
Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries
India