December Challenge 2013
Magic Pairs, Chef and Codes
November Challenge 2014
Chef and Segment Game, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome, The Spelling Problem
January Challenge 2015
Chef and A Large Permutation, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries
June Challenge 2015
Chef and Memory Limit, Chef and Polygons, Steady tables
February Challenge 2019 Division 2
Chef and Magical Jars, Chef and Secret Ingredients, Art of Balance, Deputy Chef
August Challenge 2019 Division 2
Guddu and his Mother, Dilemma, Football, Distribute Apples, Zombie and the Caves
November Challenge 2019 Division 2
Chef and Minimum Colouring
Canada